[jboss-user] [JBoss jBPM] - Expression Language not worked in JBPM-jpdl-3.2.2

[soumya_in]

I used a back-end bean like this.

  | public String strUser = "user";	
  |      	public String getStrUser() {
  | 		return strUser;
  | 	}
  | 	public void setStrUser(String strUser) {
  | 		this.strUser = strUser;
  | 	}
  | 
I used a Expression Language to this Processdefinition.xml as follows.

  | <process-definition  xmlns="urn:jbpm.org:jpdl-3.2"  name="loanProcess">
  | 	<start-state name="start-state1">
  | 		<task name="StartTask"></task>
  | 		<transition to="task-node1"></transition>
  | 	</start-state>
  | 		<event type="task-create">
  | 		<action class="com.sample.action.AssignUsr"></action>
  | 	</event>
  | 	<task-node name="task-node1">
  | 		<task name="task1">			<assignment expression="user(#{obj[strUser]})"></assignment>
  | 		</task>
  | 		<transition to="End"></transition>
  | 	</task-node>
  | 	<end-state name="End"></end-state>
  | 
I set the back-end bean object to contextInstance in the following way in the JUnit 

  | processInstance.getContextInstance().setVariable("obj", obj);
  | 
Got a stack trace like this

  | 14:28:27,401 [main] DEBUG ExpressionAssignmentHandler : resolving first term 'user(#{obj[strUser]})'
  | Exception in thread "main" org.jbpm.graph.def.DelegationException: couldn't resolve assignment expression 'user(#{obj[strUser]})'
  | 	at org.jbpm.taskmgmt.exe.TaskMgmtInstance.performAssignment(TaskMgmtInstance.java:216)
  | 	at org.jbpm.taskmgmt.exe.TaskInstance.assign(TaskInstance.java:204)
  | 	at org.jbpm.taskmgmt.exe.TaskMgmtInstance.createTaskInstance(TaskMgmtInstance.java:154)
  | 	at org.jbpm.graph.node.TaskNode.execute(TaskNode.java:168)
  | 	at org.jbpm.graph.def.Node.enter(Node.java:319)
  | 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  | 	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  | 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  | 	at java.lang.reflect.Method.invoke(Unknown Source)
  | 	at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:157)
  | 	at org.jbpm.graph.def.Node$$EnhancerByCGLIB$$89d40aac.enter(<generated>)
  | 	at org.jbpm.graph.def.Transition.take(Transition.java:151)
  | 	at org.jbpm.graph.def.Node.leave(Node.java:394)
  | 	at org.jbpm.graph.node.StartState.leave(StartState.java:70)
  | 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  | 	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  | 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  | 	at java.lang.reflect.Method.invoke(Unknown Source)
  | 	at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:157)
  | 	at org.jbpm.graph.def.Node$$EnhancerByCGLIB$$89d40aac.leave(<generated>)
  | 	at org.jbpm.graph.exe.Token.signal(Token.java:195)
  | 	at org.jbpm.graph.exe.Token.signal(Token.java:140)
  | 	at org.jbpm.graph.exe.ProcessInstance.signal(ProcessInstance.java:271)
  | 	at com.cts.client.TestClient.main(TestClient.java:30)
  | Caused by: org.jbpm.identity.assignment.ExpressionAssignmentException: couldn't resolve assignment expression 'user(#{obj[strUser]})'
  | 	at org.jbpm.identity.assignment.ExpressionAssignmentHandler.assign(ExpressionAssignmentHandler.java:97)
  | 	at org.jbpm.taskmgmt.exe.TaskMgmtInstance.performAssignmentDelegation(TaskMgmtInstance.java:228)
  | 	at org.jbpm.taskmgmt.exe.TaskMgmtInstance.performAssignment(TaskMgmtInstance.java:201)
  | 	... 23 more
  | Caused by: org.jbpm.identity.assignment.ExpressionAssignmentException: user '#{obj[strUser]}' couldn't be fetched from the user db
  | 	at org.jbpm.identity.assignment.ExpressionAssignmentHandler.getUserByName(ExpressionAssignmentHandler.java:209)
  | 	at org.jbpm.identity.assignment.ExpressionAssignmentHandler.resolveFirstTerm(ExpressionAssignmentHandler.java:147)
  | 	at org.jbpm.identity.assignment.ExpressionAssignmentHandler.assign(ExpressionAssignmentHandler.java:75)
  | 	... 25 more
  | 
Am i doing something wrong!!!!
Is there any way to do the following i.e. to access certain variable from a back-end bean using Expression...

 NB:- My jpbm is not integrated with Seam and I used to assign the task to that user whichever I wish to set in my back-end bean
Thanks
Soumya


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