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Referring to task local variable in expression (activiti 5.16.3)

raka

Hi,

I have a conditional transition from userTask1 to userTask2. My tasks definition:

<userTask id="userTask1" name="User Task 1" activiti

wner="kermit">
      <extensionElements>
        <activiti:formProperty id="varA" name="varA" type="string"/>
      </extensionElements>
    </userTask>
    <userTask id="userTask2" name="User Task 2" activiti

wner="piggy">
      <extensionElements>
        <activiti:formProperty id="varB" name="varB" type="string"/>
      </extensionElements>
    </userTask>

I used the following expression in the bpmn file: <conditionExpression xsi:type="tFormalExpression"><![CDATA[${userTask1.varA == "uTask2"}]]></conditionExpression>

When I mark the userTask1 as "completed", I use the following method in the Java API:

—
Map<String, Object> variableMap = new HashMap<String, Object>();
variableMap.put("varA", "1");
activitiRule.getTaskService().complete(tasks.get(0).getId(), variableMap, true);
—

Notice the "true" param at the end, this is to say that those variables are local to the task.

In a separate test I could verify that the the variable is indeed stored locally to the task.

But, in this test (with the conditional transition), I'm getting this error:

—-
org.activiti.engine.ActivitiException: Unknown property used in expression: ${userTask1.varA == "uTask2"}
   at org.activiti.engine.impl.el.JuelExpression.getValue(JuelExpression.java:53)
        ….
Caused by: org.activiti.engine.impl.javax.el.PropertyNotFoundException: Cannot resolve identifier 'userTask1'
—-

How to solve this?

Thanks,
Raka

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Comments

raka

Sorry, looks like my XML snippet was automatically removed. It was for my task definition. I have 2 user tasks whose id is: userTask1 and userTask2

raka

Better formatted: http://stackoverflow.com/questions/26264543/referring-to-task-local-variable-in-expression-activiti-5-16-3

martin_grofcik

Hi,

I would add only one note to the answer in stackoverflow.
Have a look on the following jUnit tests in activiti source:

<br>&nbsp; public void testCompleteWithTaskLocalParameters() {<br>&nbsp;&nbsp; ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("testTaskLocalVars");<br><br>&nbsp;&nbsp;&nbsp; // Fetch first task<br>&nbsp;&nbsp;&nbsp; Task task = taskService.createTaskQuery().singleResult();<br><br>&nbsp;&nbsp;&nbsp; // Complete first task<br>&nbsp;&nbsp;&nbsp; Map<String, Object> taskParams = new HashMap<String, Object>();<br>&nbsp;&nbsp;&nbsp; taskParams.put("a", 1);<br>&nbsp;&nbsp;&nbsp; taskParams.put("b", 1);<br>&nbsp;&nbsp;&nbsp; taskService.complete(task.getId(), taskParams, true);<br>&nbsp;&nbsp;&nbsp; <br>&nbsp;&nbsp;&nbsp; // Verify vars are not stored process instance wide<br>&nbsp;&nbsp;&nbsp; assertNull(runtimeService.getVariable(processInstance.getId(), "a"));<br>&nbsp;&nbsp;&nbsp; assertNull(runtimeService.getVariable(processInstance.getId(), "b"));<br>&nbsp;&nbsp;&nbsp; <br>&nbsp;&nbsp;&nbsp; // verify script listener has done its job<br>&nbsp;&nbsp;&nbsp; assertEquals(new Integer(2), runtimeService.getVariable(processInstance.getId(), "sum"));<br><br>&nbsp;&nbsp;&nbsp; // Fetch second task<br>&nbsp;&nbsp;&nbsp; taskService.createTaskQuery().singleResult();<br><br>&nbsp; }<br>

<br>&nbsp; @Deployment(resources = { <br>&nbsp;&nbsp;&nbsp; "org/activiti/engine/test/api/twoTasksProcess.bpmn20.xml" })<br>&nbsp; public void testCompleteWithParametersTask() {<br>&nbsp;&nbsp;&nbsp; ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("twoTasksProcess");<br><br>&nbsp;&nbsp;&nbsp; // Fetch first task<br>&nbsp;&nbsp;&nbsp; Task task = taskService.createTaskQuery().singleResult();<br>&nbsp;&nbsp;&nbsp; assertEquals("First task", task.getName());<br><br>&nbsp;&nbsp;&nbsp; // Complete first task<br>&nbsp;&nbsp;&nbsp; Map<String, Object> taskParams = new HashMap<String, Object>();<br>&nbsp;&nbsp;&nbsp; taskParams.put("myParam", "myValue");<br>&nbsp;&nbsp;&nbsp; taskService.complete(task.getId(), taskParams);<br><br>&nbsp;&nbsp;&nbsp; // Fetch second task<br>&nbsp;&nbsp;&nbsp; task = taskService.createTaskQuery().singleResult();<br>&nbsp;&nbsp;&nbsp; assertEquals("Second task", task.getName());<br><br>&nbsp;&nbsp;&nbsp; // Verify task parameters set on execution<br>&nbsp;&nbsp;&nbsp; Map<String, Object> variables = runtimeService.getVariables(processInstance.getId());<br>&nbsp;&nbsp;&nbsp; assertEquals(1, variables.size());<br>&nbsp;&nbsp;&nbsp; assertEquals("myValue", variables.get("myParam"));<br>&nbsp; }<br>

Regards
Martin