[jboss-user] [JBoss jBPM] - [JBPM4 Error]Getting error while 2 tasks are created on same

[sushantgupta402]

I have a process as below
(Start -> Task-1(Assign it to User1) -> Task-2(Assign it to User2) -> Task-3 (Assign to User 3) -> End.
I started the process instance and then signalled the it from Start to Task-1 a task is generated for User1 (checked in the database). Now I signalled the process again and the process got moved ahead to Task-2 and a new task is created for User2 now when I signalled the process instance again got the error org.hibernate.NonUniqueResultException: query did not return a unique result: 2. Below is the stack trace. Please let me know if this is a bug and when can we expect this to be fixed.

### EXCEPTION ###########################################
17:56:46,189 INF | [DefaultCommandService] exception while executing command org.jbpm.pvm.internal.cmd.SignalCmd at 1971eb3
org.hibernate.NonUniqueResultException: query did not return a unique result: 2
	at org.hibernate.impl.AbstractQueryImpl.uniqueElement(AbstractQueryImpl.java:844)
	at org.hibernate.impl.AbstractQueryImpl.uniqueResult(AbstractQueryImpl.java:835)
	at org.jbpm.pvm.internal.hibernate.DbSessionImpl.findTaskByExecution(DbSessionImpl.java:382)
	at org.jbpm.jpdl.internal.activity.TaskActivity.signal(TaskActivity.java:115)
	at org.jbpm.jpdl.internal.activity.TaskActivity.signal(TaskActivity.java:101)
	at org.jbpm.pvm.internal.model.op.Signal.perform(Signal.java:68)
	at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperationSync(ExecutionImpl.java:637)
	at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperation(ExecutionImpl.java:597)
	at org.jbpm.pvm.internal.model.ExecutionImpl.signal(ExecutionImpl.java:398)
	at org.jbpm.pvm.internal.cmd.SignalCmd.execute(SignalCmd.java:61)
	at org.jbpm.pvm.internal.cmd.SignalCmd.execute(SignalCmd.java:35)
	at org.jbpm.pvm.internal.svc.DefaultCommandService.execute(DefaultCommandService.java:42)
	at org.jbpm.pvm.internal.tx.StandardTransactionInterceptor.execute(StandardTransactionInterceptor.java:54)
	at org.jbpm.pvm.internal.svc.EnvironmentInterceptor.execute(EnvironmentInterceptor.java:54)
	at org.jbpm.pvm.internal.svc.RetryInterceptor.execute(RetryInterceptor.java:55)
	at org.jbpm.pvm.internal.svc.ExecutionServiceImpl.signalExecutionById(ExecutionServiceImpl.java:88)
	at ForkClass.main(ForkClass.java:45)
### EXCEPTION ###########################################
Exception in thread "main" org.hibernate.NonUniqueResultException: query did not return a unique result: 2
	at org.hibernate.impl.AbstractQueryImpl.uniqueElement(AbstractQueryImpl.java:844)
	at org.hibernate.impl.AbstractQueryImpl.uniqueResult(AbstractQueryImpl.java:835)
	at org.jbpm.pvm.internal.hibernate.DbSessionImpl.findTaskByExecution(DbSessionImpl.java:382)
	at org.jbpm.jpdl.internal.activity.TaskActivity.signal(TaskActivity.java:115)
	at org.jbpm.jpdl.internal.activity.TaskActivity.signal(TaskActivity.java:101)
	at org.jbpm.pvm.internal.model.op.Signal.perform(Signal.java:68)
	at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperationSync(ExecutionImpl.java:637)
	at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperation(ExecutionImpl.java:597)
	at org.jbpm.pvm.internal.model.ExecutionImpl.signal(ExecutionImpl.java:398)
	at org.jbpm.pvm.internal.cmd.SignalCmd.execute(SignalCmd.java:61)
	at org.jbpm.pvm.internal.cmd.SignalCmd.execute(SignalCmd.java:35)
	at org.jbpm.pvm.internal.svc.DefaultCommandService.execute(DefaultCommandService.java:42)
	at org.jbpm.pvm.internal.tx.StandardTransactionInterceptor.execute(StandardTransactionInterceptor.java:54)
	at org.jbpm.pvm.internal.svc.EnvironmentInterceptor.execute(EnvironmentInterceptor.java:54)
	at org.jbpm.pvm.internal.svc.RetryInterceptor.execute(RetryInterceptor.java:55)
	at org.jbpm.pvm.internal.svc.ExecutionServiceImpl.signalExecutionById(ExecutionServiceImpl.java:88)
	at ForkClass.main(ForkClass.java:45)

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