[jboss-user] [jBPM] - jBPM5.3 LocalHumanTaskService

[hua zhong]

hua zhong [https://community.jboss.org/people/ghuazh] created the discussion

"jBPM5.3 LocalHumanTaskService"

To view the discussion, visit: https://community.jboss.org/message/739520#739520

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Hi, all
I'm using jBPM5.3 final in our project, and  try to use local human task handler.
I got too many problems need someone help me.

1. to start a process:

Map<String, Object> params = new HashMap<String, Object>();
params.put("act_rule_launcher", "krisv");
params.put("act_rule_dept_manager", "john");
params.put("act_checker", "mary");
params.put("act_approver", "tracy");
  
StatefulKnowledgeSession ksession = BPM.getBPMService().getSession("com.tmt");
HTWorkItemHandler handler = new HTWorkItemHandler(ksession);
ksession.getWorkItemManager().registerWorkItemHandler("Human Task", handler);
ksession.startProcess("com.tmt.ProjectPlanApproval", params);

HTWorkItemHandler is a local work item extends AbstractHTWorkItemHandler.

Exception: 
0    03/06 18:06:18,379[UIThread [1gpcqnco5rnu6n5d7u3otffrb]] ERROR hibernate.transaction.JDBCTransaction.toggleAutoCommit  - Could not toggle autocommit
java.sql.SQLException: autocommit is not allowed on a resource enlisted in a global transaction
    at bitronix.tm.resource.jdbc.JdbcConnectionHandle.setAutoCommit(JdbcConnectionHandle.java:177)
    at sun.reflect.GeneratedMethodAccessor14.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)


I guess maybe I need to change persistence.xml to use JTA?
<persistence-unit name="org.jbpm.task"> 
change to:
<persistence-unit name="org.jbpm.task" transaction-type="JTA"> 

After that, It's ok. but soon I got the 2nd problem, see below.

2. complete a task
HTTaskService service = BPM.getHumanTaskService().getTaskService();
List<TaskSummary> tasks = service.getTasksAssignedAsPotentialOwner(userId,"en-UK");
if(tasks.isEmpty()){
 return;
}
for(int i =0;i<tasks.size();i++){
 TaskSummary task = tasks.get(i);
 System.out.println(userId+">>"+task.getId()+task.getName());
}
long taskId = tasks.get(0).getId();
service.start(taskId, userId);
service.complete(taskId, userId,null);

HTTaskService is a taskservice extends LocalTaskService.
BPM.getHumanTaskService().getTaskService() will return a new HTTaskService from a org.jbpm.task.service.TaskService.
in my application only one org.jbpm.task.service.TaskService will created, every HTTaskService whil use it.

service.start is ok.
but when service complete, it brings a new exception:

javax.persistence.TransactionRequiredException: No active JTA transaction on joinTransaction call
    at org.hibernate.ejb.AbstractEntityManagerImpl.joinTransaction(AbstractEntityManagerImpl.java:458)
    at org.hibernate.ejb.AbstractEntityManagerImpl.joinTransaction(AbstractEntityManagerImpl.java:431)
    at org.drools.persistence.jpa.JpaPersistenceContextManager.beginCommandScopedEntityManager(JpaPersistenceContextManager.java:83)
    at org.jbpm.persistence.processinstance.JPAProcessInstanceManager.getProcessInstance(JPAProcessInstanceManager.java:75)
    at org.jbpm.process.instance.ProcessRuntimeImpl.getProcessInstance(ProcessRuntimeImpl.java:204)
    at org.drools.common.AbstractWorkingMemory.getProcessInstance(AbstractWorkingMemory.java:1100)
    at org.drools.impl.StatefulKnowledgeSessionImpl.getProcessInstance(StatefulKnowledgeSessionImpl.java:297)
    at org.drools.persistence.jpa.processinstance.JPAWorkItemManager.completeWorkItem(JPAWorkItemManager.java:117)
    at com.sg.bpm.service.task.HTWorkItemHandler$TaskCompletedHandler.execute(HTWorkItemHandler.java:165)
    at org.jbpm.task.service.local.LocalTaskService$SimpleEventTransport.trigger(LocalTaskService.java:307)
    at org.jbpm.task.event.MessagingTaskEventListener.taskCompleted(MessagingTaskEventListener.java:73)
    at org.jbpm.task.event.TaskEventSupport.fireTaskCompleted(TaskEventSupport.java:46)
    at org.jbpm.task.service.TaskServiceSession.postTaskCompleteOperation(TaskServiceSession.java:502)
    at org.jbpm.task.service.TaskServiceSession.taskOperation(TaskServiceSession.java:468)
    at org.jbpm.task.service.local.LocalTaskService.complete(LocalTaskService.java:80)


I test task client of HornetQ, everything is ok. but how to use local service?
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