Expression in Conditions throws PropertyNotFoundException Excetion

[diren]

I am new to Activiti, so my appologies if this is just a simple beginners pebcak (problem exists between chair and keyboard). I played arround and searched the web without getting close to a solution, so I try this forum.

When doing a condition like ${doneLooping==true && check=="ok"}  I always get a 

org.activiti.engine.impl.javax.el.PropertyNotFoundException: Cannot resolve identifier 'doneLooping'‍

and the pretty stack trace that comes along with it. Even explicitly initialising the variables in a script task through

execution.setVariable("doneLooping", false)‍

did not change anything. The sample bpmn2 is below, any hints would be most appreciated!

Thanks, Diren.

<?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:xsd="http://www.w3.org/2001/XMLSchema" xmlns:activiti="http://activiti.org/bpmn" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:omgdc="http://www.omg.org/spec/DD/20100524/DC" xmlns:omgdi="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="myTest" name="My Test" isExecutable="true">
    <startEvent id="startevent1" name="Start"></startEvent>
    <endEvent id="endevent1" name="End"></endEvent>
    <userTask id="usertask1" name="First Task" activiti:assignee="kermit">
      <extensionElements>
        <activiti:formProperty id="userName" name="User Name" type="string" variable="assignee" default="kermit"></activiti:formProperty>
      </extensionElements>
    </userTask>
    <sequenceFlow id="flow1" sourceRef="exclusivegateway3" targetRef="usertask1"></sequenceFlow>
    <exclusiveGateway id="exclusivegateway1" name="Exclusive Gateway" default="flow4"></exclusiveGateway>
    <parallelGateway id="parallelgateway3" name="Parallel Gateway"></parallelGateway>
    <userTask id="usertask2" name="Loop Task" activiti:assignee="kermit">
      <extensionElements>
        <activiti:formProperty id="doneLooping" name="Done Looping?" type="boolean" variable="doneLooping" default="false"></activiti:formProperty>
        <activiti:formProperty id="loops" type="long" variable="loops" writable="false"></activiti:formProperty>
      </extensionElements>
    </userTask>
    <sequenceFlow id="flow2" sourceRef="exclusivegateway4" targetRef="usertask2"></sequenceFlow>
    <sequenceFlow id="flow3" sourceRef="usertask2" targetRef="exclusivegateway5"></sequenceFlow>
    <sequenceFlow id="flow4" sourceRef="exclusivegateway1" targetRef="exclusivegateway4"></sequenceFlow>
    <sequenceFlow id="flow5" sourceRef="exclusivegateway5" targetRef="parallelgateway3">
      <conditionExpression xsi:type="tFormalExpression"><![CDATA[${doneLooping==true}]]></conditionExpression>
    </sequenceFlow>
    <sequenceFlow id="loopAgain" sourceRef="exclusivegateway5" targetRef="scripttask2"></sequenceFlow>
    <userTask id="usertask3" name="Check Task" activiti:assignee="kermit">
      <extensionElements>
        <activiti:formProperty id="doneLooping" name="Done Looping" type="boolean" variable="doneLooping"></activiti:formProperty>
        <activiti:formProperty id="check" name="Check" type="enum" variable="check" required="true">
          <activiti:value id="ok" name="OK"></activiti:value>
          <activiti:value id="nok" name="NOK"></activiti:value>
        </activiti:formProperty>
      </extensionElements>
    </userTask>
    <exclusiveGateway id="exclusivegateway2" name="Exclusive Gateway"></exclusiveGateway>
    <sequenceFlow id="bypass" sourceRef="exclusivegateway1" targetRef="parallelgateway3">
      <conditionExpression xsi:type="tFormalExpression"><![CDATA[${doneLooping==true && check=="ok"}]]></conditionExpression>
    </sequenceFlow>
    <sequenceFlow id="flow8" sourceRef="usertask1" targetRef="exclusivegateway1"></sequenceFlow>
    <exclusiveGateway id="exclusivegateway3" name="Exclusive Gateway"></exclusiveGateway>
    <sequenceFlow id="flow9" sourceRef="scripttask1" targetRef="exclusivegateway3"></sequenceFlow>
    <sequenceFlow id="flow10" sourceRef="parallelgateway3" targetRef="usertask3"></sequenceFlow>
    <sequenceFlow id="flow11" sourceRef="usertask3" targetRef="exclusivegateway2"></sequenceFlow>
    <sequenceFlow id="flow12" sourceRef="exclusivegateway2" targetRef="exclusivegateway3"></sequenceFlow>
    <scriptTask id="scripttask1" name="Script Task" activiti:autoStoreVariables="false">
      <script>execution.setVariable("loops", 0)
execution.setVariable("doneLooping", false)</script>
    </scriptTask>
    <sequenceFlow id="flow13" sourceRef="startevent1" targetRef="scripttask1"></sequenceFlow>
    <scriptTask id="scripttask2" name="Loops++" activiti:autoStoreVariables="false">
      <script>execution.setVariable("loops", loops+1)</script>
    </scriptTask>
    <sequenceFlow id="flow14" sourceRef="scripttask2" targetRef="exclusivegateway4"></sequenceFlow>
    <sequenceFlow id="flow15" sourceRef="exclusivegateway2" targetRef="endevent1"></sequenceFlow>
    <exclusiveGateway id="exclusivegateway4" name="Parallel Gateway"></exclusiveGateway>
    <exclusiveGateway id="exclusivegateway5" name="Parallel Gateway" default="loopAgain"></exclusiveGateway>
  </process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_myTest">
    <bpmndi:BPMNPlane bpmnElement="myTest" id="BPMNPlane_myTest">
      <bpmndi:BPMNShape bpmnElement="startevent1" id="BPMNShape_startevent1">
        <omgdc:Bounds height="35.0" width="35.0" x="300.0" y="291.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="endevent1" id="BPMNShape_endevent1">
        <omgdc:Bounds height="35.0" width="35.0" x="1406.0" y="290.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="usertask1" id="BPMNShape_usertask1">
        <omgdc:Bounds height="55.0" width="105.0" x="616.0" y="280.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="exclusivegateway1" id="BPMNShape_exclusivegateway1">
        <omgdc:Bounds height="40.0" width="40.0" x="766.0" y="287.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="parallelgateway3" id="BPMNShape_parallelgateway3">
        <omgdc:Bounds height="40.0" width="40.0" x="1136.0" y="287.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="usertask2" id="BPMNShape_usertask2">
        <omgdc:Bounds height="55.0" width="105.0" x="916.0" y="280.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="usertask3" id="BPMNShape_usertask3">
        <omgdc:Bounds height="55.0" width="105.0" x="1206.0" y="280.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="exclusivegateway2" id="BPMNShape_exclusivegateway2">
        <omgdc:Bounds height="40.0" width="40.0" x="1346.0" y="287.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="exclusivegateway3" id="BPMNShape_exclusivegateway3">
        <omgdc:Bounds height="40.0" width="40.0" x="546.0" y="288.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="scripttask1" id="BPMNShape_scripttask1">
        <omgdc:Bounds height="55.0" width="105.0" x="380.0" y="281.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="scripttask2" id="BPMNShape_scripttask2">
        <omgdc:Bounds height="55.0" width="105.0" x="916.0" y="150.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="exclusivegateway4" id="BPMNShape_exclusivegateway4">
        <omgdc:Bounds height="40.0" width="40.0" x="856.0" y="287.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="exclusivegateway5" id="BPMNShape_exclusivegateway5">
        <omgdc:Bounds height="40.0" width="40.0" x="1056.0" y="287.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="flow1" id="BPMNEdge_flow1">
        <omgdi:waypoint x="586.0" y="308.0"></omgdi:waypoint>
        <omgdi:waypoint x="616.0" y="307.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow2" id="BPMNEdge_flow2">
        <omgdi:waypoint x="896.0" y="307.0"></omgdi:waypoint>
        <omgdi:waypoint x="916.0" y="307.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow3" id="BPMNEdge_flow3">
        <omgdi:waypoint x="1021.0" y="307.0"></omgdi:waypoint>
        <omgdi:waypoint x="1056.0" y="307.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow4" id="BPMNEdge_flow4">
        <omgdi:waypoint x="806.0" y="307.0"></omgdi:waypoint>
        <omgdi:waypoint x="856.0" y="307.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow5" id="BPMNEdge_flow5">
        <omgdi:waypoint x="1096.0" y="307.0"></omgdi:waypoint>
        <omgdi:waypoint x="1136.0" y="307.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="loopAgain" id="BPMNEdge_loopAgain">
        <omgdi:waypoint x="1076.0" y="287.0"></omgdi:waypoint>
        <omgdi:waypoint x="1075.0" y="224.0"></omgdi:waypoint>
        <omgdi:waypoint x="1077.0" y="177.0"></omgdi:waypoint>
        <omgdi:waypoint x="1021.0" y="177.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="bypass" id="BPMNEdge_bypass">
        <omgdi:waypoint x="786.0" y="327.0"></omgdi:waypoint>
        <omgdi:waypoint x="785.0" y="369.0"></omgdi:waypoint>
        <omgdi:waypoint x="1156.0" y="369.0"></omgdi:waypoint>
        <omgdi:waypoint x="1156.0" y="327.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow8" id="BPMNEdge_flow8">
        <omgdi:waypoint x="721.0" y="307.0"></omgdi:waypoint>
        <omgdi:waypoint x="766.0" y="307.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow9" id="BPMNEdge_flow9">
        <omgdi:waypoint x="485.0" y="308.0"></omgdi:waypoint>
        <omgdi:waypoint x="546.0" y="308.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow10" id="BPMNEdge_flow10">
        <omgdi:waypoint x="1176.0" y="307.0"></omgdi:waypoint>
        <omgdi:waypoint x="1206.0" y="307.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow11" id="BPMNEdge_flow11">
        <omgdi:waypoint x="1311.0" y="307.0"></omgdi:waypoint>
        <omgdi:waypoint x="1346.0" y="307.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow12" id="BPMNEdge_flow12">
        <omgdi:waypoint x="1366.0" y="327.0"></omgdi:waypoint>
        <omgdi:waypoint x="1366.0" y="424.0"></omgdi:waypoint>
        <omgdi:waypoint x="993.0" y="424.0"></omgdi:waypoint>
        <omgdi:waypoint x="566.0" y="424.0"></omgdi:waypoint>
        <omgdi:waypoint x="566.0" y="328.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow13" id="BPMNEdge_flow13">
        <omgdi:waypoint x="335.0" y="308.0"></omgdi:waypoint>
        <omgdi:waypoint x="380.0" y="308.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow14" id="BPMNEdge_flow14">
        <omgdi:waypoint x="916.0" y="177.0"></omgdi:waypoint>
        <omgdi:waypoint x="876.0" y="178.0"></omgdi:waypoint>
        <omgdi:waypoint x="876.0" y="287.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow15" id="BPMNEdge_flow15">
        <omgdi:waypoint x="1386.0" y="307.0"></omgdi:waypoint>
        <omgdi:waypoint x="1406.0" y="307.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</definitions>
</xml>
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[diren]

Actually, after some more digging I found the issue to be due to a bug in Activiti Designer. As you can see here:
<code>
<scriptTask id="scripttask1" name="Script Task" activiti:autoStoreVariables="false">
      <script>execution.setVariable("loops", 0)
execution.setVariable("doneLooping", false)</script>
    </scriptTask>
</code>
when creating a scripttask in Activiti Designer there is no attribute <code>scriptFormat="javascript"</code> being created, though by default the properties pane's main config shows the format to be set to "javascript". This leads to the process engine not being able to execute anything in the script task. As workarround it is sufficient to switch to "groovy" and back to "javascript", then the attribute is properly set in the bpmn2 xml.
I will see if this issue has been reported in the activiti jira yet, otherwise I'll create a new entry.

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