Hi,

I have a process that runs some Java, makes a decision on the results and either ends or loops via a node-task.

The node-task is intended for the user to display a jsp page and they can confirm the error before retrying the original node.

Like this....

<process-definition name="tims-test">
 <start-state name="start">
 <transition name="tr1" to="Start Remote Farm Job"></transition>
 </start-state>
 <node name="Start Remote Farm Job">
 <event type="node-enter">
 <action class='workflow.jbpm.actions.SetPageHandler'>
 <page>remote.jsp</page>
 </action>
 <action class='workflow.jbpm.actions.FarmStartJobHandler'>
 <propertiesfile>farm.properties</propertiesfile>
 </action>
 </event>
 <transition name="tr1" to="Was Remote Job Successful"></transition>
 </node>
 <decision name="Was Remote Job Successful">
 <handler class="workflow.jbpm.delegators.RemoteResponseDecisionHandler" />
 <transition name="success" to="Processing Complete"></transition>
 <transition name="fail" to="Remote Job Failed"></transition>
 </decision>
 <node-task name="Remote Job Failed">
 <event type="node-enter">
 <action class='workflow.jbpm.actions.SetPageHandler'>
 <page>error.jsp</page>
 </action>
 </event>
 <transition name="Re-run Remote Job" to="Start Remote Farm Job"></transition>
 </node-task>
 <end-state name="Processing Complete"></end-state>
</process-definition>

Problem is that the transition to the node-task fails with an exception. If this is changed to a state element instead of node-task, the process works as expected.

10:49:20,086 ERROR GraphElement : action threw exception: null
java.lang.NullPointerException
 at org.jbpm.graph.def.Transition.fireSuperStateEnterEvents(Transition.java:103)
 at org.jbpm.graph.def.Transition.take(Transition.java:82)
 at org.jbpm.graph.def.Node.leave(Node.java:349)
 at org.jbpm.graph.exe.ExecutionContext.leaveNode(ExecutionContext.java:101)
 at org.jbpm.graph.node.Decision.execute(Decision.java:94)
 at org.jbpm.graph.def.Node.enter(Node.java:284)
 at org.jbpm.graph.def.Transition.take(Transition.java:92)
 at org.jbpm.graph.def.Node.leave(Node.java:349)
 at org.jbpm.graph.def.Node.leave(Node.java:313)
 at org.jbpm.graph.exe.ExecutionContext.leaveNode(ExecutionContext.java:85)
 at workflow.jbpm.actions.StartRemoteJobHandler.execute(StartRemoteJobHandler.java:79)
 at org.jbpm.graph.def.Action.execute(Action.java:79)
 at org.jbpm.graph.def.GraphElement.executeActions(GraphElement.java:186)
 at org.jbpm.graph.def.GraphElement.fireAndPropagateEvent(GraphElement.java:149)
 at org.jbpm.graph.def.GraphElement.fireEvent(GraphElement.java:133)
 at org.jbpm.graph.def.Node.enter(Node.java:274)
 at org.jbpm.graph.def.Transition.take(Transition.java:92)
 at org.jbpm.graph.def.Node.leave(Node.java:349)
 at org.jbpm.graph.node.StartState.leave(StartState.java:73)
 at org.jbpm.graph.exe.Token.signal(Token.java:127)
 at org.jbpm.graph.exe.Token.signal(Token.java:92)

Anyone have any ideas to what I have missed to casue a transition to a node-task to fail?

Thanks,
Tim