[jboss-user] [JBoss jBPM] - NullPointerException after signal token in Process State wit

[kirq4e]

Hi guys,

Recently me and my colleague started learning jBPM for our new project. I have started creating some processes to learn its capabilities.
We have developed a simple Parent-Children scenario.

The parent process is:
<?xml version="1.0" encoding="UTF-8"?>
  | <process-definition  xmlns=""  name="ParentProcess">
  | 	<start-state name="start">
  | 		<transition to="SetInputVariable" name="toSetInputVariable"></transition>
  | 	</start-state>
  | 
  | 	<process-state name="InvokeChildProcess">
  | 		<sub-process name="ChildProcess" binding="late"></sub-process>
  | 		<variable access="read" name="parentKey"></variable>
  | 		<variable access="read,write" name="lastVisitedProcess"></variable>
  | 		<transition to="PrintVariables" name="toPrintVariables"></transition>
  | 	</process-state>
  | 
  | 	<node name="SetInputVariable">
  | 		<action class="com.sirma.ecs2.test.subprocess.actions.SetInputVariables"></action>
  | 		<transition to="InvokeChildProcess" name="toInvokeChildProcess"></transition>
  | 	</node>
  | 
  | 	<node name="PrintVariables">
  | 		<action class="com.sirma.ecs2.test.subprocess.actions.PrintVariables"></action>
  | 		<transition to="end" name="toEnd"></transition>
  | 	</node>
  | 	<end-state name="end"></end-state>
  | </process-definition>

The child process is:
<?xml version="1.0" encoding="UTF-8"?>
  | <process-definition  xmlns=""  name="ChildProcess">
  | 	<start-state name="start">
  | 		<transition to="Reset Variables" name="toResetVariables"></transition>
  | 	</start-state>
  | 
  | 	<node name="Reset Variables">
  | 		<action name="Reset Variables" class="com.sirma.ecs2.test.subprocess.actions.ResetVariables"></action>
  | 		<transition to="WaitSignal" name="toWaitSignal"></transition>
  | 	</node>
  | 
  | 	<state name="WaitSignal">
  | 		<transition to="end" name="toEnd">
  | 			<action class="com.sirma.ecs2.test.subprocess.actions.ExitWait"></action>
  | 		</transition>
  | 	</state>
  | 	<end-state name="end"></end-state>
  | </process-definition>

I start a Parent process and signal it the Token stops at the child`s State node: WaitSignal. 
The Root token of the parent node is in InvokeChildProcess. The ActionHandlers are very simple just print a message and work with some variables.

If i try to signal the Parent process`s root node i got a NullPointerException:
Caused by: java.lang.NullPointerException
  | 	at org.jbpm.graph.node.ProcessState.leave(ProcessState.java:186)
  | 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  | 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  | 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  | 	at java.lang.reflect.Method.invoke(Method.java:585)
  | 	at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:173)
  | 	at org.jbpm.graph.def.Node_$$_javassist_49.leave(Node_$$_javassist_49.java)
  | 	at org.jbpm.graph.exe.Token.signal(Token.java:192)
  | 	at org.jbpm.graph.exe.Token.signal(Token.java:140)
  | 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  | 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  | 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  | 	at java.lang.reflect.Method.invoke(Method.java:585)
  | 	at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:173)
  | 	at org.jbpm.graph.exe.Token_$$_javassist_64.signal(Token_$$_javassist_64.java)
  | 	at com.kpenev.test.TestBean.signalToken(Unknown Source)
  | 

Probably the right token that i have to signal is the token of the subprocess, but i don`t think that such an exception should occur. 

The code that i execute is:
JbpmContext jbpmContext = JbpmConfiguration.getInstance()
  | 				.createJbpmContext();
  | 		try {
  | 			ProcessInstance instance = jbpmContext.getGraphSession()
  | 					.loadProcessInstance(instanceID);
  | 			instance.getRootToken().signal();
  | 		} finally {
  | 			jbpmContext.close();
  | 		}

The code that really works is:
JbpmContext jbpmContext = JbpmConfiguration.getInstance()
  | 				.createJbpmContext();
  | 		try {
  | 			ProcessInstance instance = jbpmContext.getGraphSession()
  | 					.loadProcessInstance(instanceID);
  | 			instance.getRootToken().getSubProcessInstance().getRootToken()
  | 					.signal();
  | 		} finally {
  | 			jbpmContext.close();
  | 		}

I`m using jbpm-3.3.0.GA version and jboss-4.2.3.GA.

I debuged it and the subProcessInstance variable at ExecutionContext isn`t set.

Hope there is a solution for this, because in the near future i have to develop a very complex processes including subprocesses.

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