ActivityExectuion take issue

[chrishe]

Hi there:
   In the API doc, the take method in ActivityExcution has described as this:leaves the current activity by taking the given transition.
   I wrote a unit test as following, try to leave the current activity to the next manually:

public class TransitionTest {

   private static RuntimeService runtimeService;
   private static RepositoryService repositoryService;
   private static Deployment deployment;
   
   
   @BeforeClass
   public static void init() {
      ProcessEngine processEngine = ProcessEngineConfiguration
            .createStandaloneProcessEngineConfiguration()
             .buildProcessEngine(); 
      
      repositoryService = processEngine.getRepositoryService();
      deployment = repositoryService.createDeployment()
         .addClasspathResource("zfsoft/Transition.bpmn20.xml")
         .deploy();
      
      runtimeService = processEngine.getRuntimeService();
   }
   
   @Test
   public void transitionTest(){
      ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("Transition");   
      String processDefinitionId = processInstance.getProcessDefinitionId();      
      
      ExecutionEntity executionEntity = (ExecutionEntity) runtimeService.createExecutionQuery()
            .executionId(processInstance.getProcessInstanceId()).singleResult();
      
      ProcessDefinitionEntity processDef = (ProcessDefinitionEntity) ((RepositoryServiceImpl) repositoryService)
            .getDeployedProcessDefinition(processDefinitionId);
      
      ActivityImpl currentActiviti = processDef.findActivity("ApplicationTask");
            
      String activitiId = currentActiviti.getId();
      System.out.println("current activitiId:" + activitiId);

      TransitionImpl outgoingTran = currentActiviti.findOutgoingTransition("flow2");
      System.out.println(outgoingTran);

      try {
         executionEntity.take(outgoingTran);
      } catch (Exception e1) {
         e1.printStackTrace();
      }
   }
   
   @AfterClass
   public static void destory(){
      repositoryService.deleteDeployment(deployment.getId(), true);
   }
}
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And the BPMN as following:

<?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" 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="Transition" name="Transition">
    <documentation>Place documentation for the 'Transition' process here.</documentation>
    <startEvent id="startevent1" name="Start"></startEvent>
    <userTask id="ApplicationTask" name="Application Task" activiti:assignee="kermit"></userTask>
    <userTask id="ApproveTask" name="Approve Task" activiti:assignee="kermit"></userTask>
    <endEvent id="endevent1" name="End"></endEvent>
    <sequenceFlow id="flow1" name="" sourceRef="startevent1" targetRef="ApplicationTask"></sequenceFlow>
    <sequenceFlow id="flow2" name="" sourceRef="ApplicationTask" targetRef="ApproveTask"></sequenceFlow>
    <sequenceFlow id="flow3" name="" sourceRef="ApproveTask" targetRef="endevent1"></sequenceFlow>
  </process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_Transition">
    <bpmndi:BPMNPlane bpmnElement="Transition" id="BPMNPlane_Transition">
      <bpmndi:BPMNShape bpmnElement="startevent1" id="BPMNShape_startevent1">
        <omgdc:Bounds height="35" width="35" x="147" y="215"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="ApplicationTask" id="BPMNShape_ApplicationTask">
        <omgdc:Bounds height="55" width="105" x="267" y="209"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="ApproveTask" id="BPMNShape_ApproveTask">
        <omgdc:Bounds height="55" width="105" x="460" y="205"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="endevent1" id="BPMNShape_endevent1">
        <omgdc:Bounds height="35" width="35" x="700" y="215"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="flow1" id="BPMNEdge_flow1">
        <omgdi:waypoint x="182" y="232"></omgdi:waypoint>
        <omgdi:waypoint x="267" y="236"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow2" id="BPMNEdge_flow2">
        <omgdi:waypoint x="372" y="236"></omgdi:waypoint>
        <omgdi:waypoint x="460" y="232"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow3" id="BPMNEdge_flow3">
        <omgdi:waypoint x="565" y="232"></omgdi:waypoint>
        <omgdi:waypoint x="671" y="232"></omgdi:waypoint>
        <omgdi:waypoint x="700" y="232"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</definitions>
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When run the test, we got the error message:
java.lang.NullPointerException at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:481)

Ok, it seems the  Context.getCommandContext() has a null result.

I have read the source code, but got no idea.

So the question is why the 'take' does not work? And what is Context used for?

Could someone give a hand?

[jbarrez]

You always have to communicate with the Activiti engine through it's services (repositoryService, taskservice, etc.).

Calling directly on objects like you do, is not possible: Activiti needs to build up a command conext (transactions, logging, etc.) around the operation you want to do.

[chrishe]

Thanks jbarrez, I'm one of your big fans by the way
I may not totally catch your word, so if you get time, could you make a small adjustment of my code?
Or point of the wrong line code and give me the right one.
Thanks so much!

[ronald_van_kuij]

you know, the 'runtimeservice', 'repositoryservice', 'taskservice' etc… as you can see in the 10min tutorial in the docs…

Oh and btw, questions like these are better asked in the user forum.