topic Re: NPE when completing task with non-null assignee in Alfresco Archive

NPE when completing task with non-null assignee

rhafner — Mon, 01 Jul 2013 14:23:49 GMT

I'm hitting a NPE when attempting to complete a task after claiming it with a non-null userId on version 5.13. Example:taskService.claim(taskId, "user1");taskService.complete(taskId);Digging into the source a bit I see the following comment in GetIdentityLinksForTaskCmd. java suggesting this might b

Re: NPE when completing task with non-null assignee

frederikherema1 — Wed, 03 Jul 2013 10:09:16 GMT

Can you please provide the context in which the 2 service-calls are done? Our test-suite covers the use case (having an assignee on a task an completing it) like a million times, so it' definitely not a bug that is always reproduced.

Do you call the claim(…) and complete(..) from within a task-listener? By the way, the exception is coming from the "delete" of an identity-link on a process-instance, not on the task itself… So more context is needed to analyze why this is happening…

Re: NPE when completing task with non-null assignee

mederly — Wed, 30 Apr 2014 22:05:40 GMT

I've come across the same problem today. As you suggested, in my case it occurs when calling taskService.getIdentityLinksForTask(…) while processing completion event in the task listener.

I've created an issue for that: http://jira.codehaus.org/browse/ACT-2001 along with test case to demonstrate the problem.

Re: NPE when completing task with non-null assignee

vigneshbhaskar — Fri, 04 Jul 2014 06:02:59 GMT

Hi Mederly, Is this issue raised by you resolved? I upgraded my activiti from 5.12 to 5.15 and everything is breaking down. I am encountering the same issue which you have raised while trying to complete a task. The task has an attached listener which triggers my custom method named persistIdentityLink when the task is completed.

<java>

Exception in thread "main" java.lang.NullPointerException
at org.activiti.engine.impl.db.DbSqlSession$CheckedDeleteOperation.sameIdentity(DbSqlSession.java:252) at org.activiti.engine.impl.db.DbSqlSession$CheckedDeleteOperation.sameIdentity(DbSqlSession.java:252)
at org.activiti.engine.impl.db.DbSqlSession.removeUnnecessaryOperations(DbSqlSession.java:519)
at org.activiti.engine.impl.db.DbSqlSession.flush(DbSqlSession.java:483)
at org.activiti.engine.impl.interceptor.CommandContext.flushSessions(CommandContext.java:175)
at org.activiti.engine.impl.interceptor.CommandContext.close(CommandContext.java:122)
at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:66)
at org.activiti.spring.SpringTransactionInterceptor$1.doInTransaction(SpringTransactionInterceptor.java:47)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:131)
at org.activiti.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:45)
at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:37)
at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:40)
at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:35)
at org.activiti.engine.impl.TaskServiceImpl.complete(TaskServiceImpl.java:166)
at TestingActiviti.main(TestingActiviti.java:66)
at org.activiti.engine.impl.db.DbSqlSession$CheckedDeleteOperation.sameIdentity(DbSqlSession.java:252)
</java>

Re: NPE when completing task with non-null assignee

martin_grofcik — Mon, 07 Jul 2014 07:39:27 GMT

Hi,

I checked out activiti-5.15 from git. org.activiti.engine.impl.db.DbSqlSession$CheckedDeleteOperation.sameIdentity(DbSqlSession.java:252) is empty line. Do you really use 5.15.

Regards
Martin