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.signal...@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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