JBPM Locking When Accessing KieSession From Different Thread

[mr...@univeris.com]

I am doing an upgrade from JBPM 3 to 7. The Process Instances runs on a different thread,  Sometimes the UI thread needs to access the process Instance via the KIESession. If I try to execute an operation for example sending a signal the UI is blocked until the process instances finish. 

I looked further into it and the PersistableRunner.execute() is synchronized . 

FYI I am using the per-process Instance strategy.

Is there a way to get around this issue?

A snippet of thread DUMP:

default task-21@45362" prio=5 tid=0x150 nid=NA waiting for monitor entry
  java.lang.Thread.State: BLOCKED
     waiting for JBPM-Processor-5692548@955268 to release lock on <0xb176> (a org.drools.persistence.PersistableRunner)
      at org.drools.persistence.PersistableRunner.execute(PersistableRunner.java:400)
      at org.drools.persistence.PersistableRunner.execute(PersistableRunner.java:68)
      at org.drools.core.runtime.InternalLocalRunner.execute(InternalLocalRunner.java:37)
      at org.drools.core.runtime.InternalLocalRunner.execute(InternalLocalRunner.java:41)
      at org.drools.core.command.impl.CommandBasedStatefulKnowledgeSession.signalEvent(CommandBasedStatefulKnowledgeSession.java:255)
      at com.className.cancelBpmProcessing(className.java:299)

[Francisco Javier Tirado Sarti]

Hi,

Can you also include the thread that holds the lock?

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[mr...@univeris.com]

I removed company specific classes.  

java.lang.Thread.State: RUNNABLE
      at org.drools.persistence.jpa.processinstance.JPAWorkItemManager.internalExecuteWorkItem(JPAWorkItemManager.java:69)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.lambda$internalTrigger$0(WorkItemNodeInstance.java:141)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance$$Lambda$1538.1211958167.run(Unknown Source:-1)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.processWorkItemHandler(WorkItemNodeInstance.java:155)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.internalTrigger(WorkItemNodeInstance.java:141)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:207)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:415)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:393)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:424)
      at org.jbpm.workflow.instance.node.SplitInstance.executeStrategy(SplitInstance.java:116)
      at org.jbpm.workflow.instance.node.SplitInstance.internalTrigger(SplitInstance.java:62)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:207)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:415)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:393)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:362)
      at org.jbpm.workflow.instance.impl.ExtendedNodeInstanceImpl.triggerCompleted(ExtendedNodeInstanceImpl.java:59)
      at org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:417)
      at org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:377)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.triggerCompleted(WorkItemNodeInstance.java:293)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.workItemCompleted(WorkItemNodeInstance.java:380)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.signalEvent(WorkItemNodeInstance.java:350)
      at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:703)
      - locked <0xb178> (a org.jbpm.ruleflow.instance.RuleFlowProcessInstance)
      at org.drools.persistence.jpa.processinstance.JPAWorkItemManager.completeWorkItem(JPAWorkItemManager.java:171)
      at com.company.workItemHandler.executeWorkItem(workItemHandler.java:45)
      at org.drools.persistence.jpa.processinstance.JPAWorkItemManager.internalExecuteWorkItem(JPAWorkItemManager.java:69)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.lambda$internalTrigger$0(WorkItemNodeInstance.java:141)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance$$Lambda$1538.1211958167.run(Unknown Source:-1)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.processWorkItemHandler(WorkItemNodeInstance.java:155)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.internalTrigger(WorkItemNodeInstance.java:141)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:207)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:415)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:393)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:362)
      at org.jbpm.workflow.instance.impl.ExtendedNodeInstanceImpl.triggerCompleted(ExtendedNodeInstanceImpl.java:59)
      at org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:417)
      at org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:377)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.triggerCompleted(WorkItemNodeInstance.java:293)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.workItemCompleted(WorkItemNodeInstance.java:380)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.signalEvent(WorkItemNodeInstance.java:350)
      at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:703)
      at org.drools.persistence.jpa.processinstance.JPAWorkItemManager.completeWorkItem(JPAWorkItemManager.java:171)
      at com.company.workItemHandler.executeWorkItem(workItemHandler.java:45)
      at org.drools.persistence.jpa.processinstance.JPAWorkItemManager.internalExecuteWorkItem(JPAWorkItemManager.java:69)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.lambda$internalTrigger$0(WorkItemNodeInstance.java:141)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance$$Lambda$1538.1211958167.run(Unknown Source:-1)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.processWorkItemHandler(WorkItemNodeInstance.java:155)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.internalTrigger(WorkItemNodeInstance.java:141)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:207)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:415)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:393)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:362)
      at org.jbpm.workflow.instance.impl.ExtendedNodeInstanceImpl.triggerCompleted(ExtendedNodeInstanceImpl.java:59)
      at org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:417)
      at org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:377)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.triggerCompleted(WorkItemNodeInstance.java:293)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.workItemCompleted(WorkItemNodeInstance.java:380)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.signalEvent(WorkItemNodeInstance.java:350)
      at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:703)
      at org.drools.persistence.jpa.processinstance.JPAWorkItemManager.completeWorkItem(JPAWorkItemManager.java:171)
      at com.company.workItemHandler.executeWorkItem(workItemHandler.java:45)
      at org.drools.persistence.jpa.processinstance.JPAWorkItemManager.internalExecuteWorkItem(JPAWorkItemManager.java:69)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.lambda$internalTrigger$0(WorkItemNodeInstance.java:141)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance$$Lambda$1538.1211958167.run(Unknown Source:-1)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.processWorkItemHandler(WorkItemNodeInstance.java:155)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.internalTrigger(WorkItemNodeInstance.java:141)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:207)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:415)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:393)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:362)
      at org.jbpm.workflow.instance.node.JoinInstance.triggerCompleted(JoinInstance.java:272)
      at org.jbpm.workflow.instance.node.JoinInstance.internalTrigger(JoinInstance.java:133)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:207)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:415)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:393)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:424)
      at org.jbpm.workflow.instance.node.SplitInstance.executeStrategy(SplitInstance.java:116)
      at org.jbpm.workflow.instance.node.SplitInstance.internalTrigger(SplitInstance.java:62)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:207)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:415)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:393)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:362)
      at org.jbpm.workflow.instance.impl.ExtendedNodeInstanceImpl.triggerCompleted(ExtendedNodeInstanceImpl.java:59)
      at org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:417)
      at org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:377)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.triggerCompleted(WorkItemNodeInstance.java:293)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.workItemCompleted(WorkItemNodeInstance.java:380)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.signalEvent(WorkItemNodeInstance.java:350)
      at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:703)
      at org.drools.persistence.jpa.processinstance.JPAWorkItemManager.completeWorkItem(JPAWorkItemManager.java:171)
      at com.company.workItemHandler.executeWorkItem(workItemHandler.java:44)
      at org.drools.persistence.jpa.processinstance.JPAWorkItemManager.internalExecuteWorkItem(JPAWorkItemManager.java:69)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.lambda$internalTrigger$0(WorkItemNodeInstance.java:141)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance$$Lambda$1538.1211958167.run(Unknown Source:-1)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.processWorkItemHandler(WorkItemNodeInstance.java:155)
      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.internalTrigger(WorkItemNodeInstance.java:141)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:207)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:415)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:393)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:362)
      at org.jbpm.workflow.instance.node.StartNodeInstance.triggerCompleted(StartNodeInstance.java:72)
      at org.jbpm.workflow.instance.node.StartNodeInstance.internalTrigger(StartNodeInstance.java:43)
      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:207)
      at org.jbpm.ruleflow.instance.RuleFlowProcessInstance.internalStart(RuleFlowProcessInstance.java:40)
      at org.jbpm.process.instance.impl.ProcessInstanceImpl.start(ProcessInstanceImpl.java:248)
      at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.start(WorkflowProcessInstanceImpl.java:559)
      at org.jbpm.process.instance.ProcessRuntimeImpl.startProcessInstance(ProcessRuntimeImpl.java:261)
      at org.jbpm.process.instance.ProcessRuntimeImpl.startProcessInstance(ProcessRuntimeImpl.java:270)
      at org.drools.core.impl.StatefulKnowledgeSessionImpl.startProcessInstance(StatefulKnowledgeSessionImpl.java:1842)
      at org.drools.core.command.runtime.process.StartProcessInstanceCommand.execute(StartProcessInstanceCommand.java:68)
      at org.drools.core.command.runtime.process.StartProcessInstanceCommand.execute(StartProcessInstanceCommand.java:31)
      at org.drools.core.fluent.impl.PseudoClockRunner.executeBatch(PseudoClockRunner.java:102)
      at org.drools.core.fluent.impl.PseudoClockRunner.executeBatches(PseudoClockRunner.java:69)
      at org.drools.core.fluent.impl.PseudoClockRunner.execute(PseudoClockRunner.java:61)
      at org.drools.core.fluent.impl.PseudoClockRunner.execute(PseudoClockRunner.java:39)
      at org.drools.core.command.impl.AbstractInterceptor.executeNext(AbstractInterceptor.java:39)
      at org.drools.persistence.PersistableRunner$TransactionInterceptor.execute(PersistableRunner.java:608)
      at org.drools.persistence.PersistableRunner$TransactionInterceptor.execute(PersistableRunner.java:568)
      at org.drools.core.command.impl.AbstractInterceptor.executeNext(AbstractInterceptor.java:39)
      at org.drools.persistence.jpa.OptimisticLockRetryInterceptor.internalExecute(OptimisticLockRetryInterceptor.java:102)
      at org.drools.persistence.jpa.OptimisticLockRetryInterceptor.execute(OptimisticLockRetryInterceptor.java:83)
      at org.drools.persistence.jpa.OptimisticLockRetryInterceptor.execute(OptimisticLockRetryInterceptor.java:44)
      at org.drools.core.command.impl.AbstractInterceptor.executeNext(AbstractInterceptor.java:39)
      at org.drools.persistence.jta.TransactionLockInterceptor.execute(TransactionLockInterceptor.java:73)
      at org.drools.persistence.jta.TransactionLockInterceptor.execute(TransactionLockInterceptor.java:45)
      at org.drools.core.command.impl.AbstractInterceptor.executeNext(AbstractInterceptor.java:39)
      at org.jbpm.runtime.manager.impl.error.ExecutionErrorHandlerInterceptor.internalExecute(ExecutionErrorHandlerInterceptor.java:66)
      at org.jbpm.runtime.manager.impl.error.ExecutionErrorHandlerInterceptor.execute(ExecutionErrorHandlerInterceptor.java:52)
      at org.jbpm.runtime.manager.impl.error.ExecutionErrorHandlerInterceptor.execute(ExecutionErrorHandlerInterceptor.java:29)
      at org.drools.persistence.PersistableRunner.execute(PersistableRunner.java:400)
      - locked <0xb176> (a org.drools.persistence.PersistableRunner)

      at org.drools.persistence.PersistableRunner.execute(PersistableRunner.java:68)
      at org.drools.core.runtime.InternalLocalRunner.execute(InternalLocalRunner.java:37)
      at org.drools.core.runtime.InternalLocalRunner.execute(InternalLocalRunner.java:41)

      at org.drools.core.command.impl.CommandBasedStatefulKnowledgeSession.startProcessInstance(CommandBasedStatefulKnowledgeSession.java:289)
      at com.className.processor(className.java:129)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethodAccessorImpl.java:-1)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:498)

[ENRIQUE GONZALEZ MARTINEZ]

Hi, You cannot avoid this as this is a mechanism to avoid multithread safety.

Cheers :)

El lun, 21 nov 2022 a las 19:12, Francisco Javier Tirado Sarti
(<ftir...@redhat.com>) escribió:

> To view this discussion on the web visit https://groups.google.com/d/msgid/jbpm-development/CABnrMOiBX0e%2BGxV45GKwqCyu3D5BfHqm2_LsgVVQ6r7wb8J2rw%40mail.gmail.com.



--
Saludos, Enrique González Martínez :)