When entering a world in Realms or a server the console sometimes gets spammed with:
1.8.2-pre6
[10:11:14] [Client thread/INFO]: Setting user: Kumasasa
[10:11:14] [Client thread/INFO]: (Session ID is token:b169d5f70d1746778d0293048e5e0917:212c6adb6aad4b04ab210d52a98931c0)
[10:11:16] [Client thread/INFO]: LWJGL Version: 2.9.3
[10:11:17] [Client thread/INFO]: Reloading ResourceManager: Default
[10:11:17] [Sound Library Loader/INFO]: Starting up SoundSystem...
[10:11:18] [Thread-6/INFO]: Initializing LWJGL OpenAL
[10:11:18] [Thread-6/INFO]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
[10:11:18] [Thread-6/INFO]: OpenAL initialized.
[10:11:18] [Sound Library Loader/INFO]: Sound engine started
[10:11:22] [Client thread/INFO]: Created: 512x512 textures-atlas
[10:11:32] [Client thread/INFO]: Realms library version == 1.7.8-pre2
[10:11:33] [MCO Availability Checker #1/INFO]: Realms is available for this user
[10:11:57] [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_25]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_25]
at h.a(SourceFile:61) [1.8.2-pre6.jar:?]
at avf.au(SourceFile:878) [1.8.2-pre6.jar:?]
at avf.a(SourceFile:323) [1.8.2-pre6.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:124) [1.8.2-pre6.jar:?]
Caused by: java.lang.NullPointerException
at gw.a(SourceFile:153) ~[1.8.2-pre6.jar:?]
at bcz.a(SourceFile:355) ~[1.8.2-pre6.jar:?]
at gw.a(SourceFile:144) ~[1.8.2-pre6.jar:?]
at gw$b.a(SourceFile:21) ~[1.8.2-pre6.jar:?]
at fi$1.run(SourceFile:13) ~[1.8.2-pre6.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_25]
at h.a(SourceFile:60) ~[1.8.2-pre6.jar:?]
... 3 more
[10:11:57] [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_25]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_25]
at h.a(SourceFile:61) [1.8.2-pre6.jar:?]
at avf.au(SourceFile:878) [1.8.2-pre6.jar:?]
at avf.a(SourceFile:323) [1.8.2-pre6.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:124) [1.8.2-pre6.jar:?]
Caused by: java.lang.NullPointerException
at hg.a(SourceFile:42) ~[1.8.2-pre6.jar:?]
at bcz.a(SourceFile:374) ~[1.8.2-pre6.jar:?]
at hg.a(SourceFile:38) ~[1.8.2-pre6.jar:?]
at hg.a(SourceFile:11) ~[1.8.2-pre6.jar:?]
at fi$1.run(SourceFile:13) ~[1.8.2-pre6.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_25]
at h.a(SourceFile:60) ~[1.8.2-pre6.jar:?]
... 3 more
[10:11:57] [Client thread/FATAL]: Error executing task
1.8.2-pre7
[17:59:49] [Client thread/INFO]: Setting user: Kumasasa
[17:59:49] [Client thread/INFO]: (Session ID is token:c4cef29a5ab94c5f97380f862ce93d68:212c6adb6aad4b04ab210d52a98931c0)
[17:59:51] [Client thread/INFO]: LWJGL Version: 2.9.4
[17:59:53] [Client thread/INFO]: Reloading ResourceManager: Default, Misa Patch Les 1.8.zip, Misa.zip, XDBMisaPatchV1.4.zip
[17:59:53] [Client thread/WARN]: ResourcePack: ignored non-lowercase namespace: %s in %s
[17:59:56] [Sound Library Loader/INFO]: Starting up SoundSystem...
[17:59:57] [Thread-6/INFO]: Initializing LWJGL OpenAL
[17:59:57] [Thread-6/INFO]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
[17:59:57] [Thread-6/INFO]: OpenAL initialized.
[17:59:57] [Sound Library Loader/INFO]: Sound engine started
[18:00:20] [Client thread/INFO]: Created: 2048x2048 textures-atlas
[18:00:43] [Client thread/INFO]: Realms library version == 1.7.8-pre3
[18:00:44] [MCO Availability Checker #1/INFO]: Realms is available for this user
[18:00:54] [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_25]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_25]
at h.a(SourceFile:61) [1.8.2-pre7.jar:?]
at avf.au(SourceFile:878) [1.8.2-pre7.jar:?]
at avf.a(SourceFile:323) [1.8.2-pre7.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:124) [1.8.2-pre7.jar:?]
Caused by: java.lang.NullPointerException
at gj.a(SourceFile:42) ~[1.8.2-pre7.jar:?]
at bcz.a(SourceFile:655) ~[1.8.2-pre7.jar:?]
at gj.a(SourceFile:38) ~[1.8.2-pre7.jar:?]
at gj.a(SourceFile:11) ~[1.8.2-pre7.jar:?]
at fi$1.run(SourceFile:13) ~[1.8.2-pre7.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_25]
at h.a(SourceFile:60) ~[1.8.2-pre7.jar:?]
... 3 more
[18:00:54] [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_25]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_25]
at h.a(SourceFile:61) [1.8.2-pre7.jar:?]
at avf.au(SourceFile:878) [1.8.2-pre7.jar:?]
at avf.a(SourceFile:323) [1.8.2-pre7.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:124) [1.8.2-pre7.jar:?]
Caused by: java.lang.NullPointerException
at hg.a(SourceFile:42) ~[1.8.2-pre7.jar:?]
at bcz.a(SourceFile:374) ~[1.8.2-pre7.jar:?]
at hg.a(SourceFile:38) ~[1.8.2-pre7.jar:?]
at hg.a(SourceFile:11) ~[1.8.2-pre7.jar:?]
at fi$1.run(SourceFile:13) ~[1.8.2-pre7.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_25]
at h.a(SourceFile:60) ~[1.8.2-pre7.jar:?]
... 3 more
[18:03:35] [Client thread/INFO]: Stopping!
[18:03:35] [Client thread/INFO]: SoundSystem shutting down...
[18:03:36] [Client thread/WARN]: Author: Paul Lamb, www.paulscode.com
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release
[23:23:12] [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_25]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_25]
at g.a(SourceFile:61) [1.8.7.jar:?]
at ave.av(SourceFile:880) [1.8.7.jar:?]
at ave.a(SourceFile:325) [1.8.7.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:124) [1.8.7.jar:?]
Caused by: java.lang.NullPointerException
at gv.a(SourceFile:153) ~[1.8.7.jar:?]
at bcy.a(SourceFile:355) ~[1.8.7.jar:?]
at gv.a(SourceFile:144) ~[1.8.7.jar:?]
at gv$a.a(SourceFile:61) ~[1.8.7.jar:?]
at fh$1.run(SourceFile:13) ~[1.8.7.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_25]
at g.a(SourceFile:60) ~[1.8.7.jar:?]
... 3 more
[23:23:12] [Client thread/FATAL]: Error executing task
1.8.8
[22:50:38] [Client thread/INFO]: Realms library version == 1.7.31
[22:50:40] [MCO Availability Checker #1/INFO]: Realms is available for this user
...
[23:53:39] [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_25]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_25]
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:277) ~[1.8.8.jar:?]
at hm.a(SourceFile:66) ~[1.8.8.jar:?]
at hm.a(SourceFile:9) ~[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_25]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_25]
at g.a(SourceFile:44) ~[1.8.8.jar:?]
... 3 more
[23:53:39] [Client thread/FATAL]: Error executing task
Have no clear steps to reproduce, happens sometimes and sometimes not.
Linked issues
is duplicated by 11
relates to 1
Comments 6


Can confirm happens in 15w51b, was not able to reproduce with subsequent connections.
This message is repeated over a hundred times in the launcher console output when connecting to a server I own:
15w51b
[06:27:56] [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_25]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_25]
at g.a(SourceFile:46) [15w51b.jar:?]
at bcb.as(SourceFile:934) [15w51b.jar:?]
at bcb.a(SourceFile:386) [15w51b.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:122) [15w51b.jar:?]
Caused by: java.lang.NullPointerException
at hg.a(SourceFile:42) ~[15w51b.jar:?]
at bkh.a(SourceFile:516) ~[15w51b.jar:?]
at hg.a(SourceFile:38) ~[15w51b.jar:?]
at hg.a(SourceFile:11) ~[15w51b.jar:?]
at fh$1.run(SourceFile:13) ~[15w51b.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_25]
at g.a(SourceFile:45) ~[15w51b.jar:?]
... 3 more
[06:27:56] [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_25]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_25]
at g.a(SourceFile:46) [15w51b.jar:?]
at bcb.as(SourceFile:934) [15w51b.jar:?]
at bcb.a(SourceFile:386) [15w51b.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:122) [15w51b.jar:?]
Caused by: java.lang.NullPointerException
at gu.a(SourceFile:153) ~[15w51b.jar:?]
at bkh.a(SourceFile:497) ~[15w51b.jar:?]
at gu.a(SourceFile:144) ~[15w51b.jar:?]
at gu$b.a(SourceFile:21) ~[15w51b.jar:?]
at fh$1.run(SourceFile:13) ~[15w51b.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_25]
at g.a(SourceFile:45) ~[15w51b.jar:?]
... 3 more
Client System Environment:
MC 15w51b
Java 8 Update 25
Windows 8.1 64bit
AMD FX6300 3.5GHz 6-core cpu
12GB ram, 1GB allocated to client
AMD r9 280 gpu
Server System Environment:
MC 15w51b
Can't remember the specific java version, but should be latest Java 8 stable release as of 3 days ago
Ubuntu 14.04 64bit VPS
2GB ram, 1.5gb allocated to server
Intel Xeon e3 cpu, 1 core granted

This also happens in singleplayer.

Yes, it's not really a difference.

Is this still an issue in the latest snapshot 16w44a? If so please update the affected versions.
This is an automated comment on any open or reopened issue with out-of-date affected versions.

Is this still a issue in the latest version of the game(currently 1.13.1)?
If so, please add it to the affected versions, thanks!
I got almost the same exception couple times a second (untill it crashes), while playing normal multi player.
[17:08:57] [Client thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NullPointerException
at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_40-ea]
at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_40-ea]
at h.a(SourceFile:61) [1.8.3.jar:?]
at avf.av(SourceFile:880) [1.8.3.jar:?]
at avf.a(SourceFile:325) [1.8.3.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:124) [1.8.3.jar:?]
Caused by: java.lang.NullPointerException
at bcz.a(SourceFile:301) ~[1.8.3.jar:?]
at fq.a(SourceFile:75) ~[1.8.3.jar:?]
at fq.a(SourceFile:16) ~[1.8.3.jar:?]
at fi$1.run(SourceFile:13) ~[1.8.3.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_40-ea]
at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_40-ea]
at h.a(SourceFile:60) ~[1.8.3.jar:?]
... 3 more
AL lib: (EE) alc_cleanup: 1 device not closed