MC-137300ConcurrentModificationException thrown when upgrading world
The bug
Converted worlds produce the error below in constantly when flying around, and chunks that should get loaded are not being loaded as seen in the screenshot.
The example log took me ~30 seconds to get a few erors.
[16:38:58] [Server thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.util.ConcurrentModificationException
at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_181]
at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_181]
at k.a(SourceFile:200) [1.13.2-pre1.jar:?]
at net.minecraft.server.MinecraftServer.b(SourceFile:726) [1.13.2-pre1.jar:?]
at net.minecraft.server.MinecraftServer.a(SourceFile:681) [1.13.2-pre1.jar:?]
at dgh.a(SourceFile:131) [1.13.2-pre1.jar:?]
at net.minecraft.server.MinecraftServer.run(SourceFile:584) [1.13.2-pre1.jar:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_181]
Caused by: java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(Unknown Source) ~[?:1.8.0_181]
at java.util.HashMap$EntryIterator.next(Unknown Source) ~[?:1.8.0_181]
at java.util.HashMap$EntryIterator.next(Unknown Source) ~[?:1.8.0_181]
at bnj.E(SourceFile:1162) ~[1.13.2-pre1.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_181]
at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_181]
at k.a(SourceFile:199) ~[1.13.2-pre1.jar:?]
... 5 more
Code analysis
Code analysis by [Mod] md_5 can be found in this comment.
Linked Issues
Created Issue:
ConcurrentModificationsException spamming log
This is no crash, but the log shows multiple ConcurrentModificationException while flying around in the world. Example that took me ~30 seconds to produce attached in the log
Attachments1
![[Mod] Michael Wobst](../../../data/avatars/users/37868.png){kind=small}
Changed Description:
This is no crash, but the log shows multiple ConcurrentModificationException while flying around in the world. Example that took me ~30 seconds to produce attached in the log
Changed Description:
The bug
This is no crash, but the log shows multiple ConcurrentModificationException while flying around in the world. Example that took me ~30 seconds to produce attached in the log.
[16:38:58] [Server thread/FATAL]: Error executing task java.util.concurrent.ExecutionException: java.util.ConcurrentModificationException at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_181] at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_181] at k.a(SourceFile:200) [1.13.2-pre1.jar:?] at net.minecraft.server.MinecraftServer.b(SourceFile:726) [1.13.2-pre1.jar:?] at net.minecraft.server.MinecraftServer.a(SourceFile:681) [1.13.2-pre1.jar:?] at dgh.a(SourceFile:131) [1.13.2-pre1.jar:?] at net.minecraft.server.MinecraftServer.run(SourceFile:584) [1.13.2-pre1.jar:?] at java.lang.Thread.run(Unknown Source) [?:1.8.0_181] Caused by: java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(Unknown Source) ~[?:1.8.0_181] at java.util.HashMap$EntryIterator.next(Unknown Source) ~[?:1.8.0_181] at java.util.HashMap$EntryIterator.next(Unknown Source) ~[?:1.8.0_181] at bnj.E(SourceFile:1162) ~[1.13.2-pre1.jar:?] at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_181] at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_181] at k.a(SourceFile:199) ~[1.13.2-pre1.jar:?] ... 5 more
Changed Description:
The bug
This is no crash, but the log shows multiple ConcurrentModificationException
while flying around in the world. Examplethattook me ~30 seconds toproduce attached in the log.[16:38:58] [Server thread/FATAL]: Error executing task java.util.concurrent.ExecutionException: java.util.ConcurrentModificationException at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_181] at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_181] at k.a(SourceFile:200) [1.13.2-pre1.jar:?] at net.minecraft.server.MinecraftServer.b(SourceFile:726) [1.13.2-pre1.jar:?] at net.minecraft.server.MinecraftServer.a(SourceFile:681) [1.13.2-pre1.jar:?] at dgh.a(SourceFile:131) [1.13.2-pre1.jar:?] at net.minecraft.server.MinecraftServer.run(SourceFile:584) [1.13.2-pre1.jar:?] at java.lang.Thread.run(Unknown Source) [?:1.8.0_181] Caused by: java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(Unknown Source) ~[?:1.8.0_181] at java.util.HashMap$EntryIterator.next(Unknown Source) ~[?:1.8.0_181] at java.util.HashMap$EntryIterator.next(Unknown Source) ~[?:1.8.0_181] at bnj.E(SourceFile:1162) ~[1.13.2-pre1.jar:?] at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_181] at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_181] at k.a(SourceFile:199) ~[1.13.2-pre1.jar:?] ... 5 moreThe bug
Converted world produce the eror below in constantly when flying around, and chunks that should get loaded are not being loaded.
The example log took me ~30 seconds to get a few erors.[16:38:58] [Server thread/FATAL]: Error executing task java.util.concurrent.ExecutionException: java.util.ConcurrentModificationException at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_181] at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_181] at k.a(SourceFile:200) [1.13.2-pre1.jar:?] at net.minecraft.server.MinecraftServer.b(SourceFile:726) [1.13.2-pre1.jar:?] at net.minecraft.server.MinecraftServer.a(SourceFile:681) [1.13.2-pre1.jar:?] at dgh.a(SourceFile:131) [1.13.2-pre1.jar:?] at net.minecraft.server.MinecraftServer.run(SourceFile:584) [1.13.2-pre1.jar:?] at java.lang.Thread.run(Unknown Source) [?:1.8.0_181] Caused by: java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(Unknown Source) ~[?:1.8.0_181] at java.util.HashMap$EntryIterator.next(Unknown Source) ~[?:1.8.0_181] at java.util.HashMap$EntryIterator.next(Unknown Source) ~[?:1.8.0_181] at bnj.E(SourceFile:1162) ~[1.13.2-pre1.jar:?] at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_181] at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_181] at k.a(SourceFile:199) ~[1.13.2-pre1.jar:?] ... 5 more
Changed Description:
The bug
Converted worlds produce the error below in constantly when flying around, and chunks that should get loaded are not being loaded.
The example log took me ~30 seconds to get a few erors.[16:38:58] [Server thread/FATAL]: Error executing task java.util.concurrent.ExecutionException: java.util.ConcurrentModificationException at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_181] at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_181] at k.a(SourceFile:200) [1.13.2-pre1.jar:?] at net.minecraft.server.MinecraftServer.b(SourceFile:726) [1.13.2-pre1.jar:?] at net.minecraft.server.MinecraftServer.a(SourceFile:681) [1.13.2-pre1.jar:?] at dgh.a(SourceFile:131) [1.13.2-pre1.jar:?] at net.minecraft.server.MinecraftServer.run(SourceFile:584) [1.13.2-pre1.jar:?] at java.lang.Thread.run(Unknown Source) [?:1.8.0_181] Caused by: java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(Unknown Source) ~[?:1.8.0_181] at java.util.HashMap$EntryIterator.next(Unknown Source) ~[?:1.8.0_181] at java.util.HashMap$EntryIterator.next(Unknown Source) ~[?:1.8.0_181] at bnj.E(SourceFile:1162) ~[1.13.2-pre1.jar:?] at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_181] at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_181] at k.a(SourceFile:199) ~[1.13.2-pre1.jar:?] ... 5 more
Changed Description:
The bug
Converted worlds produce the error below in constantly when flying around, and chunks that should get loaded are not being loaded as seen in the screenshot.
The example log took me ~30 seconds to get a few erors.[16:38:58] [Server thread/FATAL]: Error executing task java.util.concurrent.ExecutionException: java.util.ConcurrentModificationException at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_181] at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_181] at k.a(SourceFile:200) [1.13.2-pre1.jar:?] at net.minecraft.server.MinecraftServer.b(SourceFile:726) [1.13.2-pre1.jar:?] at net.minecraft.server.MinecraftServer.a(SourceFile:681) [1.13.2-pre1.jar:?] at dgh.a(SourceFile:131) [1.13.2-pre1.jar:?] at net.minecraft.server.MinecraftServer.run(SourceFile:584) [1.13.2-pre1.jar:?] at java.lang.Thread.run(Unknown Source) [?:1.8.0_181] Caused by: java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(Unknown Source) ~[?:1.8.0_181] at java.util.HashMap$EntryIterator.next(Unknown Source) ~[?:1.8.0_181] at java.util.HashMap$EntryIterator.next(Unknown Source) ~[?:1.8.0_181] at bnj.E(SourceFile:1162) ~[1.13.2-pre1.jar:?] at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_181] at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_181] at k.a(SourceFile:199) ~[1.13.2-pre1.jar:?] ... 5 more
Added Attachments:
![[Mod] Neko](../../../data/avatars/users/92901.png){kind=small}
Changed Summary:
ConcurrentModificationsExceptionspamming logConcurrentModificationException thrown when upgrading world
Added Linked Issues:
is duplicated by
Changed Description:
The bug
Converted worlds produce the error below in constantly when flying around, and chunks that should get loaded are not being loaded as seen in the screenshot.
The example log took me ~30 seconds to get a few erors.[16:38:58] [Server thread/FATAL]: Error executing task java.util.concurrent.ExecutionException: java.util.ConcurrentModificationException at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_181] at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_181] at k.a(SourceFile:200) [1.13.2-pre1.jar:?] at net.minecraft.server.MinecraftServer.b(SourceFile:726) [1.13.2-pre1.jar:?] at net.minecraft.server.MinecraftServer.a(SourceFile:681) [1.13.2-pre1.jar:?] at dgh.a(SourceFile:131) [1.13.2-pre1.jar:?] at net.minecraft.server.MinecraftServer.run(SourceFile:584) [1.13.2-pre1.jar:?] at java.lang.Thread.run(Unknown Source) [?:1.8.0_181] Caused by: java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(Unknown Source) ~[?:1.8.0_181] at java.util.HashMap$EntryIterator.next(Unknown Source) ~[?:1.8.0_181] at java.util.HashMap$EntryIterator.next(Unknown Source) ~[?:1.8.0_181] at bnj.E(SourceFile:1162) ~[1.13.2-pre1.jar:?] at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_181] at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_181] at k.a(SourceFile:199) ~[1.13.2-pre1.jar:?] ... 5 moreCode analysis by [Mod] md_5 can be found in this comment.
Changed Description:
The bug
Converted worlds produce the error below in constantly when flying around, and chunks that should get loaded are not being loaded as seen in the screenshot.
The example log took me ~30 seconds to get a few erors.[16:38:58] [Server thread/FATAL]: Error executing task java.util.concurrent.ExecutionException: java.util.ConcurrentModificationException at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_181] at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_181] at k.a(SourceFile:200) [1.13.2-pre1.jar:?] at net.minecraft.server.MinecraftServer.b(SourceFile:726) [1.13.2-pre1.jar:?] at net.minecraft.server.MinecraftServer.a(SourceFile:681) [1.13.2-pre1.jar:?] at dgh.a(SourceFile:131) [1.13.2-pre1.jar:?] at net.minecraft.server.MinecraftServer.run(SourceFile:584) [1.13.2-pre1.jar:?] at java.lang.Thread.run(Unknown Source) [?:1.8.0_181] Caused by: java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(Unknown Source) ~[?:1.8.0_181] at java.util.HashMap$EntryIterator.next(Unknown Source) ~[?:1.8.0_181] at java.util.HashMap$EntryIterator.next(Unknown Source) ~[?:1.8.0_181] at bnj.E(SourceFile:1162) ~[1.13.2-pre1.jar:?] at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_181] at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_181] at k.a(SourceFile:199) ~[1.13.2-pre1.jar:?] ... 5 moreCode analysis by [Mod] md_5 can be found in this comment.
The bug
Converted worlds produce the error below in constantly when flying around, and chunks that should get loaded are not being loaded as seen in the screenshot.
The example log took me ~30 seconds to get a few erors.[16:38:58] [Server thread/FATAL]: Error executing task java.util.concurrent.ExecutionException: java.util.ConcurrentModificationException at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_181] at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_181] at k.a(SourceFile:200) [1.13.2-pre1.jar:?] at net.minecraft.server.MinecraftServer.b(SourceFile:726) [1.13.2-pre1.jar:?] at net.minecraft.server.MinecraftServer.a(SourceFile:681) [1.13.2-pre1.jar:?] at dgh.a(SourceFile:131) [1.13.2-pre1.jar:?] at net.minecraft.server.MinecraftServer.run(SourceFile:584) [1.13.2-pre1.jar:?] at java.lang.Thread.run(Unknown Source) [?:1.8.0_181] Caused by: java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(Unknown Source) ~[?:1.8.0_181] at java.util.HashMap$EntryIterator.next(Unknown Source) ~[?:1.8.0_181] at java.util.HashMap$EntryIterator.next(Unknown Source) ~[?:1.8.0_181] at bnj.E(SourceFile:1162) ~[1.13.2-pre1.jar:?] at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_181] at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_181] at k.a(SourceFile:199) ~[1.13.2-pre1.jar:?] ... 5 moreCode analysis
Code analysis by [Mod] md_5 can be found in this comment.
Added Linked Issues:
is duplicated by
Added Assignee: ![[Mojang] Georgii Gavrichev](../../../data/avatars/users/22428.png)
[Mojang] Georgii Gavrichev
[Mojang] Georgii GavrichevAdded Fixed Versions: 18w43a
![[Mojang] Nathan Adams](../../../data/assets/gravatar/dinnerbone.png){kind=small}
Added Affects Versions: 1.13.2-pre2
Removed Affects Versions: 1.13.2-pre2
Added Fixed Versions: 1.13.2-pre2
The effect as seen in the screenshot happens with in 1.13.2-pre1 new creates worlds too.
"Future version - 1.14+" can be removed as it is fixed in 1.13.2-pre2
^^