[jboss-user] [jBPM] - XOR Gateway

tmmaluleke do-not-reply at jboss.com
Fri Oct 12 04:19:53 EDT 2012


tmmaluleke [https://community.jboss.org/people/tmmaluleke] created the discussion

"XOR Gateway"

To view the discussion, visit: https://community.jboss.org/message/764516#764516

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Hello,

I have a project which have the XOR gateway en when I run it its gives me this error:

This is what I coded in my XOR gateway:

if(studentId !="null"); the process must continue or if(studentId =="null"); the process must alert the user to input the studentId. but when I run this error occurs.


Exception in thread "Thread-4" org.jbpm.workflow.instance.WorkflowRuntimeException: [validatingStudentId.bpmn:1 - Gateway:5] -- Exception when trying to evaluate constraint Accept in split Gateway
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:130)
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:205)
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:164)
    at org.jbpm.workflow.instance.impl.ExtendedNodeInstanceImpl.triggerCompleted(ExtendedNodeInstanceImpl.java:47)
    at org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:162)
    at org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:143)
    at org.jbpm.workflow.instance.node.WorkItemNodeInstance.triggerCompleted(WorkItemNodeInstance.java:239)
    at org.jbpm.workflow.instance.node.HumanTaskNodeInstance.triggerCompleted(HumanTaskNodeInstance.java:90)
    at org.jbpm.workflow.instance.node.WorkItemNodeInstance.workItemCompleted(WorkItemNodeInstance.java:301)
    at org.jbpm.workflow.instance.node.WorkItemNodeInstance.signalEvent(WorkItemNodeInstance.java:277)
    at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:326)
    at org.drools.process.instance.impl.DefaultWorkItemManager.completeWorkItem(DefaultWorkItemManager.java:116)
    at org.jbpm.process.workitem.wsht.GenericHTWorkItemHandler$TaskCompletedHandler.handleCompletedTask(GenericHTWorkItemHandler.java:221)
    at org.jbpm.process.workitem.wsht.GenericHTWorkItemHandler$TaskCompletedHandler$1.run(GenericHTWorkItemHandler.java:187)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.RuntimeException: Exception when trying to evaluate constraint Accept in split Gateway
    at org.jbpm.workflow.instance.node.SplitInstance.internalTrigger(SplitInstance.java:79)
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:124)
    ... 14 more
Caused by: java.lang.RuntimeException: unable to execute ReturnValueEvaluator
    at org.jbpm.process.instance.impl.ReturnValueConstraintEvaluator.evaluate(ReturnValueConstraintEvaluator.java:130)
    at org.jbpm.workflow.instance.node.SplitInstance.internalTrigger(SplitInstance.java:72)
    ... 15 more
Caused by: java.lang.RuntimeException: Constraints must return boolean values: if(studentId !=" null"); returns null
    at org.jbpm.process.instance.impl.MVELReturnValueEvaluator.evaluate(MVELReturnValueEvaluator.java:119)
    at org.jbpm.process.instance.impl.ReturnValueConstraintEvaluator.evaluate(ReturnValueConstraintEvaluator.java:128)
    ... 16 more
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