hook plugin returns null

[ghost]

I am using stash 3.6.1 and have a shell script to be triggered as a pre-receive hook via the external hook plugin.
I am getting this message and the push is failing:
Writing objects: 100% (8/8), 670 bytes | 0 bytes/s, done.
Total 8 (delta 6), reused 0 (delta 0)
remote: Hook com.ngs.stash.externalhooks.hook.ExternalPreReceiveHook failed. Error:
remote: null
To ssh://git@:7999/hpln/backend.git
! [remote rejected] BudIceEverGreen -> BudIceEverGreen (pre-receive hook declined)
error: failed to push some refs to 'ssh://git@

from the log we can see there is an exception being thrown:

2015-02-11 19:17:45,652 WARN [threadpool:thread-5] Access key user (romanog@ROMANOG9) @1QZZ33Kx1157x519x0 95s4cq 16.60.202.173 SSH - gi
t-receive-pack '/hpln/backend.git' c.a.s.i.h.r.PreReceiveRepositoryHookAdapter Receive Hook com.ngs.stash.externalhooks.hook.ExternalPre
ReceiveHook failed.
java.lang.NullPointerException: null
at java.lang.ProcessEnvironment.validateValue(ProcessEnvironment.java:119) ~[na:1.7.0_65]
at java.lang.ProcessEnvironment.access$400(ProcessEnvironment.java:61) ~[na:1.7.0_65]
at java.lang.ProcessEnvironment$Value.valueOf(ProcessEnvironment.java:202) ~[na:1.7.0_65]
at java.lang.ProcessEnvironment$StringEnvironment.put(ProcessEnvironment.java:241) ~[na:1.7.0_65]
at java.lang.ProcessEnvironment$StringEnvironment.put(ProcessEnvironment.java:220) ~[na:1.7.0_65]
at com.ngs.stash.externalhooks.hook.ExternalPreReceiveHook.onReceive(ExternalPreReceiveHook.java:81) ~[na:na]
at com.atlassian.stash.internal.hook.repository.PreReceiveRepositoryHookAdapter$1.visit(PreReceiveRepositoryHookAdapter.java:38)
[stash-service-impl-3.6.1.jar:na]
at com.atlassian.stash.internal.hook.repository.PreReceiveRepositoryHookAdapter$1.visit(PreReceiveRepositoryHookAdapter.java:33)
[stash-service-impl-3.6.1.jar:na]
at com.atlassian.stash.internal.hook.repository.DefaultRepositoryHookService$RepositoryHookPagedTransactionCallback.doInTransact
ion(DefaultRepositoryHookService.java:616) [stash-service-impl-3.6.1.jar:na]
at com.atlassian.stash.internal.hook.repository.DefaultRepositoryHookService$RepositoryHookPagedTransactionCallback.doInTransact
ion(DefaultRepositoryHookService.java:592) [stash-service-impl-3.6.1.jar:na]
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:133) [spring-tx-4.1.1.RELEASE.ja
r:4.1.1.RELEASE]
at com.atlassian.stash.internal.hook.repository.DefaultRepositoryHookService.visitEnabledHooks(DefaultRepositoryHookService.java
:304) [stash-service-impl-3.6.1.jar:na]
at com.atlassian.stash.internal.plugin.OsgiSafeProxyProvider$1.invoke(OsgiSafeProxyProvider.java:93) [stash-platform-3.6.1.jar:na]
at com.atlassian.stash.internal.hook.repository.PreReceiveRepositoryHookAdapter.onReceive(PreReceiveRepositoryHookAdapter.java:3
3) [stash-service-impl-3.6.1.jar:na]
at com.atlassian.stash.internal.hook.DefaultBuiltInHookHandlerFactory$1.handle(DefaultBuiltInHookHandlerFactory.java:43) [stash-
service-impl-3.6.1.jar:na]
at com.atlassian.stash.internal.hook.DefaultHookService.doHandleRequest(DefaultHookService.java:341) [stash-service-impl-3.6.1.j
ar:na]
at com.atlassian.stash.internal.hook.DefaultHookService.handleRequest(DefaultHookService.java:327) [stash-service-impl-3.6.1.jar
:na]
at com.atlassian.stash.internal.hook.DefaultHookService.handleRawRequest(DefaultHookService.java:238) [stash-service-impl-3.6.1.
jar:na]
at com.atlassian.stash.internal.hook.DefaultHookService$2$1.run(DefaultHookService.java:204) [stash-service-impl-3.6.1.jar:na]
at com.atlassian.stash.internal.concurrent.StateTransferringExecutor$StateTransferringRunnable.run(StateTransferringExecutor.jav
a:69) [stash-platform-3.6.1.jar:na]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [na:1.7.0_65]
at java.util.concurrent.FutureTask.run(FutureTask.java:262) [na:1.7.0_65]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178) [na:1.7
.0_65]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292) [na:1.7.0_65]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_65]

[seletskiy]

Looks like code fails at getting e-mail address of user performing push.

It shouldn't fail anyway, but just now you can try to check in your profile that e-mail is set.

[netzmensch]

I am getting the same error. As you mentioned, I checked for the correct email but it does not help. I get this error every time i do a git push. Do you have another workaround?

[seletskiy]

@netzmensch: Hm, that's really strange. As far as I can see in backtrace, code failed at currentUser.getEmailAddress() call.

Try to use following release: https://github.com/ngsru/atlassian-external-hooks/releases/download/v2.1/external-hooks-2.1-1.jar

I've added branch for email-value validation.

[peterloron]

I'm also seeing this. In my case I'm using Jenkins to try and push a tag commit back to the Stash server. Using the 2.1-1 build resolves the issue.

[netzmensch]

@seletskiy yeah, it worked. thank you very much!

[seletskiy]

Released at marketplace as version 2.2-1.

[ghost]

thanks a lot. all is ok now.