Hi All,
Attached the process definition. I am working on a process POC which uses a parallel gateway/exclusive gateway, inclusive gateway, service tasks/user tasks and timerevent. Strangely enough the two same user task(user task1) are created. From debug, it seems that the Timer1 event has locking failure and and retried after 1 min. Stacktrace in the job failure stacktrace.
<blockcode>
org.activiti.engine.ActivitiOptimisticLockingException: JobEntity [id=7617] was updated by another transaction concurrently
at org.activiti.engine.impl.db.DbSqlSession$CheckedDeleteOperation.execute(DbSqlSession.java:286)
at org.activiti.engine.impl.db.DbSqlSession.flushRegularDeletes(DbSqlSession.java:834)
at org.activiti.engine.impl.db.DbSqlSession.flushDeletes(DbSqlSession.java:798)
at org.activiti.engine.impl.db.DbSqlSession.flush(DbSqlSession.java:595)
at org.activiti.engine.impl.interceptor.CommandContext.flushSessions(CommandContext.java:211)
at org.activiti.engine.impl.interceptor.CommandContext.close(CommandContext.java:137)
at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:66)
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.asyncexecutor.ExecuteAsyncRunnable.run(ExecuteAsyncRunnable.java:73)
</blockcode>
The two instances of the UserTask_1 are the result of two executions of the Timer1. And at the second time, there is following stacktrace.
<blockcode>
java.lang.NullPointerException: while trying to invoke the method org.activiti.engine.impl.pvm.process.ActivityImpl.isScope() of a null object loaded from local variable 'activity'
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: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.asyncexecutor.ExecuteAsyncRunnable.run(ExecuteAsyncRunnable.java:73)
</blockcode>
When I tried to complete the two userTask1 instances, I got the exceptions and unable to complete any of them.
Using:
1. Activiti 5.17.0 Async Job Executor and JBoss EAP 4.3 with JTA enabled environment.
Possible directions next steps:
1. I am using StandaloneProcessEngineConfiguration(not JtaProcessEngineConfiguration). Can this be related to the retry of jobs?
2. Will the use async job executor related? Will it be good chance to switch to non-async work?
3. Process definition issue?
4. Issue in the engine side?
5. others?
I have been working on this issue for a while and didn't get much progress of the root cause. Any information will be very helpful and appreciated!
Sincerely yours,
Michael Luo
