Null Pointer Exception when executing parallel fork service

[vram]

Hi,

When trying to execute the work flow as below with service tasks , I get a null pointer exception as :

java.lang.NullPointerException
   at org.activiti.engine.impl.pvm.runtime.AtomicOperationTransitionCreateScope.execute(AtomicOperationTransitionCreateScope.java:34)
   at org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:76)
   at org.activiti.engine.impl.jobexecutor.AsyncContinuationJobHandler.execute(AsyncContinuationJobHandler.java:35)
   at org.activiti.engine.impl.persistence.entity.JobEntity.execute(JobEntity.java:78)
   at org.activiti.engine.impl.persistence.entity.MessageEntity.execute(MessageEntity.java:31)
   at org.activiti.engine.impl.cmd.ExecuteJobsCmd.execute(ExecuteJobsCmd.java:61)
   at org.activiti.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:24)
   at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:42)
   at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:33)
   at org.activiti.engine.impl.jobexecutor.ExecuteJobsRunnable.run(ExecuteJobsRunnable.java:36)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
   at java.lang.Thread.run(Unknown Source)

When I use a script task in places of service task in above, I do not get any exceptions and the work flow completes to success. Any pointers would greatly help me…

Thanks

[frederikherema1]

I presume you're running the tasks asynchronously, non-exclusive now? Again, it's recommended to join the two flows again and also take into account http://activiti.org/userguide/index.html#exclusiveJobs.

What I presume that is happening, is that both service-tasks are executed at the same time, and both updating the main process-instance.

[vram]

Thanks a lot frederikheremans for your recommendation.

After the locking exception in the retry again I see this exception :

java.lang.NullPointerException
at org.activiti.engine.impl.pvm.runtime.AtomicOperationTransitionCreateScope.execute(AtomicOperationTransitionCreateScope.java:34)
at org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:76)
at org.activiti.engine.impl.jobexecutor.AsyncContinuationJobHandler.execute(AsyncContinuationJobHandler.java:35)
at org.activiti.engine.impl.persistence.entity.JobEntity.execute(JobEntity.java:78)
at org.activiti.engine.impl.persistence.entity.MessageEntity.execute(MessageEntity.java:31)
at org.activiti.engine.impl.cmd.ExecuteJobsCmd.execute(ExecuteJobsCmd.java:61)
at org.activiti.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:24)
at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:42)
at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:33)
at org.activiti.engine.impl.jobexecutor.ExecuteJobsRunnable.run(ExecuteJobsRunnable.java:36)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)


Is this also a effect of not using a join ?

[frederikherema1]

Not really sure what is happening here… The line the NPE occur on contains this:


ActivityImpl activity = (ActivityImpl) execution.getActivity();

So execution is null, which generally means bad news. Can you create a failing unit-test showing this behavior, so I can see the full test and process that is causing this?

[michael_amann]

Hi frederikheremans,

I am facing the same issue as discussed here.

Whenever I throw a RuntimeException within the ServiceTask (called via Expression) and then try to recover from this error by signaling the execution, I see the following NPE from the line:

    SignallableActivityBehavior activityBehavior = (SignallableActivityBehavior) activity.getActivityBehavior();

Stack trace:

java.lang.NullPointerException
at org.activiti.engine.impl.persistence.entity.ExecutionEntity.signal(ExecutionEntity.java:362)
at org.activiti.engine.impl.cmd.SignalCmd.execute(SignalCmd.java:60)
at org.activiti.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:24)
at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:42)
at org.activiti.spring.SpringTransactionInterceptor$1.doInTransaction(SpringTransactionInterceptor.java:42)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:130)
at org.activiti.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:40)
at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:33)
at org.activiti.engine.impl.RuntimeServiceImpl.signal(RuntimeServiceImpl.java:137)
…

It would be great if you could give me a hint on how to continue the process or even better, retry and continue.

Thanks
Michael

[lior1]

Hi Michael,

I'm facing the same issue. Did you manage to solve the problem or workaround it?

Thanks,

Lior

[frederikherema1]

Try using a parrallel-gateway (join) after the 2 paths…

[javacorner]

Hi frederikheremans,
please find the attached diagram
I face same error
I do not know how to join tasks in the diagram ?

<code>
Tue Sep 15 12:23:34 2015 ERROR JobRetryCmd - activitiy or FailedJobRetryTimerCycleValue is null in job 127997'. only decrementing retries.
Tue Sep 15 12:23:34 2015 ERROR InmaEventListener - ACTIVITI The execution of a job has failed. EntityId=127997 ,JobHandlerType=async-continuation ,ProcessInstanceId=127994
Tue Sep 15 12:23:34 2015 ERROR InmaEventListener - ACTIVITI The execution of a job has failed. EntityId=127997 ,JobHandlerType=async-continuation ,ProcessInstanceId=127994
Tue Sep 15 12:23:34 2015 ERROR ExecuteAsyncRunnable - Job 127997 failed
java.lang.NullPointerException
at org.activiti.engine.impl.pvm.runtime.AtomicOperationTransitionCreateScope.execute(AtomicOperationTransitionCreateScope.java:35)
at org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:96)
at org.activiti.engine.impl.jobexecutor.AsyncContinuationJobHandler.execute(AsyncContinuationJobHandler.java:35)
at org.activiti.engine.impl.persistence.entity.JobEntity.execute(JobEntity.java:84)
at org.activiti.engine.impl.persistence.entity.MessageEntity.execute(MessageEntity.java:29)
at org.activiti.engine.impl.cmd.ExecuteAsyncJobCmd.execute(ExecuteAsyncJobCmd.java:52)
at org.activiti.engine.impl.interceptor.CommandInvoker.execute(CommandInvoker.java:24)
at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:57)
at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:31)
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.asyncexecutor.ExecuteAsyncRunnable.run(ExecuteAsyncRunnable.java:73)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1157)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:627)
at java.lang.Thread.run(Thread.java:801)</code>

[javacorner]

Dears
is this is a bug that fixed at 5.18?

I found at re;lease notes [http://www.activiti.org/readme.html] the following
Bug:
[ACT-2194] - NPE when using parallel multi-instance on embedded subprocess