Legacy launcher can no longer start Minecraft
A new version of the legacy launcher has been released that solves this issue. If your launcher does not automatically update, you can download the updated version (1.6.93) here.
If you're able to launch the updated launcher (2.x.x), it is recommended to update to this one instead. You can find the download links for it here. If you're not able to launch the 2.x.x launcher, please create a new ticket about that.
You find the workaround for this issue that could be used before it was fixed below. It is recommended to use the updated launcher (legacy or not) instead of using the workaround below.
This is an error that occurs only when launching 1.14.4, 19w36a, or versions that have been released after 19w36a. It happens because the legacy launcher does seem to have problems with downloading and installing the newer version files.
To work around this issue, you can install versions you want to play manually. This is a rather tedious task. If you can use the updated launcher, or a third party launcher (such as MultiMC), you might want to use those. (Beware of pirated third-party launchers though, they might steal your login data.)
How to install a version manually
- Close the launcher.
- Visit the version page of the version you want to play on the official Minecraft Wiki.
- On the top right of the page, you'll see a box with some informations about the version. Here, you find links to download the version files directly from Mojang's servers. Click the "Download → Client" and "Download → .json" links to download a client.jar file, and a <version>.json file.
- Navigate to your .minecraft folder.
- Navigate into the folder versions.
- Create a new folder. You may choose a custom name, but not the name of any vanilla version. For instance, I would recommend to use 1.14.4-fix if you want to install 1.14.4.
- Copy the client.jar file into the folder you just created and rename it so that it has the same name as the folder. For instance, for 1.14.4, that would be 1.14.4-fix.jar.
- Copy the <version>.json file you downloaded in that folder as well, and rename it so that it has the same name. For instance, for 1.14.4, that would be 1.14.4-fix.json.
- Open the .json file in a text editor of your choice.
- Edit the "id": "<version>" field so that it now has the same name as you gave the version, for instance "id": "1.14.4-fix".
- Delete the first downloads object ("downloads", and everything inside of the curly braces behind).
- Save the file and close it.
- Open the launcher.
- Edit your launcher profile and select the version you just installed, for instance 1.14.4-fix.
Happy mining and crafting!
If you have trouble following these steps above, please do not comment on this ticket. Instead, I've opened a thread on Reddit if you need support.
I'm aware that this workaround is very tedious and hard to follow, but it's the only one that is found to work on computers that can't use the new launcher as of now.
I use the old Java launcher because the new one does not work on my Linux distribution. Yesterday afternoon, the launcher suddenly refused to start up Minecraft 1.14.4. The launcher continues to work with all earlier versions of Minecraft, and was working with Minecraft 1.14.4 only yesterday morning.
When I press the "Play" button I see the message "Preparing...", and nothing else happens. In the launcher log, I see a stack trace as follows:
[12:58:00 INFO]: Queueing library & version downloads [12:58:00 FATAL]: Unhandled exception in thread Thread[pool-2-thread-2,5,main] com.google.gson.JsonSyntaxException: duplicate key: null at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:191) ~[Minecraft.jar:?] at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:146) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:795) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:761) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:710) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:682) ~[Minecraft.jar:?] at net.minecraft.launcher.updater.RemoteVersionList.getCompleteVersion(RemoteVersionList.java:32) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:213) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:37) ~[launcher.jar:1.6.89-j] at com.mojang.launcher.game.runner.AbstractGameRunner.playGame(AbstractGameRunner.java:67) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.game.GameLaunchDispatcher$1.run(GameLaunchDispatcher.java:111) ~[launcher.jar:1.6.89-j] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_131] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_131] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]
I suspect some corrupted data in a json file, but which file, and how can I fix this? I have tried deleting the 1.14.4 jar files, but to no avail.
Environment
[12:57:50 INFO]: Minecraft Launcher 1.6.89-j (through bootstrap 5) started on linux...
[12:57:50 INFO]: Current time is Sep 5, 2019 12:57:50 PM
[12:57:50 INFO]: System.getProperty('os.name') == 'Linux'
[12:57:50 INFO]: System.getProperty('os.version') == '4.9.0-0.bpo.2-amd64'
[12:57:50 INFO]: System.getProperty('os.arch') == 'amd64'
[12:57:50 INFO]: System.getProperty('java.version') == '1.8.0_131'
[12:57:50 INFO]: System.getProperty('java.vendor') == 'Oracle Corporation'
[12:57:50 INFO]: System.getProperty('sun.arch.data.model') == '64'
Linked Issues
is duplicated by9
MC-1605661.14DuplicateMC-160624duplicate key: nullDuplicateMC-161146unhadled exception in java launcherDuplicateMC-162210All versions from and including 1.14.4 throws an exception, except snapshot 19w34a and 19w35aDuplicateMC-180702The Java launcher keeps running into the same issue and won't allow me to launch it.DuplicateMC-194778Free/GhostBSD - Minecraft 1.13 and all versions above won't launch.DuplicateMC-194780Is Minecraft for FreeBSD considered pirated?Duplicate
MCL-11994Stuck on preparingDuplicateMCL-11997I can't start Minecraft (1.14.4) launcher 1.6.89-jDuplicate
Created Issue:
Error in Java Launcher 1.6.89-j with Minecraft 1.14.4
I use the old Java launcher because the new one does not work on my Linux distribution. Yesterday afternoon, the launcher suddenly refused to start up Minecraft 1.14.4. The launcher continues to work with all earlier versions of Minecraft, and was working with Minecraft 1.14.4 only yesterday morning.
In the launcher log, I see a stack trace as follows:
[12:58:00 INFO]: Queueing library & version downloads
[12:58:00 FATAL]: Unhandled exception in thread Thread[pool-2-thread-2,5,main]
com.google.gson.JsonSyntaxException: duplicate key: null
{{ at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:191) ~[Minecraft.jar:?]}}
{{ at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:146) ~[Minecraft.jar:?]}}
{{ at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) ~[Minecraft.jar:?]}}
{{ at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) ~[Minecraft.jar:?]}}
{{ at com.google.gson.Gson.fromJson(Gson.java:795) ~[Minecraft.jar:?]}}
{{ at com.google.gson.Gson.fromJson(Gson.java:761) ~[Minecraft.jar:?]}}
{{ at com.google.gson.Gson.fromJson(Gson.java:710) ~[Minecraft.jar:?]}}
{{ at com.google.gson.Gson.fromJson(Gson.java:682) ~[Minecraft.jar:?]}}
{{ at net.minecraft.launcher.updater.RemoteVersionList.getCompleteVersion(RemoteVersionList.java:32) ~[launcher.jar:1.6.89-j]}}
{{ at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:213) ~[launcher.jar:1.6.89-j]}}
{{ at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:37) ~[launcher.jar:1.6.89-j]}}
{{ at com.mojang.launcher.game.runner.AbstractGameRunner.playGame(AbstractGameRunner.java:67) ~[launcher.jar:1.6.89-j]}}
{{ at net.minecraft.launcher.game.GameLaunchDispatcher$1.run(GameLaunchDispatcher.java:111) ~[launcher.jar:1.6.89-j]}}
{{ at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_131]}}
{{ at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_131]}}
{{ at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]}}I suspect some corrupted data in a json file, but which file, and how can I fix this?
Environment
[12:57:50 INFO]: Minecraft Launcher 1.6.89-j (through bootstrap 5) started on linux...
[12:57:50 INFO]: Current time is Sep 5, 2019 12:57:50 PM
[12:57:50 INFO]: System.getProperty('os.name') == 'Linux'
[12:57:50 INFO]: System.getProperty('os.version') == '4.9.0-0.bpo.2-amd64'
[12:57:50 INFO]: System.getProperty('os.arch') == 'amd64'
[12:57:50 INFO]: System.getProperty('java.version') == '1.8.0_131'
[12:57:50 INFO]: System.getProperty('java.vendor') == 'Oracle Corporation'
[12:57:50 INFO]: System.getProperty('sun.arch.data.model') == '64'
I use the old Java launcher because the new one does not work on my Linux distribution. Yesterday afternoon, the launcher suddenly refused to start up Minecraft 1.14.4. The launcher continues to work with all earlier versions of Minecraft, and was working with Minecraft 1.14.4 only yesterday morning.
In the launcher log, I see a stack trace as follows:
[12:58:00 INFO]: Queueing library & version downloads
[12:58:00 FATAL]: Unhandled exception in thread Thread[pool-2-thread-2,5,main]
com.google.gson.JsonSyntaxException: duplicate key: null
{{ at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:191) ~[Minecraft.jar:?]}}
{{ at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:146) ~[Minecraft.jar:?]}}
{{ at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) ~[Minecraft.jar:?]}}
{{ at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) ~[Minecraft.jar:?]}}
{{ at com.google.gson.Gson.fromJson(Gson.java:795) ~[Minecraft.jar:?]}}
{{ at com.google.gson.Gson.fromJson(Gson.java:761) ~[Minecraft.jar:?]}}
{{ at com.google.gson.Gson.fromJson(Gson.java:710) ~[Minecraft.jar:?]}}
{{ at com.google.gson.Gson.fromJson(Gson.java:682) ~[Minecraft.jar:?]}}
{{ at net.minecraft.launcher.updater.RemoteVersionList.getCompleteVersion(RemoteVersionList.java:32) ~[launcher.jar:1.6.89-j]}}
{{ at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:213) ~[launcher.jar:1.6.89-j]}}
{{ at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:37) ~[launcher.jar:1.6.89-j]}}
{{ at com.mojang.launcher.game.runner.AbstractGameRunner.playGame(AbstractGameRunner.java:67) ~[launcher.jar:1.6.89-j]}}
{{ at net.minecraft.launcher.game.GameLaunchDispatcher$1.run(GameLaunchDispatcher.java:111) ~[launcher.jar:1.6.89-j]}}
{{ at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_131]}}
{{ at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_131]}}
{{ at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]}}I suspect some corrupted data in a json file, but which file, and how can I fix this? I have tried deleting the 1.14.4 jar files, but to no avail.
I use the old Java launcher because the new one does not work on my Linux distribution. Yesterday afternoon, the launcher suddenly refused to start up Minecraft 1.14.4. The launcher continues to work with all earlier versions of Minecraft, and was working with Minecraft 1.14.4 only yesterday morning.
In the launcher log, I see a stack trace as follows:
[12:58:00 INFO]: Queueing library & version downloads
[12:58:00 FATAL]: Unhandled exception in thread Thread[pool-2-thread-2,5,main]
com.google.gson.JsonSyntaxException: duplicate key: null
{{ at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:191) ~[Minecraft.jar:?]}}
{{ at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:146) ~[Minecraft.jar:?]}}
{{ at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) ~[Minecraft.jar:?]}}
{{ at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) ~[Minecraft.jar:?]}}
{{ at com.google.gson.Gson.fromJson(Gson.java:795) ~[Minecraft.jar:?]}}
{{ at com.google.gson.Gson.fromJson(Gson.java:761) ~[Minecraft.jar:?]}}
{{ at com.google.gson.Gson.fromJson(Gson.java:710) ~[Minecraft.jar:?]}}
{{ at com.google.gson.Gson.fromJson(Gson.java:682) ~[Minecraft.jar:?]}}
{{ at net.minecraft.launcher.updater.RemoteVersionList.getCompleteVersion(RemoteVersionList.java:32) ~[launcher.jar:1.6.89-j]}}
{{ at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:213) ~[launcher.jar:1.6.89-j]}}
{{ at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:37) ~[launcher.jar:1.6.89-j]}}
{{ at com.mojang.launcher.game.runner.AbstractGameRunner.playGame(AbstractGameRunner.java:67) ~[launcher.jar:1.6.89-j]}}
{{ at net.minecraft.launcher.game.GameLaunchDispatcher$1.run(GameLaunchDispatcher.java:111) ~[launcher.jar:1.6.89-j]}}
{{ at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_131]}}
{{ at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_131]}}
{{ at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]}}I suspect some corrupted data in a json file, but which file, and how can I fix this? I have tried deleting the 1.14.4 jar files, but to no avail.
I use the old Java launcher because the new one does not work on my Linux distribution. Yesterday afternoon, the launcher suddenly refused to start up Minecraft 1.14.4. The launcher continues to work with all earlier versions of Minecraft, and was working with Minecraft 1.14.4 only yesterday morning.
In the launcher log, I see a stack trace as follows:
[12:58:00 INFO]: Queueing library & version downloads
[12:58:00 FATAL]: Unhandled exception in thread Thread[pool-2-thread-2,5,main]
com.google.gson.JsonSyntaxException: duplicate key: null
{{ at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:191) ~[Minecraft.jar:?]}}
{{ at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:146) ~[Minecraft.jar:?]}}
{{ at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) ~[Minecraft.jar:?]}}
{{ at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) ~[Minecraft.jar:?]}}
{{ at com.google.gson.Gson.fromJson(Gson.java:795) ~[Minecraft.jar:?]}}
{{ at com.google.gson.Gson.fromJson(Gson.java:761) ~[Minecraft.jar:?]}}
{{ at com.google.gson.Gson.fromJson(Gson.java:710) ~[Minecraft.jar:?]}}
{{ at com.google.gson.Gson.fromJson(Gson.java:682) ~[Minecraft.jar:?]}}
{{ at net.minecraft.launcher.updater.RemoteVersionList.getCompleteVersion(RemoteVersionList.java:32) ~[launcher.jar:1.6.89-j]}}
{{ at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:213) ~[launcher.jar:1.6.89-j]}}
{{ at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:37) ~[launcher.jar:1.6.89-j]}}
{{ at com.mojang.launcher.game.runner.AbstractGameRunner.playGame(AbstractGameRunner.java:67) ~[launcher.jar:1.6.89-j]}}
{{ at net.minecraft.launcher.game.GameLaunchDispatcher$1.run(GameLaunchDispatcher.java:111) ~[launcher.jar:1.6.89-j]}}
{{ at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_131]}}
{{ at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_131]}}
{{ at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]}}I suspect some corrupted data in a json file, but which file, and how can I fix this? I have tried deleting the 1.14.4 jar files, but to no avail.
![[Mod] violine1101](../../../data/avatars/users/92858.png){kind=small}
MC-160555 → MCL-11993I use the old Java launcher because the new one does not work on my Linux distribution. Yesterday afternoon, the launcher suddenly refused to start up Minecraft 1.14.4. The launcher continues to work with all earlier versions of Minecraft, and was working with Minecraft 1.14.4 only yesterday morning.
In the launcher log, I see a stack trace as follows:
[12:58:00 INFO]: Queueing library & version downloads
[12:58:00 FATAL]: Unhandled exception in thread Thread[pool-2-thread-2,5,main]
com.google.gson.JsonSyntaxException: duplicate key: null
{{ at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:191) ~[Minecraft.jar:?]}}
{{ at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:146) ~[Minecraft.jar:?]}}
{{ at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) ~[Minecraft.jar:?]}}
{{ at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) ~[Minecraft.jar:?]}}
{{ at com.google.gson.Gson.fromJson(Gson.java:795) ~[Minecraft.jar:?]}}
{{ at com.google.gson.Gson.fromJson(Gson.java:761) ~[Minecraft.jar:?]}}
{{ at com.google.gson.Gson.fromJson(Gson.java:710) ~[Minecraft.jar:?]}}
{{ at com.google.gson.Gson.fromJson(Gson.java:682) ~[Minecraft.jar:?]}}
{{ at net.minecraft.launcher.updater.RemoteVersionList.getCompleteVersion(RemoteVersionList.java:32) ~[launcher.jar:1.6.89-j]}}
{{ at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:213) ~[launcher.jar:1.6.89-j]}}
{{ at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:37) ~[launcher.jar:1.6.89-j]}}
{{ at com.mojang.launcher.game.runner.AbstractGameRunner.playGame(AbstractGameRunner.java:67) ~[launcher.jar:1.6.89-j]}}
{{ at net.minecraft.launcher.game.GameLaunchDispatcher$1.run(GameLaunchDispatcher.java:111) ~[launcher.jar:1.6.89-j]}}
{{ at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_131]}}
{{ at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_131]}}
{{ at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]}}I suspect some corrupted data in a json file, but which file, and how can I fix this? I have tried deleting the 1.14.4 jar files, but to no avail.
I use the old Java launcher because the new one does not work on my Linux distribution. Yesterday afternoon, the launcher suddenly refused to start up Minecraft 1.14.4. The launcher continues to work with all earlier versions of Minecraft, and was working with Minecraft 1.14.4 only yesterday morning.
In the launcher log, I see a stack trace as follows:
[12:58:00 INFO]: Queueing library & version downloads [12:58:00 FATAL]: Unhandled exception in thread Thread[pool-2-thread-2,5,main] com.google.gson.JsonSyntaxException: duplicate key: null at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:191) ~[Minecraft.jar:?] at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:146) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:795) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:761) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:710) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:682) ~[Minecraft.jar:?] at net.minecraft.launcher.updater.RemoteVersionList.getCompleteVersion(RemoteVersionList.java:32) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:213) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:37) ~[launcher.jar:1.6.89-j] at com.mojang.launcher.game.runner.AbstractGameRunner.playGame(AbstractGameRunner.java:67) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.game.GameLaunchDispatcher$1.run(GameLaunchDispatcher.java:111) ~[launcher.jar:1.6.89-j] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_131] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_131] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]I suspect some corrupted data in a json file, but which file, and how can I fix this? I have tried deleting the 1.14.4 jar files, but to no avail.
I use the old Java launcher because the new one does not work on my Linux distribution. Yesterday afternoon, the launcher suddenly refused to start up Minecraft 1.14.4. The launcher continues to work with all earlier versions of Minecraft, and was working with Minecraft 1.14.4 only yesterday morning.
When I press the "Play" button I see the message "Preparing...", and nothing else happens. In the launcher log, I see a stack trace as follows:
[12:58:00 INFO]: Queueing library & version downloads [12:58:00 FATAL]: Unhandled exception in thread Thread[pool-2-thread-2,5,main] com.google.gson.JsonSyntaxException: duplicate key: null at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:191) ~[Minecraft.jar:?] at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:146) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:795) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:761) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:710) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:682) ~[Minecraft.jar:?] at net.minecraft.launcher.updater.RemoteVersionList.getCompleteVersion(RemoteVersionList.java:32) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:213) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:37) ~[launcher.jar:1.6.89-j] at com.mojang.launcher.game.runner.AbstractGameRunner.playGame(AbstractGameRunner.java:67) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.game.GameLaunchDispatcher$1.run(GameLaunchDispatcher.java:111) ~[launcher.jar:1.6.89-j] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_131] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_131] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]I suspect some corrupted data in a json file, but which file, and how can I fix this? I have tried deleting the 1.14.4 jar files, but to no avail.
Error in Java Launcher 1.6.89-j withMinecraft1.14.4Legacy launcher can no longer start Minecraft
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Progress made ... I renamed the .minecraft folder to .old, then installed minecraft from scratch, and now I'm on the new launcher. I'm on Linux Mint 19.1, and the installer from the software manager failed on login, so instead I used the tar file, and now I can create a new world and play in single player. However, I find that although my minecraft server is up to date 1.14.4, the launcher says it's old. Tried downloading and updating the server.jar file from scratch and verifying that the server-properties is correct, but still it says old. But as far as this issue (
MCL-11993) l guess I can call the issue resolved on my end.
I installed the official launcher as many are suggesting. Unfortunately, my Dell XPS-13 "Developer Edition" - which came with Ubuntu 14.04 pre-installed, several years ago - fails to launch the new launcher with this error:
minecraft-launcher: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.20' not found (required by minecraft-launcher) minecraft-launcher: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version `CXXABI_1.3.9' not found (required by minecraft-launcher) minecraft-launcher: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by minecraft-launcher)So it seems I have a fun-filled weekend of Ubuntu distribution upgrade in my future? Or a new laptop purchase. At any rate, would be nice to have a minimum Ubuntu version listed on the downloads page.
A work-around for this would be great, seems very much like a programmer error "duplicate key" - not an intentional bug to discourage stealing.
Mod NoticeThis is an error that occurs only when launching 1.14.4, 19w36a, or versions that have been released after 19w36a. It happens because the legacy launcher does seem to have problems with downloading and installing the newer version files.
To work around this issue, you can install versions you want to play manually. This is a rather tedious task. If you can use the updated launcher, or a third party launcher (such as MultiMC), you might want to use those. (Beware of pirated third-party launchers though, they might steal your login data.)
How to install a version manually
- Close the launcher.
- Visit the version page of the version you want to play on the official Minecraft Wiki.
- On the top right of the page, you'll see a box with some informations about the version. Here, you find links to download the version files directly from Mojang's servers. Click the "Download → Client" and "Download → .json" links to download a client.jar file, and a <version>.json file.
- Navigate to your .minecraft folder.
- Navigate into the folder versions.
- Create a new folder. You may choose a custom name, but not the name of any vanilla version. For instance, I would recommend to use 1.14.4-fix if you want to install 1.14.4.
- Copy the client.jar file into the folder you just created and rename it so that it has the same name as the folder. For instance, for 1.14.4, that would be 1.14.4-fix.jar.
- Copy the <version>.json file you downloaded in that folder as well, and rename it so that it has the same name. For instance, for 1.14.4, that would be 1.14.4-fix.json.
- Open the .json file in a text editor of your choice.
- Edit the id field so that it now has the same name as you gave the version, for instance 1.14.4-fix.
- Delete the first download object.
- Save the file and close it.
- Open the launcher.
- Edit your launcher profile and select the version you just installed, for instance 1.14.4-fix.
Happy mining and crafting!
If you have trouble following these steps above, please do not comment on this ticket. Instead, I've opened a thread on Reddit if you need support.
I'm aware that this workaround is very tedious and hard to follow, but it's the only one that is found to work on computers that can't use the new launcher as of now.
I use the old Java launcher because the new one does not work on my Linux distribution. Yesterday afternoon, the launcher suddenly refused to start up Minecraft 1.14.4. The launcher continues to work with all earlier versions of Minecraft, and was working with Minecraft 1.14.4 only yesterday morning.
When I press the "Play" button I see the message "Preparing...", and nothing else happens. In the launcher log, I see a stack trace as follows:
[12:58:00 INFO]: Queueing library & version downloads [12:58:00 FATAL]: Unhandled exception in thread Thread[pool-2-thread-2,5,main] com.google.gson.JsonSyntaxException: duplicate key: null at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:191) ~[Minecraft.jar:?] at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:146) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:795) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:761) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:710) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:682) ~[Minecraft.jar:?] at net.minecraft.launcher.updater.RemoteVersionList.getCompleteVersion(RemoteVersionList.java:32) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:213) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:37) ~[launcher.jar:1.6.89-j] at com.mojang.launcher.game.runner.AbstractGameRunner.playGame(AbstractGameRunner.java:67) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.game.GameLaunchDispatcher$1.run(GameLaunchDispatcher.java:111) ~[launcher.jar:1.6.89-j] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_131] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_131] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]I suspect some corrupted data in a json file, but which file, and how can I fix this? I have tried deleting the 1.14.4 jar files, but to no avail.
![[Helper] Jack McKalling](../../../data/avatars/users/92859.png){kind=small}
Mod NoticeThis is an error that occurs only when launching 1.14.4, 19w36a, or versions that have been released after 19w36a. It happens because the legacy launcher does seem to have problems with downloading and installing the newer version files.
To work around this issue, you can install versions you want to play manually. This is a rather tedious task. If you can use the updated launcher, or a third party launcher (such as MultiMC), you might want to use those. (Beware of pirated third-party launchers though, they might steal your login data.)
How to install a version manually
- Close the launcher.
- Visit the version page of the version you want to play on the official Minecraft Wiki.
- On the top right of the page, you'll see a box with some informations about the version. Here, you find links to download the version files directly from Mojang's servers. Click the "Download → Client" and "Download → .json" links to download a client.jar file, and a <version>.json file.
- Navigate to your .minecraft folder.
- Navigate into the folder versions.
- Create a new folder. You may choose a custom name, but not the name of any vanilla version. For instance, I would recommend to use 1.14.4-fix if you want to install 1.14.4.
- Copy the client.jar file into the folder you just created and rename it so that it has the same name as the folder. For instance, for 1.14.4, that would be 1.14.4-fix.jar.
- Copy the <version>.json file you downloaded in that folder as well, and rename it so that it has the same name. For instance, for 1.14.4, that would be 1.14.4-fix.json.
- Open the .json file in a text editor of your choice.
- Edit the id field so that it now has the same name as you gave the version, for instance 1.14.4-fix.
- Delete the first downloads object.
- Save the file and close it.
- Open the launcher.
- Edit your launcher profile and select the version you just installed, for instance 1.14.4-fix.
Happy mining and crafting!
If you have trouble following these steps above, please do not comment on this ticket. Instead, I've opened a thread on Reddit if you need support.
I'm aware that this workaround is very tedious and hard to follow, but it's the only one that is found to work on computers that can't use the new launcher as of now.
I use the old Java launcher because the new one does not work on my Linux distribution. Yesterday afternoon, the launcher suddenly refused to start up Minecraft 1.14.4. The launcher continues to work with all earlier versions of Minecraft, and was working with Minecraft 1.14.4 only yesterday morning.
When I press the "Play" button I see the message "Preparing...", and nothing else happens. In the launcher log, I see a stack trace as follows:
[12:58:00 INFO]: Queueing library & version downloads [12:58:00 FATAL]: Unhandled exception in thread Thread[pool-2-thread-2,5,main] com.google.gson.JsonSyntaxException: duplicate key: null at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:191) ~[Minecraft.jar:?] at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:146) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:795) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:761) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:710) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:682) ~[Minecraft.jar:?] at net.minecraft.launcher.updater.RemoteVersionList.getCompleteVersion(RemoteVersionList.java:32) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:213) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:37) ~[launcher.jar:1.6.89-j] at com.mojang.launcher.game.runner.AbstractGameRunner.playGame(AbstractGameRunner.java:67) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.game.GameLaunchDispatcher$1.run(GameLaunchDispatcher.java:111) ~[launcher.jar:1.6.89-j] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_131] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_131] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]I suspect some corrupted data in a json file, but which file, and how can I fix this? I have tried deleting the 1.14.4 jar files, but to no avail.
Mod NoticeThis is an error that occurs only when launching 1.14.4, 19w36a, or versions that have been released after 19w36a. It happens because the legacy launcher does seem to have problems with downloading and installing the newer version files.
To work around this issue, you can install versions you want to play manually. This is a rather tedious task. If you can use the updated launcher, or a third party launcher (such as MultiMC), you might want to use those. (Beware of pirated third-party launchers though, they might steal your login data.)
How to install a version manually
- Close the launcher.
- Visit the version page of the version you want to play on the official Minecraft Wiki.
- On the top right of the page, you'll see a box with some informations about the version. Here, you find links to download the version files directly from Mojang's servers. Click the "Download → Client" and "Download → .json" links to download a client.jar file, and a <version>.json file.
- Navigate to your .minecraft folder.
- Navigate into the folder versions.
- Create a new folder. You may choose a custom name, but not the name of any vanilla version. For instance, I would recommend to use 1.14.4-fix if you want to install 1.14.4.
- Copy the client.jar file into the folder you just created and rename it so that it has the same name as the folder. For instance, for 1.14.4, that would be 1.14.4-fix.jar.
- Copy the <version>.json file you downloaded in that folder as well, and rename it so that it has the same name. For instance, for 1.14.4, that would be 1.14.4-fix.json.
- Open the .json file in a text editor of your choice.
- Edit the id field so that it now has the same name as you gave the version, for instance 1.14.4-fix.
- Delete the first downloads object.
- Save the file and close it.
- Open the launcher.
- Edit your launcher profile and select the version you just installed, for instance 1.14.4-fix.
Happy mining and crafting!
If you have trouble following these steps above, please do not comment on this ticket. Instead, I've opened a thread on Reddit if you need support.
I'm aware that this workaround is very tedious and hard to follow, but it's the only one that is found to work on computers that can't use the new launcher as of now.
I use the old Java launcher because the new one does not work on my Linux distribution. Yesterday afternoon, the launcher suddenly refused to start up Minecraft 1.14.4. The launcher continues to work with all earlier versions of Minecraft, and was working with Minecraft 1.14.4 only yesterday morning.
When I press the "Play" button I see the message "Preparing...", and nothing else happens.
In the launcher log, I see a stack trace as follows:[12:58:00 INFO]: Queueing library & version downloads [12:58:00 FATAL]: Unhandled exception in thread Thread[pool-2-thread-2,5,main] com.google.gson.JsonSyntaxException: duplicate key: null at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:191) ~[Minecraft.jar:?] at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:146) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:795) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:761) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:710) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:682) ~[Minecraft.jar:?] at net.minecraft.launcher.updater.RemoteVersionList.getCompleteVersion(RemoteVersionList.java:32) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:213) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:37) ~[launcher.jar:1.6.89-j] at com.mojang.launcher.game.runner.AbstractGameRunner.playGame(AbstractGameRunner.java:67) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.game.GameLaunchDispatcher$1.run(GameLaunchDispatcher.java:111) ~[launcher.jar:1.6.89-j] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_131] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_131] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]I suspect some corrupted data in a json file, but which file, and how can I fix this? I have tried deleting the 1.14.4 jar files, but to no avail.
Mod NoticeThis is an error that occurs only when launching 1.14.4, 19w36a, or versions that have been released after 19w36a. It happens because the legacy launcher does seem to have problems with downloading and installing the newer version files.
To work around this issue, you can install versions you want to play manually. This is a rather tedious task. If you can use the updated launcher, or a third party launcher (such as MultiMC), you might want to use those. (Beware of pirated third-party launchers though, they might steal your login data.)
How to install a version manually
- Close the launcher.
- Visit the version page of the version you want to play on the official Minecraft Wiki.
- On the top right of the page, you'll see a box with some informations about the version. Here, you find links to download the version files directly from Mojang's servers. Click the "Download → Client" and "Download → .json" links to download a client.jar file, and a <version>.json file.
- Navigate to your .minecraft folder.
- Navigate into the folder versions.
- Create a new folder. You may choose a custom name, but not the name of any vanilla version. For instance, I would recommend to use 1.14.4-fix if you want to install 1.14.4.
- Copy the client.jar file into the folder you just created and rename it so that it has the same name as the folder. For instance, for 1.14.4, that would be 1.14.4-fix.jar.
- Copy the <version>.json file you downloaded in that folder as well, and rename it so that it has the same name. For instance, for 1.14.4, that would be 1.14.4-fix.json.
- Open the .json file in a text editor of your choice.
- Edit the "id": "<version>" field so that it now has the same name as you gave the version, for instance "id": "1.14.4-fix".
- Delete the first downloads object ("downloads", and everything inside of the curly braces behind).
- Save the file and close it.
- Open the launcher.
- Edit your launcher profile and select the version you just installed, for instance 1.14.4-fix.
Happy mining and crafting!
If you have trouble following these steps above, please do not comment on this ticket. Instead, I've opened a thread on Reddit if you need support.
I'm aware that this workaround is very tedious and hard to follow, but it's the only one that is found to work on computers that can't use the new launcher as of now.
I use the old Java launcher because the new one does not work on my Linux distribution. Yesterday afternoon, the launcher suddenly refused to start up Minecraft 1.14.4. The launcher continues to work with all earlier versions of Minecraft, and was working with Minecraft 1.14.4 only yesterday morning.
When I press the "Play" button I see the message "Preparing...", and nothing else happens. In the launcher log, I see a stack trace as follows:
[12:58:00 INFO]: Queueing library & version downloads [12:58:00 FATAL]: Unhandled exception in thread Thread[pool-2-thread-2,5,main] com.google.gson.JsonSyntaxException: duplicate key: null at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:191) ~[Minecraft.jar:?] at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:146) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:795) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:761) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:710) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:682) ~[Minecraft.jar:?] at net.minecraft.launcher.updater.RemoteVersionList.getCompleteVersion(RemoteVersionList.java:32) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:213) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:37) ~[launcher.jar:1.6.89-j] at com.mojang.launcher.game.runner.AbstractGameRunner.playGame(AbstractGameRunner.java:67) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.game.GameLaunchDispatcher$1.run(GameLaunchDispatcher.java:111) ~[launcher.jar:1.6.89-j] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_131] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_131] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]I suspect some corrupted data in a json file, but which file, and how can I fix this? I have tried deleting the 1.14.4 jar files, but to no avail.
Mod NoticeThis is an error that occurs only when launching 1.14.4, 19w36a, or versions that have been released after 19w36a. It happens because the legacy launcher does seem to have problems with downloading and installing the newer version files.
To work around this issue, you can install versions you want to play manually. This is a rather tedious task. If you can use the updated launcher, or a third party launcher (such as MultiMC), you might want to use those. (Beware of pirated third-party launchers though, they might steal your login data.)
How to install a version manually
- Close the launcher.
- Visit the version page of the version you want to play on the official Minecraft Wiki.
- On the top right of the page, you'll see a box with some informations about the version. Here, you find links to download the version files directly from Mojang's servers. Click the "Download → Client" and "Download → .json" links to download a client.jar file, and a <version>.json file.
- Navigate to your .minecraft folder.
- Navigate into the folder versions.
- Create a new folder. You may choose a custom name, but not the name of any vanilla version. For instance, I would recommend to use 1.14.4-fix if you want to install 1.14.4.
- Copy the client.jar file into the folder you just created and rename it so that it has the same name as the folder. For instance, for 1.14.4, that would be 1.14.4-fix.jar.
- Copy the <version>.json file you downloaded in that folder as well, and rename it so that it has the same name. For instance, for 1.14.4, that would be 1.14.4-fix.json.
- Open the .json file in a text editor of your choice.
- Edit the "id": "
<version>" field so that it now has the same name as you gave the version, for instance "id": "1.14.4-fix".- Delete the first downloads object ("downloads", and everything inside of the curly braces behind).
- Save the file and close it.
- Open the launcher.
- Edit your launcher profile and select the version you just installed, for instance 1.14.4-fix.
Happy mining and crafting!
If you have trouble following these steps above, please do not comment on this ticket. Instead, I've opened a thread on Reddit if you need support.
I'm aware that this workaround is very tedious and hard to follow, but it's the only one that is found to work on computers that can't use the new launcher as of now.
I use the old Java launcher because the new one does not work on my Linux distribution. Yesterday afternoon, the launcher suddenly refused to start up Minecraft 1.14.4. The launcher continues to work with all earlier versions of Minecraft, and was working with Minecraft 1.14.4 only yesterday morning.
When I press the "Play" button I see the message "Preparing...", and nothing else happens.
In the launcher log, I see a stack trace as follows:[12:58:00 INFO]: Queueing library & version downloads [12:58:00 FATAL]: Unhandled exception in thread Thread[pool-2-thread-2,5,main] com.google.gson.JsonSyntaxException: duplicate key: null at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:191) ~[Minecraft.jar:?] at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:146) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:795) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:761) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:710) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:682) ~[Minecraft.jar:?] at net.minecraft.launcher.updater.RemoteVersionList.getCompleteVersion(RemoteVersionList.java:32) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:213) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:37) ~[launcher.jar:1.6.89-j] at com.mojang.launcher.game.runner.AbstractGameRunner.playGame(AbstractGameRunner.java:67) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.game.GameLaunchDispatcher$1.run(GameLaunchDispatcher.java:111) ~[launcher.jar:1.6.89-j] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_131] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_131] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]I suspect some corrupted data in a json file, but which file, and how can I fix this? I have tried deleting the 1.14.4 jar files, but to no avail.
Mod NoticeThis is an error that occurs only when launching 1.14.4, 19w36a, or versions that have been released after 19w36a. It happens because the legacy launcher does seem to have problems with downloading and installing the newer version files.
To work around this issue, you can install versions you want to play manually. This is a rather tedious task. If you can use the updated launcher, or a third party launcher (such as MultiMC), you might want to use those. (Beware of pirated third-party launchers though, they might steal your login data.)
How to install a version manually
- Close the launcher.
- Visit the version page of the version you want to play on the official Minecraft Wiki.
- On the top right of the page, you'll see a box with some informations about the version. Here, you find links to download the version files directly from Mojang's servers. Click the "Download → Client" and "Download → .json" links to download a client.jar file, and a <version>.json file.
- Navigate to your .minecraft folder.
- Navigate into the folder versions.
- Create a new folder. You may choose a custom name, but not the name of any vanilla version. For instance, I would recommend to use 1.14.4-fix if you want to install 1.14.4.
- Copy the client.jar file into the folder you just created and rename it so that it has the same name as the folder. For instance, for 1.14.4, that would be 1.14.4-fix.jar.
- Copy the <version>.json file you downloaded in that folder as well, and rename it so that it has the same name. For instance, for 1.14.4, that would be 1.14.4-fix.json.
- Open the .json file in a text editor of your choice.
- Edit the "id": "1.14.4" field so that it now has the same name as you gave the version, for instance "id": "1.14.4-fix".
- Delete the first downloads object.
- Save the file and close it.
- Open the launcher.
- Edit your launcher profile and select the version you just installed, for instance 1.14.4-fix.
Happy mining and crafting!
If you have trouble following these steps above, please do not comment on this ticket. Instead, I've opened a thread on Reddit if you need support.
I'm aware that this workaround is very tedious and hard to follow, but it's the only one that is found to work on computers that can't use the new launcher as of now.
I use the old Java launcher because the new one does not work on my Linux distribution. Yesterday afternoon, the launcher suddenly refused to start up Minecraft 1.14.4. The launcher continues to work with all earlier versions of Minecraft, and was working with Minecraft 1.14.4 only yesterday morning.
When I press the "Play" button I see the message "Preparing...", and nothing else happens. In the launcher log, I see a stack trace as follows:
[12:58:00 INFO]: Queueing library & version downloads [12:58:00 FATAL]: Unhandled exception in thread Thread[pool-2-thread-2,5,main] com.google.gson.JsonSyntaxException: duplicate key: null at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:191) ~[Minecraft.jar:?] at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:146) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:795) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:761) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:710) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:682) ~[Minecraft.jar:?] at net.minecraft.launcher.updater.RemoteVersionList.getCompleteVersion(RemoteVersionList.java:32) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:213) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:37) ~[launcher.jar:1.6.89-j] at com.mojang.launcher.game.runner.AbstractGameRunner.playGame(AbstractGameRunner.java:67) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.game.GameLaunchDispatcher$1.run(GameLaunchDispatcher.java:111) ~[launcher.jar:1.6.89-j] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_131] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_131] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]I suspect some corrupted data in a json file, but which file, and how can I fix this? I have tried deleting the 1.14.4 jar files, but to no avail.
Mod NoticeThis is an error that occurs only when launching 1.14.4, 19w36a, or versions that have been released after 19w36a. It happens because the legacy launcher does seem to have problems with downloading and installing the newer version files.
To work around this issue, you can install versions you want to play manually. This is a rather tedious task. If you can use the updated launcher, or a third party launcher (such as MultiMC), you might want to use those. (Beware of pirated third-party launchers though, they might steal your login data.)
How to install a version manually
- Close the launcher.
- Visit the version page of the version you want to play on the official Minecraft Wiki.
- On the top right of the page, you'll see a box with some informations about the version. Here, you find links to download the version files directly from Mojang's servers. Click the "Download → Client" and "Download → .json" links to download a client.jar file, and a <version>.json file.
- Navigate to your .minecraft folder.
- Navigate into the folder versions.
- Create a new folder. You may choose a custom name, but not the name of any vanilla version. For instance, I would recommend to use 1.14.4-fix if you want to install 1.14.4.
- Copy the client.jar file into the folder you just created and rename it so that it has the same name as the folder. For instance, for 1.14.4, that would be 1.14.4-fix.jar.
- Copy the <version>.json file you downloaded in that folder as well, and rename it so that it has the same name. For instance, for 1.14.4, that would be 1.14.4-fix.json.
- Open the .json file in a text editor of your choice.
- Edit the "id": "
1.14.4" field so that it now has the same name as you gave the version, for instance "id": "1.14.4-fix".- Delete the first downloads object.
- Save the file and close it.
- Open the launcher.
- Edit your launcher profile and select the version you just installed, for instance 1.14.4-fix.
Happy mining and crafting!
If you have trouble following these steps above, please do not comment on this ticket. Instead, I've opened a thread on Reddit if you need support.
I'm aware that this workaround is very tedious and hard to follow, but it's the only one that is found to work on computers that can't use the new launcher as of now.
I use the old Java launcher because the new one does not work on my Linux distribution. Yesterday afternoon, the launcher suddenly refused to start up Minecraft 1.14.4. The launcher continues to work with all earlier versions of Minecraft, and was working with Minecraft 1.14.4 only yesterday morning.
When I press the "Play" button I see the message "Preparing...", and nothing else happens.
In the launcher log, I see a stack trace as follows:[12:58:00 INFO]: Queueing library & version downloads [12:58:00 FATAL]: Unhandled exception in thread Thread[pool-2-thread-2,5,main] com.google.gson.JsonSyntaxException: duplicate key: null at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:191) ~[Minecraft.jar:?] at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:146) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:795) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:761) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:710) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:682) ~[Minecraft.jar:?] at net.minecraft.launcher.updater.RemoteVersionList.getCompleteVersion(RemoteVersionList.java:32) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:213) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:37) ~[launcher.jar:1.6.89-j] at com.mojang.launcher.game.runner.AbstractGameRunner.playGame(AbstractGameRunner.java:67) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.game.GameLaunchDispatcher$1.run(GameLaunchDispatcher.java:111) ~[launcher.jar:1.6.89-j] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_131] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_131] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]I suspect some corrupted data in a json file, but which file, and how can I fix this? I have tried deleting the 1.14.4 jar files, but to no avail.
Mod NoticeThis is an error that occurs only when launching 1.14.4, 19w36a, or versions that have been released after 19w36a. It happens because the legacy launcher does seem to have problems with downloading and installing the newer version files.
To work around this issue, you can install versions you want to play manually. This is a rather tedious task. If you can use the updated launcher, or a third party launcher (such as MultiMC), you might want to use those. (Beware of pirated third-party launchers though, they might steal your login data.)
How to install a version manually
- Close the launcher.
- Visit the version page of the version you want to play on the official Minecraft Wiki.
- On the top right of the page, you'll see a box with some informations about the version. Here, you find links to download the version files directly from Mojang's servers. Click the "Download → Client" and "Download → .json" links to download a client.jar file, and a <version>.json file.
- Navigate to your .minecraft folder.
- Navigate into the folder versions.
- Create a new folder. You may choose a custom name, but not the name of any vanilla version. For instance, I would recommend to use 1.14.4-fix if you want to install 1.14.4.
- Copy the client.jar file into the folder you just created and rename it so that it has the same name as the folder. For instance, for 1.14.4, that would be 1.14.4-fix.jar.
- Copy the <version>.json file you downloaded in that folder as well, and rename it so that it has the same name. For instance, for 1.14.4, that would be 1.14.4-fix.json.
- Open the .json file in a text editor of your choice.
- Edit the "id": "<version>" field so that it now has the same name as you gave the version, for instance "id": "1.14.4-fix".
- Delete the first downloads object ("downloads", and everything inside of the curly braces behind).
- Save the file and close it.
- Open the launcher.
- Edit your launcher profile and select the version you just installed, for instance 1.14.4-fix.
Happy mining and crafting!
If you have trouble following these steps above, please do not comment on this ticket. Instead, I've opened a thread on Reddit if you need support.
I'm aware that this workaround is very tedious and hard to follow, but it's the only one that is found to work on computers that can't use the new launcher as of now.
I use the old Java launcher because the new one does not work on my Linux distribution. Yesterday afternoon, the launcher suddenly refused to start up Minecraft 1.14.4. The launcher continues to work with all earlier versions of Minecraft, and was working with Minecraft 1.14.4 only yesterday morning.
When I press the "Play" button I see the message "Preparing...", and nothing else happens. In the launcher log, I see a stack trace as follows:
[12:58:00 INFO]: Queueing library & version downloads [12:58:00 FATAL]: Unhandled exception in thread Thread[pool-2-thread-2,5,main] com.google.gson.JsonSyntaxException: duplicate key: null at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:191) ~[Minecraft.jar:?] at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:146) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:795) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:761) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:710) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:682) ~[Minecraft.jar:?] at net.minecraft.launcher.updater.RemoteVersionList.getCompleteVersion(RemoteVersionList.java:32) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:213) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:37) ~[launcher.jar:1.6.89-j] at com.mojang.launcher.game.runner.AbstractGameRunner.playGame(AbstractGameRunner.java:67) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.game.GameLaunchDispatcher$1.run(GameLaunchDispatcher.java:111) ~[launcher.jar:1.6.89-j] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_131] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_131] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]I suspect some corrupted data in a json file, but which file, and how can I fix this? I have tried deleting the 1.14.4 jar files, but to no avail.
![[Mojang] slicedlime](../../../data/assets/gravatar/slicedlime.jpeg){kind=small}
[Mojang] slicedlime![[Mod] Michael Wobst](../../../data/avatars/users/37868.png){kind=small}
is duplicated by
Is the new launcher open source? I'm feeling unreasonably paranoid about what it might be doing (collecting), given that Java is easier to decompile than C++.
is duplicated by
Mod NoticeThis is an error that occurs only when launching 1.14.4, 19w36a, or versions that have been released after 19w36a. It happens because the legacy launcher does seem to have problems with downloading and installing the newer version files.
To work around this issue, you can install versions you want to play manually. This is a rather tedious task. If you can use the updated launcher, or a third party launcher (such as MultiMC), you might want to use those. (Beware of pirated third-party launchers though, they might steal your login data.)
How to install a version manually
- Close the launcher.
- Visit the version page of the version you want to play on the official Minecraft Wiki.
- On the top right of the page, you'll see a box with some informations about the version. Here, you find links to download the version files directly from Mojang's servers. Click the "Download → Client" and "Download → .json" links to download a client.jar file, and a <version>.json file.
- Navigate to your .minecraft folder.
- Navigate into the folder versions.
- Create a new folder. You may choose a custom name, but not the name of any vanilla version. For instance, I would recommend to use 1.14.4-fix if you want to install 1.14.4.
- Copy the client.jar file into the folder you just created and rename it so that it has the same name as the folder. For instance, for 1.14.4, that would be 1.14.4-fix.jar.
- Copy the <version>.json file you downloaded in that folder as well, and rename it so that it has the same name. For instance, for 1.14.4, that would be 1.14.4-fix.json.
- Open the .json file in a text editor of your choice.
- Edit the "id": "<version>" field so that it now has the same name as you gave the version, for instance "id": "1.14.4-fix".
- Delete the first downloads object ("downloads", and everything inside of the curly braces behind).
- Save the file and close it.
- Open the launcher.
- Edit your launcher profile and select the version you just installed, for instance 1.14.4-fix.
Happy mining and crafting!
If you have trouble following these steps above, please do not comment on this ticket. Instead, I've opened a thread on Reddit if you need support.
I'm aware that this workaround is very tedious and hard to follow, but it's the only one that is found to work on computers that can't use the new launcher as of now.
I use the old Java launcher because the new one does not work on my Linux distribution. Yesterday afternoon, the launcher suddenly refused to start up Minecraft 1.14.4. The launcher continues to work with all earlier versions of Minecraft, and was working with Minecraft 1.14.4 only yesterday morning.
When I press the "Play" button I see the message "Preparing...", and nothing else happens. In the launcher log, I see a stack trace as follows:
[12:58:00 INFO]: Queueing library & version downloads [12:58:00 FATAL]: Unhandled exception in thread Thread[pool-2-thread-2,5,main] com.google.gson.JsonSyntaxException: duplicate key: null at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:191) ~[Minecraft.jar:?] at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:146) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:795) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:761) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:710) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:682) ~[Minecraft.jar:?] at net.minecraft.launcher.updater.RemoteVersionList.getCompleteVersion(RemoteVersionList.java:32) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:213) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:37) ~[launcher.jar:1.6.89-j] at com.mojang.launcher.game.runner.AbstractGameRunner.playGame(AbstractGameRunner.java:67) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.game.GameLaunchDispatcher$1.run(GameLaunchDispatcher.java:111) ~[launcher.jar:1.6.89-j] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_131] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_131] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]I suspect some corrupted data in a json file, but which file, and how can I fix this? I have tried deleting the 1.14.4 jar files, but to no avail.
Mod NoticeA new version of the legacy launcher has been released that solves this issue. If your launcher does not automatically update, you can download the updated version here.
If you're able to launch the updated launcher (2.x.x), it is recommended to update to this one instead. You can find the download links for it here. If you're not able to launch the 2.x.x launcher, please create a new ticket about that.
You find the workaround for this issue that could be used before it was fixed below. It is recommended to use the updated launcher (legacy or not) instead of using the workaround below.
This is an error that occurs only when launching 1.14.4, 19w36a, or versions that have been released after 19w36a. It happens because the legacy launcher does seem to have problems with downloading and installing the newer version files.
To work around this issue, you can install versions you want to play manually. This is a rather tedious task. If you can use the updated launcher, or a third party launcher (such as MultiMC), you might want to use those. (Beware of pirated third-party launchers though, they might steal your login data.)
How to install a version manually
- Close the launcher.
- Visit the version page of the version you want to play on the official Minecraft Wiki.
- On the top right of the page, you'll see a box with some informations about the version. Here, you find links to download the version files directly from Mojang's servers. Click the "Download → Client" and "Download → .json" links to download a client.jar file, and a <version>.json file.
- Navigate to your .minecraft folder.
- Navigate into the folder versions.
- Create a new folder. You may choose a custom name, but not the name of any vanilla version. For instance, I would recommend to use 1.14.4-fix if you want to install 1.14.4.
- Copy the client.jar file into the folder you just created and rename it so that it has the same name as the folder. For instance, for 1.14.4, that would be 1.14.4-fix.jar.
- Copy the <version>.json file you downloaded in that folder as well, and rename it so that it has the same name. For instance, for 1.14.4, that would be 1.14.4-fix.json.
- Open the .json file in a text editor of your choice.
- Edit the "id": "<version>" field so that it now has the same name as you gave the version, for instance "id": "1.14.4-fix".
- Delete the first downloads object ("downloads", and everything inside of the curly braces behind).
- Save the file and close it.
- Open the launcher.
- Edit your launcher profile and select the version you just installed, for instance 1.14.4-fix.
Happy mining and crafting!
If you have trouble following these steps above, please do not comment on this ticket. Instead, I've opened a thread on Reddit if you need support.
I'm aware that this workaround is very tedious and hard to follow, but it's the only one that is found to work on computers that can't use the new launcher as of now.
I use the old Java launcher because the new one does not work on my Linux distribution. Yesterday afternoon, the launcher suddenly refused to start up Minecraft 1.14.4. The launcher continues to work with all earlier versions of Minecraft, and was working with Minecraft 1.14.4 only yesterday morning.
When I press the "Play" button I see the message "Preparing...", and nothing else happens. In the launcher log, I see a stack trace as follows:
[12:58:00 INFO]: Queueing library & version downloads [12:58:00 FATAL]: Unhandled exception in thread Thread[pool-2-thread-2,5,main] com.google.gson.JsonSyntaxException: duplicate key: null at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:191) ~[Minecraft.jar:?] at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:146) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:795) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:761) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:710) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:682) ~[Minecraft.jar:?] at net.minecraft.launcher.updater.RemoteVersionList.getCompleteVersion(RemoteVersionList.java:32) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:213) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:37) ~[launcher.jar:1.6.89-j] at com.mojang.launcher.game.runner.AbstractGameRunner.playGame(AbstractGameRunner.java:67) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.game.GameLaunchDispatcher$1.run(GameLaunchDispatcher.java:111) ~[launcher.jar:1.6.89-j] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_131] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_131] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]I suspect some corrupted data in a json file, but which file, and how can I fix this? I have tried deleting the 1.14.4 jar files, but to no avail.
Mod NoticeA new version of the legacy launcher has been released that solves this issue. If your launcher does not automatically update, you can download the updated version (1.6.93) here.
If you're able to launch the updated launcher (2.x.x), it is recommended to update to this one instead. You can find the download links for it here. If you're not able to launch the 2.x.x launcher, please create a new ticket about that.
You find the workaround for this issue that could be used before it was fixed below. It is recommended to use the updated launcher (legacy or not) instead of using the workaround below.
This is an error that occurs only when launching 1.14.4, 19w36a, or versions that have been released after 19w36a. It happens because the legacy launcher does seem to have problems with downloading and installing the newer version files.
To work around this issue, you can install versions you want to play manually. This is a rather tedious task. If you can use the updated launcher, or a third party launcher (such as MultiMC), you might want to use those. (Beware of pirated third-party launchers though, they might steal your login data.)
How to install a version manually
- Close the launcher.
- Visit the version page of the version you want to play on the official Minecraft Wiki.
- On the top right of the page, you'll see a box with some informations about the version. Here, you find links to download the version files directly from Mojang's servers. Click the "Download → Client" and "Download → .json" links to download a client.jar file, and a <version>.json file.
- Navigate to your .minecraft folder.
- Navigate into the folder versions.
- Create a new folder. You may choose a custom name, but not the name of any vanilla version. For instance, I would recommend to use 1.14.4-fix if you want to install 1.14.4.
- Copy the client.jar file into the folder you just created and rename it so that it has the same name as the folder. For instance, for 1.14.4, that would be 1.14.4-fix.jar.
- Copy the <version>.json file you downloaded in that folder as well, and rename it so that it has the same name. For instance, for 1.14.4, that would be 1.14.4-fix.json.
- Open the .json file in a text editor of your choice.
- Edit the "id": "<version>" field so that it now has the same name as you gave the version, for instance "id": "1.14.4-fix".
- Delete the first downloads object ("downloads", and everything inside of the curly braces behind).
- Save the file and close it.
- Open the launcher.
- Edit your launcher profile and select the version you just installed, for instance 1.14.4-fix.
Happy mining and crafting!
If you have trouble following these steps above, please do not comment on this ticket. Instead, I've opened a thread on Reddit if you need support.
I'm aware that this workaround is very tedious and hard to follow, but it's the only one that is found to work on computers that can't use the new launcher as of now.
I use the old Java launcher because the new one does not work on my Linux distribution. Yesterday afternoon, the launcher suddenly refused to start up Minecraft 1.14.4. The launcher continues to work with all earlier versions of Minecraft, and was working with Minecraft 1.14.4 only yesterday morning.
When I press the "Play" button I see the message "Preparing...", and nothing else happens. In the launcher log, I see a stack trace as follows:
[12:58:00 INFO]: Queueing library & version downloads [12:58:00 FATAL]: Unhandled exception in thread Thread[pool-2-thread-2,5,main] com.google.gson.JsonSyntaxException: duplicate key: null at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:191) ~[Minecraft.jar:?] at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:146) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) ~[Minecraft.jar:?] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:795) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:761) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:710) ~[Minecraft.jar:?] at com.google.gson.Gson.fromJson(Gson.java:682) ~[Minecraft.jar:?] at net.minecraft.launcher.updater.RemoteVersionList.getCompleteVersion(RemoteVersionList.java:32) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:213) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:37) ~[launcher.jar:1.6.89-j] at com.mojang.launcher.game.runner.AbstractGameRunner.playGame(AbstractGameRunner.java:67) ~[launcher.jar:1.6.89-j] at net.minecraft.launcher.game.GameLaunchDispatcher$1.run(GameLaunchDispatcher.java:111) ~[launcher.jar:1.6.89-j] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_131] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_131] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]I suspect some corrupted data in a json file, but which file, and how can I fix this? I have tried deleting the 1.14.4 jar files, but to no avail.
launcher.jar
![[Mod] Neko](../../../data/avatars/users/92901.png){kind=small}
This solution does not work for 1.15.2. Still getting that gson exception...
![[Mod] Greymagic27](../../../data/avatars/users/92875.png){kind=small}
is duplicated by
![[Mod] Torabi](../../../data/assets/gravatar/torabi.png){kind=small}
is duplicated by
![[Bot] Arisa](../../../data/avatars/users/43007.png){kind=small}
is duplicated by
Thank you for your report!
We're actually already tracking this issue in MCL-11993, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki
Thank you for your report!
We're actually already tracking this issue in MCL-11993, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki
Thank you for your report!
We're actually already tracking this issue in MCL-11993, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki
Duplicate of MCL-11993. Please update your launcher in order to solve this issue.
MCL-11993 recommends to switch to the new launcher (without any docs for how to do so). The fix of downloading the new version of the legacy-launcher fails (see MCL-12328)
So I downloaded https://launcher.mojang.com/download/Minecraft.tar.gz and unpacked it. It contains Minecraft/minecraft-launcher and inside "minecraft-launcher" which I started from a terminal. It exits right away without any error.
It does not look like its missing any libs:
ldd ./minecraft-launcher
linux-vdso.so.1 (0x00007fffa3937000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007f5d343e1000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f5d343bf000)
libstdc+.so.6 => /usr/lib64/libstdc+.so.6 (0x00007f5d341dd000)
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f5d341c3000)
libc.so.6 => /lib64/libc.so.6 (0x00007f5d33ffc000)
/lib64/ld-linux-x86-64.so.2 (0x00007f5d34408000)
libm.so.6 => /lib64/libm.so.6 (0x00007f5d33eb7000)
Attached an strace.log, but also there I don't see anything obvious.
I can't report the verion that I got from the download, because there is no version indication in the files (not even running 'strings minecraft-launcher'). Maybe the dates help:
rw-rr- 1 ensonic users 621568 13. Dez 2017 cef_100_percent.pak
rw-rr- 1 ensonic users 730195 13. Dez 2017 cef_200_percent.pak
rw-rr- 1 ensonic users 3381507 13. Dez 2017 cef_extensions.pak
rw-rr- 1 ensonic users 4115814 13. Dez 2017 cef.pak
-rwxr-xr-x 1 ensonic users 26592 13. Dez 2017 chrome-sandbox
rw-rr- 1 ensonic users 10196592 13. Dez 2017 icudtl.dat
-rwxr-xr-x 1 ensonic users 125944304 23. Jul 11:25 libcef.so
rw-rr- 1 ensonic users 9988448 23. Jul 11:25 liblauncher.so
drwxr-xr-x 1 ensonic users 682 23. Jul 11:25 locales
-rwxr-xr-x 1 ensonic users 67744 23. Jul 11:25 minecraft-launcher
-rwxr-xr-x 1 ensonic users 218275 13. Dez 2017 natives_blob.bin
-rwxr-xr-x 1 ensonic users 1530292 13. Dez 2017 snapshot_blob.bin
rw-rr- 1 ensonic users 82231 16. Okt 21:29 strace.log
-rwxr-xr-x 1 ensonic users 1948168 13. Dez 2017 v8_context_snapshot.bin
This issue is Invalid because of a number of reasons:
- Only one issue per ticket please.
- 1.11.2 is no longer supported, and crashes with it have already been fixed in later versions.
- You're using a very outdated version of the launcher, the current version for Linux is 2.1.7658. If that version doesn't work for you, see
MCL-11993.
Please use the current version of the launcher (or the current version of the legacy launcher) in order to be able to play current versions of Minecraft.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki
See MCL-11993
You need an updated version of the launcher. See MCL-11993 for instructions.
Thank you for your report!
We're tracking this issue in MCL-11993, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as Fixed. The fix will arrive in the next version or is already included in the latest development version of the game, you can check the Fix Version/s field in that ticket to learn more.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
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Moved to Minecraft Launcher (MCL) project.
I have exactly the same problem with 1.14.4 on my linux (OpenSuse 42.3) since yesterday and my Launcher log also says the same.
And the big bottom button of the Launcher stucks while saying "Preparing..."
@Ste I forgot to mention it in the original post but I see the "Preparing..." message on the button too. Seems identical. I will edit in a note to the description.
This might be caused by the obfuscation maps now being included in the version manifest.
I have the same FATAL error in my logs as above
[12:36:03 FATAL]: Unhandled exception in thread Thread[pool-2-thread-2,5,main]com.google.gson.JsonSyntaxException: duplicate key: null
...
I am having the exact same problem. Loads fine in everything except for 1.14.4
I cannot update the launcher because I am running Windows Vista Home Premium SP2 64bit
I'm using Ubuntu 16.04 and I just can't launch 1.14.4 on my computer. Same problem where it is stuck on preparing. I have to use the old version launcher since apparently the new one says that I couldn't connect to internet even though it works fine and it also makes me play offline.
I found a new article that says he used the new launcher and it worked fine when he switched so most likely the 1.14.4 is only allowed to work on the new launcher. Don't hold me accountable for that, it's just a theory but most likely Mojang or Microsoft or whoever is in control may have made the files only work for certain launchers.
@Julian As a stopgap I am using the MultiMC launcher. Although it is not a Mojang launcher it seems to work fine, it is free and available for all platforms. Once you have downloaded and installed it, copy your saved worlds into the appropriate place, login with your Mojang userid and away you go.
I will certainly check it out.
Thanks for letting me know.
It appears that this issue is caused by "1.14.4.json" file formating being broken and obfuscation maps entries now being included in the 1.14.4.json file.
Reformating the "1.14.4.json" file with a json editor and removing the obfuscation maps entries then adding this fixed json as a custom version seems to fix it.
Hm, I can't find the 1.14.4.json file with a fresh .minecraft folder.
@Conor Garland, @Marc Larue The first thing I tried was deleting the 1.14.4 download folder to force a fresh download, this had no effect. The launcher was unable get a fresh download because the error occurs before it gets that far.
@Robert Bowles, @Marc Larue
Download the original "1.14.4.json" file and the 1.14.4 Client here: https://minecraft.gamepedia.com/Java_Edition_1.14.4 then reformat it.
What is an obfuscation map entry? By reformat, do you mean adding whitespace characters?
I can attest to this happening on 3 different computers of mine. Two have different versions of GNU/Linux (Trisquel on one, xubuntu on another) and one is a Windows machine (Win7). They all stopped working simultaneously just the other day specifically for 1.14.4, all other versions still work.
I am getting the exact same errors as the original poster.
If any of the advanced users here have figured this out and could clue us in on what reformatting json files is, and what obfuscation map entries are, that would be great.
I suspect that it is something more to do with the launcher version than any file, because the error happens before you even try to load 1.14.4. And it doesn't effect the newer launcher that has the built in JRE that MS puts out.
@ConnorGarland @violine1101 can you be more specific? Do you mean the client_mappings and server_mappings nodes on the 1.14.4.json, and that we should manually remove them? I see that those are the new nodes that were added.
I removed the old and installed the new launcher using the .tar file (not the one from the Linux Mint Software Manager, which crashes while opening the launcher). Seems to work fine now. Once I figured out that I could change from a snapshot to 1.14.4, I can get to my server again. So for me, the problem was resolved by upgrading to the new launcher.
I have the same issue on Xubuntu 16.04.6 LTS.
My issue was closed as duplicate of yours
https://bugs.mojang.com/browse/MCL-11997
So I tried diffing the old and new 1.14.4.json
The only difference was the assetIndex which in turn points to a different 1.14.json
Those json in turn had some new language json files...
Can @violine1101 clarify what she means by "obfuscation maps now being included in the version manifest" or @Conor by "reformat"?
I tried "reformatting" the json in a viewer and copying that into the 1.14.4.json file and it didn't work.
Update to the new launcher.
Why, Java Minecraft is Java, why bundle it in an executable?
For anyone curious (like I was) the reason this is happening is that the legacy launcher installed to /opt/minecraft (least when I originally installed it via the Debian package). The new launcher (installed the same ) places files in /opt/minecraft-launcher.
At the time I (and probably many others) made a symbolic link to the minecraft.sh script. By doing so no matter how many times I upgraded I always ran the old version. I (and likely others) never thought this is was problem because us Linux folks are used to never having updates to programs especially with past MS history (imagine the egg on my face).
I fixed the problem by downloading the latest Debian package from the download page, Installed it, and re-pointing my symlink to the new executable:
Same problem here, same logs, and not an option to use the native launcher, I cannot upgrade the underlying Linux, and the native launcher won't start (CXXABI one version too old).
Will the old Java Launcher 1.6.89-j be upgraded? Thanks!
@Devin Weaver and others. Thanks to all the contributors to the comments. So far I have found two alternatives that work for me (Linux Devuan Ascii / Debian Stretch) which I summarize here:
Official Launcher: Following Devin I deinstalled/reinstalled the newest version of the official launcher, making sure to install any unmet dependencies. First download the deb, then (for Debian-like systems):
One snag I met was there seems to be no way to configure Java in the new launcher, so I had to re-configure the default Java at the system level (annoying as I have about 8 different Javas on one of my boxes).
Unofficial Launchers: YMMV but I found MultiMC worked out of the box but is fiddly to get used to because it has so many powerful options. It is available for Linux Mac and at least some flavours of Windows.
So the workaround is to use another launcher or upgrade to the new one? @Devin Weaver - Your Launcher was installed? I just run mine from a Minecraft.jar file and don't have any other files anyware else that pertain to it. I run it the same way on the Windows 7 machine as well.
I installed the official launcher as many are suggesting. Unfortunately, my Dell XPS-13 "Developer Edition" - which came with Ubuntu 14.04 pre-installed, several years ago - fails to launch the new launcher with this error:
So it seems I have a fun-filled weekend of Ubuntu distribution upgrade in my future? Or a new laptop purchase. At any rate, would be nice to have a minimum Ubuntu version listed on the downloads page.
A work-around for this would be great, seems very much like a programmer error "duplicate key" - not an intentional bug to discourage stealing.
Just to add my 2 cents:
If you do a diff on 19w36a.json & 19w35a.json you can see that 2 new subsections were added to the downloads section called "client_mappings" and "server_mappings". Those two are most likely the culprit for the duplicate key error.
If anyone is curious enough you can find links to those files @ https://launchermeta.mojang.com/mc/game/version_manifest.json
So this 'bug' of requiring an additional txt file was introduced with snapshot 19w36a on 2019-09-04 and it also affects release 1.14.4 because it was added retroactively to that version on the same day. That's not how such a thing should be handled normally, imho the next higher version should've introduced it to the release branch. Because of this it actually does sound more like an anti piracy feature to me.
It is not an anti-piracy feature, and the version has not been changed retroactively per se. In layman's terms, this 'manifest' is making modders' lives easier. That's why they've been released. Apparently the old launcher does not know how to handle this new information.
To anyone who has this bug I can only give the advice to give the new launcher a try, or alternatively use a third-party launcher (such as MultiMC; beware of pirated third-party launchers though, they might steal your login data).
If those don't work, make sure that you're running the latest version of the legacy launcher, which is 1.6.91-j. If you're still on an old version of the legacy launcher and the launcher doesn't auto-update to a newer version of the legacy launcher, try this link to download it: https://launcher.mojang.com/mc/launcher/jar/fa896bd4c79d4e9f0d18df43151b549f865a3db6/launcher.jar.lzma. The wiki only says that there have been unknown changes in this version, so I don't know if that actually changes anything significant, but it still might be worth a shot.
If that doesn't work either, chances are your computer does no longer meet the minimum system requirements needed to run Minecraft and is no longer supported by Mojang. Specifically, Linux 32-bit systems are no longer supported by Minecraft if I am informed correctly.
As a workaround (do this at your own risk), you should be able to play 1.14.4 as normal by launching 1.14.4 Pre-Release 7. That version is identical to 1.14.4 in every aspect but the name and the fact that it does not have obfuscation maps. You can't play multiplayer on 1.14.4 servers with that version, though.
I cannot comment on whether this issue will be fixed by Mojang as I am unsure whether the legacy launcher is supported anymore. A Mojang employee will need to clear that up.
Can I get a refund?
@[Mod~violine1101]
"To anyone who has this bug I can only give the advice to give the new launcher a try"
I would give it a try, but how can I use the "launcher.jar.lzma" in an existing installation of Minecrafrt in (X)ubuntu?
I made an backup of the "saves". How can I start the game?
Thank you
Don't know, ask that question to customer support. If you can play older versions of the game, probably not.
Unzip it and run the jar file in it. It's the latest version of the legacy launcher. I cannot guarantee that it'll work.
@[Mod~violine1101]
running the jar-file:
Minecraft Launcher 1.6.91 is able to be executed, but the error seems to be the same
"[15:54:51 FATAL]: Unhandled exception in thread Thread[pool-2-thread-2,5,main]"
The "Preparing..." message on the button stays grey and don't disappear.
I would be really happy to continue playing the payed game, to which person can I write?
Thanks a lot for your help.
edit: typos
For technical support, please visit this link: 💬 Community Support
I'm running version 1.6.91-j on windows XP, and get the same error now since both 19w36a and 19w37a. So updating the legacy launcher to its latest version will not help.
@[Mod] violine1101 :
"For technical support, please visit..."
thanks a lot
I can confirm it is possible to run these snapshots (at least in my winXP 1.6.91-j setup) if you install them manually with a custom name (just like a modded version). Workaround will be added to the description
As [Helper] Jack McKalling already said, we've found a workaround, which I've now added to the description of this ticket. If you need support with installing a version manually, please post a comment in the Reddit thread that I created for support with this issue.
So is gson trying to parse the mapping files?
Just stop obfuscating the game instead?
The issue has been fixed in a future version of the (legacy) launcher by slicedlime. Please be patient as they are releasing this new version soon.
@Jack
"... as they are releasing this new version soon."
I was playing 2 years on my machine and never did any launcher/gameupdates "manually", but only with the paket manager or "sudo apt...". I even can't remember how I installed the game.
So I'm interrested where I can get (later/soon) this updated launcher.
Can you confirm please that the use of the new launcher will be like here described?
https://bugs.mojang.com/browse/MCL-11993?focusedCommentId=582137&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-582137
The updated version has now been released. The version you are looking for is 1.6.93, and the native launcher executable should automatically update you to it.
If you need to download it manually for some reason, you can do so here. I do highly suggest you migrate away from that flow however - it is unsupported and might not work in the future.
Thanks a lot! It works on my platform now.
Ok, can you explain what was wrong?
/Just curious
@slicedlime
thanks for the fix.
I bought the game 2017 (running on Xubuntu 64bit) and I was guided officially to use the legacy launcher.
You suggest to migrate. Do you mean the "2.0 branch of the launcher", I heard now on reddit the first time of this.
Where do I get it?
top secret All the main downloads are here: https://www.minecraft.net/en-us/download/alternative/
@slicedlime.
Thanks, I'll have a try
The new launcher @slicedlime posted seems to work, but the old bootstrap (Minecraft Bootstrap v5) seems to download an old version of the launcher (1.6.89-j) from https://s3.amazonaws.com/Minecraft.Download/launcher/launcher.pack.lzma . Can you fix this?
The old bootstrap is no longer supported.
@slicedlime Thank you, that fixed it!
For anyone still having problems.
Can confirm fix works
I am thankful that it works now, as Im not able to install the newer launcher on my chromebook
RedCMD What prevents you from installing the new launcher? Have you reported a bug about that?
@slicedlime I reported
MCL-12019, which prevents me opening the new launcher.I went to /home/username/.minecraft/versions
{ more stuff}created new dir /home/username/.minecraft/versions/1.14.4-fix
dowloaded the client and json files as described to the new dir
renamed them to 1.14.4-fix.jar and 1.14.4-fix.json
edited the json file, vi 1.14.4-fix.json did search for id, and altered that to be "id" : "1.14.4-fix" (note was like the 5th id found after uid uuid ...)
followed this up by finding downloads, removed "downloads" : { <tons of stuff
stuff {more stuff} ... } ## between those {} were like 3 sets of other curly braces, sha ... URL, etc, seemed like over 100 characters total.
Launched - and NO sign of my 1.14.4-fix!
tried again, same
Went and downloaded the launcher file mentioned, still not luck
Repeated all the steps again - sadly the same result. Please tell me if I've done wrong.
Idea 1, just put out the files together as a download so people can just unzip them in the versions directory (and then move the working launcher if that's really necessary). I'm not the only one finding this editing of the file to be difficult. Please step up a bit to make this fix more direct. If you all have done the above edit to the json file then please just share a link here to that file with what ever name you've chosen for the ID.
Sorry if I'm being too blunt but I really felt like I've been patient thinking a fix would be out after a week or so ( I've worked in IT for over a decade so I know how it can be sometimes) but this is dragging on too long. This problems been going on for WEEKS, maybe a month or more now. At some point the server I've played on for almost a year will let my claims expire simply because I can't log in!
I'll check back tomorrow, thanks in advance! Other than this I've had a great experience with Minecraft, I know it can be cleared up. Thanks again.
Ken J, just download launcher version 1.6.93 [here|https://launcher.mojang.com/v1/objects/eabbff5ff8e21250e33670924a0c5e38f47c840b/launcher.jar,] and then you won't have to do anything with 1.14.4-fix (at least it worked for me).
Out of curiosity, is there any way to continue with the "workaround" fix? Albeit unsupported I'm attempting to install and play Minecraft on a Windows XP system. I can't use 1.6.93 because it requires Java 8, which is incompatible with Windows XP, and the new launcher simply fails to run ("Unable to start Minecraft Runtime Environment" error keeps popping up).I can't seem to get the "fixed" version showing in the launcher settings. (I should mention I am trying it on 20w13b.)
@EarthToAccess I have no idea if Win XP is supported anymore by anyone, it went EOL several years ago. I think your best bet would be to install a more modern OS. If you can't stomach recent offerings of Windows or there are performance issues with them on your hardware, I can personally recommend some flavour of Linux, which I have been using for my computing needs exclusively for the last 12 years. Minecraft JE runs fine on that. As a 'beginner' distribution, you can do a lot worse than Ubuntu which has a vibrant user base and online support.
Yea, I know. I personally have been using Ubuntu for a while and I've got a Windows 10 computer, I'm just messing with Windows XP on a virtual machine and wanted to see if Minecraft runs well enough on it. I'm fairly certain it would, but I can't get it to actually open because of the launcher issue. Using new software etc. is definitely viable as I already am using said software and hardware, I just wanted to know if it was possible so I could potentially mess with things.
I tested out the launcher linked above (1.6.93), and got the following error message:
A Java Exception has occurred.
Do you have any suggestions on how I could fix this?
This does not work for 1.15.2. Same exception...
Is this for Linux top hat and jack? It’s easier to know what the problem is when we know the operating system.
I guess the exception people are talking about is:
[10:14:18 ERROR]: Couldn't download resources
java.io.IOException: Server returned HTTP response code: 403 for URL: https://s3.amazonaws.com/Minecraft.Download/indexes/1.14.json
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1900) ~[?:1.8.0_251]
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1498) ~[?:1.8.0_251]
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:268) ~[?:1.8.0_251]
at net.minecraft.launcher.updater.MinecraftVersionManager.getResourceFiles(MinecraftVersionManager.java:274) [launcher.jar:1.6.93]
at net.minecraft.launcher.updater.MinecraftVersionManager.downloadResources(MinecraftVersionManager.java:256) [launcher.jar:1.6.93]
at com.mojang.launcher.game.runner.AbstractGameRunner.downloadRequiredFiles(AbstractGameRunner.java:123) [launcher.jar:1.6.93]
at net.minecraft.launcher.game.MinecraftGameRunner.downloadRequiredFiles(MinecraftGameRunner.java:96) [launcher.jar:1.6.93]
at com.mojang.launcher.game.runner.AbstractGameRunner.playGame(AbstractGameRunner.java:110) [launcher.jar:1.6.93]
at net.minecraft.launcher.game.GameLaunchDispatcher$1.run(GameLaunchDispatcher.java:111) [launcher.jar:1.6.93]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_251]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_251]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_251]
which is caused by mojang disabling the s3 downloads.
Unfortunately Twitch doesn't really update their app correctly on mac so it doesn't support the new 2.x native launcher and we are stuck with the jar launcher (perhaps people on Linux, Debian etc too.)
The JVM errors are due to the default flags provided by the launcher.
To fix the errors, set this for your JVM arguments in the profile:
-Xmx3G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
This is the new (2.0) launcher flags, and work fine from my experience. You can change the -Xmx3G to whatever RAM you would like to allocate.