When connecting it will randomly disconnect with Internal Exception: java.io.IOException: Error while write(...): Broken pipe. If you do manage to connect then it will give the same error when changing worlds.
Game Output (in launcher):
java.util.concurrent.ExecutionException: java.lang.NullPointerException
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_60]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_60]
at g.a(SourceFile:45) [1.8.8.jar:?]
at ave.av(SourceFile:881) [1.8.8.jar:?]
at ave.a(SourceFile:325) [1.8.8.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:124) [1.8.8.jar:?]
Caused by: java.lang.NullPointerException
at bcy.a(SourceFile:890) ~[1.8.8.jar:?]
at gp.a(SourceFile:81) ~[1.8.8.jar:?]
at gp.a(SourceFile:10) ~[1.8.8.jar:?]
at fh$1.run(SourceFile:13) ~[1.8.8.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_60]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_60]
at g.a(SourceFile:44) ~[1.8.8.jar:?]
... 3 more
[16:50:11] [Client thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NullPointerException
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_60]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_60]
at g.a(SourceFile:45) [1.8.8.jar:?]
at ave.av(SourceFile:881) [1.8.8.jar:?]
at ave.a(SourceFile:325) [1.8.8.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:124) [1.8.8.jar:?]
Caused by: java.lang.NullPointerException
at bcy.a(SourceFile:811) ~[1.8.8.jar:?]
at hw.a(SourceFile:46) ~[1.8.8.jar:?]
at hw.a(SourceFile:11) ~[1.8.8.jar:?]
at fh$1.run(SourceFile:13) ~[1.8.8.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_60]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_60]
at g.a(SourceFile:44) ~[1.8.8.jar:?]
... 3 more
[16:50:11] [Client thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NullPointerException
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_60]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_60]
at g.a(SourceFile:45) [1.8.8.jar:?]
at ave.av(SourceFile:881) [1.8.8.jar:?]
at ave.a(SourceFile:325) [1.8.8.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:124) [1.8.8.jar:?]
Caused by: java.lang.NullPointerException
at bcy.a(SourceFile:811) ~[1.8.8.jar:?]
at hw.a(SourceFile:46) ~[1.8.8.jar:?]
at hw.a(SourceFile:11) ~[1.8.8.jar:?]
at fh$1.run(SourceFile:13) ~[1.8.8.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_60]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_60]
at g.a(SourceFile:44) ~[1.8.8.jar:?]
... 3 more
[16:50:11] [Client thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NullPointerException
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_60]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_60]
at g.a(SourceFile:45) [1.8.8.jar:?]
at ave.av(SourceFile:881) [1.8.8.jar:?]
at ave.a(SourceFile:325) [1.8.8.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:124) [1.8.8.jar:?]
Caused by: java.lang.NullPointerException
at bcy.a(SourceFile:811) ~[1.8.8.jar:?]
at hw.a(SourceFile:46) ~[1.8.8.jar:?]
at hw.a(SourceFile:11) ~[1.8.8.jar:?]
at fh$1.run(SourceFile:13) ~[1.8.8.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_60]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_60]
at g.a(SourceFile:44) ~[1.8.8.jar:?]
... 3 more
[16:50:12] [Client thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NullPointerException
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_60]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_60]
at g.a(SourceFile:45) [1.8.8.jar:?]
at ave.av(SourceFile:881) [1.8.8.jar:?]
at ave.a(SourceFile:325) [1.8.8.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:124) [1.8.8.jar:?]
Caused by: java.lang.NullPointerException
at bcy.a(SourceFile:811) ~[1.8.8.jar:?]
at hw.a(SourceFile:46) ~[1.8.8.jar:?]
at hw.a(SourceFile:11) ~[1.8.8.jar:?]
at fh$1.run(SourceFile:13) ~[1.8.8.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_60]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_60]
at g.a(SourceFile:44) ~[1.8.8.jar:?]
... 3 more
I have restarted and reinstalled java and minecraft several times and it does not fix the issue.
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Is this still an issue in the most recent versions (i.e. 1.10.2, or 16w42a) of Minecraft?