ELExpressionException

adconet — Mon, 28 Nov 2011 13:02:38 GMT

We have a simple process with a listener on a user task. In this listener we call an EL expression which calls a method on a spring bean. Everything seems to work but for some reason we see the following exception in the log files:Nov 28, 2011 1:37:27 PM org.activiti.engine.impl.bpmn.parser.BpmnPars

Re: ELExpressionException

trademak — Mon, 28 Nov 2011 21:21:36 GMT

Hi,

Can you post your BPMN 2.0 XML file?

Best regards,

Re: ELExpressionException

adconet — Tue, 29 Nov 2011 09:40:30 GMT

Here is the XML.

<?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:activiti="http://activiti.org/bpmn" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlnsmgdc="http://www.omg.org/spec/DD/20100524/DC" xmlnsmgdi="http://www.omg.org/spec/DD/20100524/DI" typeLanguage="http://www.w3.org/2001/XMLSchema" expressionLanguage="http://www.w3.org/1999/XPath" targetNamespace="http://www.activiti.org/test">
<process id="completeWorkUnit" name="completeWorkUnit">
    <documentation>Process to complete a given work unit.</documentation>
    <startEvent id="startEvent" name="Start"></startEvent>
    <endEvent id="normalEndEvent" name="NormalEnd"></endEvent>
    <userTask id="doWork" name="doWork" activiti:candidateGroups="agent">
      <extensionElements>
        <activiti:taskListener event="create" expression="${ambiProcessService.createAmbiTask(task.id, workUnit)}"></activiti:taskListener>
      </extensionElements>
    </userTask>
    <parallelGateway id="parallelgateway1" name="Parallel Gateway"></parallelGateway>
    <sequenceFlow id="flow1" name="" sourceRef="startEvent" targetRef="parallelgateway1"></sequenceFlow>
    <sequenceFlow id="flow2" name="" sourceRef="parallelgateway1" targetRef="doWork"></sequenceFlow>
    <receiveTask id="receiveWorkUnitCompleted" name="receiveWorkUnitCompleted"></receiveTask>
    <sequenceFlow id="flow3" name="" sourceRef="parallelgateway1" targetRef="receiveWorkUnitCompleted"></sequenceFlow>
    <sequenceFlow id="flow4" name="" sourceRef="receiveWorkUnitCompleted" targetRef="normalEndEvent"></sequenceFlow>
    <sequenceFlow id="flow5" name="" sourceRef="doWork" targetRef="normalEndEvent"></sequenceFlow>
</process>
<bpmndi:BPMNDiagram id="BPMNDiagram_completeWorkUnit">
    <bpmndi:BPMNPlane bpmnElement="completeWorkUnit" id="BPMNPlane_completeWorkUnit">
      <bpmndi:BPMNShape bpmnElement="startEvent" id="BPMNShape_startEvent">
        <omgdc:Bounds height="35" width="35" x="30" y="153"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="normalEndEvent" id="BPMNShape_normalEndEvent">
        <omgdc:Bounds height="35" width="35" x="384" y="153"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="doWork" id="BPMNShape_doWork">
        <omgdc:Bounds height="55" width="105" x="240" y="220"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="parallelgateway1" id="BPMNShape_parallelgateway1">
        <omgdc:Bounds height="40" width="40" x="160" y="150"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="receiveWorkUnitCompleted" id="BPMNShape_receiveWorkUnitCompleted">
        <omgdc:Bounds height="55" width="105" x="240" y="70"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="flow1" id="BPMNEdge_flow1">
        <omgdi:waypoint x="65" y="170"></omgdi:waypoint>
        <omgdi:waypoint x="160" y="170"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow2" id="BPMNEdge_flow2">
        <omgdi:waypoint x="180" y="190"></omgdi:waypoint>
        <omgdi:waypoint x="180" y="247"></omgdi:waypoint>
        <omgdi:waypoint x="240" y="247"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow3" id="BPMNEdge_flow3">
        <omgdi:waypoint x="180" y="150"></omgdi:waypoint>
        <omgdi:waypoint x="180" y="97"></omgdi:waypoint>
        <omgdi:waypoint x="240" y="97"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow4" id="BPMNEdge_flow4">
        <omgdi:waypoint x="345" y="97"></omgdi:waypoint>
        <omgdi:waypoint x="401" y="97"></omgdi:waypoint>
        <omgdi:waypoint x="401" y="153"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow5" id="BPMNEdge_flow5">
        <omgdi:waypoint x="345" y="247"></omgdi:waypoint>
        <omgdi:waypoint x="401" y="247"></omgdi:waypoint>
        <omgdi:waypoint x="401" y="188"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
    </bpmndi:BPMNPlane>
</bpmndi:BPMNDiagram>
</definitions>

Re: ELExpressionException

trademak — Tue, 29 Nov 2011 20:50:22 GMT

Hi,

Did you define the ambiProcessService in a Spring configuration file?
Where is workUnit referring to?

Best regards,

Re: ELExpressionException

adconet — Wed, 30 Nov 2011 09:46:45 GMT

Yes, AmbiProcessService is a spring bean.

WorkUnit is just a plain pojo which is given as an inputparam during the startup of the process (runtimeService.startProcessInstanceByKey).

The strange thing is that the ambiProcessService gets called correctly. So the listener defined in the process correctly calls the EL expression. We just noticed this strange ELException which gets logged and we can't figure out why. Everything seems to work correctly.

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