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How to read element variable from multi-instance sub-process?

bobloveactiviti

Hallo:
How to read element variable from multi-instance sub-process? For example, I add a collection of 3 elements to the sub-process and start the process. I wish to get corresponding the element variable for each of the 3 sub-process instances in order to get a mapping between element and sub-process instance.
I could read element variable from tasks(usertask, servicetask).
Thanks in advance!

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Comments

martin_grofcik

Hi,

Variable should be accessible in the subprocess. (elementVariable :http://www.activiti.org/userguide/#bpmnMultiInstance)
If not please create jUnit test for it.
Regards
Martin

bobloveactiviti

Hi Martin,
Thanks for the reply!
The bpmn file is attached and the unit test is as below. I assign a collection of 3 variable to the multi-instance sub-process and assert the 3 sub-process instances are running correctly. Then I wish to get element variable with predefined variable name for each of the sub-process instance using activitiRule.getRuntimeService().getVariable(), but it returns null.
I could get instance variable for multi-instance usertask/task using this way.

<br>@Deployment(resources = {&nbsp; ExecuteMultiinstanceSubprocess.bpmn" })<br>&nbsp;&nbsp;&nbsp; public void test_ExecuteMultiSubprocess_should_acess_instance_elementvariable()<br>&nbsp;&nbsp;&nbsp; {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Map<String, Object> variables = new HashMap<String, Object>();<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; List<String> collectionVariables = new ArrayList<String>();<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; collectionVariables.add("elementVariable1");<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; collectionVariables.add("elementVariable2");<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; collectionVariables.add("elementVariable3");<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; variables.put("collectionVariables", collectionVariables);<br><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ProcessInstance process = activitiRule.getRuntimeService().startProcessInstanceByKey("processAcsessSubprocessMultiinstanceVariable", variables);<br><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; List<Execution> subProccesInstances = activitiRule<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; .getRuntimeService()<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; .createExecutionQuery()<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; .activityId("subprocessMultiinstance")<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; .processInstanceId(process.getProcessInstanceId())<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; .list();<br><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Assertions.assertThat(subProccesInstances.size()).as("number of parallel sub-processes instances").isEqualTo(3);<br><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; String elementVariable1 = (String) activitiRule.getRuntimeService().getVariable(subProccesInstances.get(0).getId(), "elementVariable");<br><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Assertions.assertThat(elementVariable1).as("elementVariable should be elementVariable1 but get null").isEqualTo("elementVariable1");<br>&nbsp;&nbsp;&nbsp; }<br>

ExecuteMultiinstanceSubprocess.bpmn__0.txt.zip

martin_grofcik

Hi,
You are right. 🙂
I checked that variables are in the DB, but they are not returned from the query. (jUnit test https://github.com/martin-grofcik/activiti-unit-test-template/tree/forum-element-variable)
Could you create issue for that?
Regards
Martin