Additional comment: Tested starting the server using a .bat file "Minecraft Server Startup.bat" with the Java command "java -Xmx1024M -Xms1024M -jar minecraft_server.14w03b.jar" and this resolved the error message because the console received input. When I used "Javaw" to start the server the error occurred.
Snapshot 14w03b also affected.
Additional comment: Tested starting the server using a .bat file "Minecraft Server Startup.bat" with the Java command "java -Xmx1024M -Xms1024M -jar minecraft_server.14w03b.jar" and this resolved the error message because the console received input. When I used "Javaw" to start the server the error occurred.