Claus Straube [http://community.jboss.org/people/clauss] created the discussion "NPE while serviceTask call" To view the discussion, visit: http://community.jboss.org/message/534977#534977 -------------------------------------------------------------- Hi all, I'm always running in a NPE with BPMN 2.0 (jBPM 4.3) and Spring 2.5.3. This is my testcase:     @Test     public void testAsyncCalls(){         //deploy process         repositoryService.createDeployment().addResourceFromClasspath("async_service_call.bpmn.xml").deploy();                 //start instance         ProcessInstance instance = executionService.startProcessInstanceByKey("foobar");         Assert.assertNotNull(instance);                 //get instance id         String iid = instance.getId();                 //set instance id as variable         executionService.setVariable(iid, "instanceId", iid);                 //signal first execution         Execution e1 = instance.findActiveExecutionIn("r1");         Assert.assertNotNull(e1);         executionService.signalExecutionById(e1.getId());                 //get instance back         ProcessInstance instance2 = executionService.findProcessInstanceById(iid);         Assert.assertNotNull(instance2);                 //check if the var has been set         Assert.assertEquals("foo", executionService.getVariable(iid, "v1"));                 //signal second execution         Execution e2 = instance2.findActiveExecutionIn("r2");         Assert.assertNotNull(e2);         ProcessInstance instance3 = executionService.signalExecutionById(e2.getId());                 //check if the instance has been ended         Assert.assertTrue(instance3.isEnded());     } This is the process: <?xml version="1.0" encoding="UTF-8"?> <bpmn:definitions id="ServiceTaskJava"     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     xsi:schemaLocation="http://schema.omg.org/spec/BPMN/2.0 BPMN20.xsd"     xmlns:bpmn="http://schema.omg.org/spec/BPMN/2.0" typeLanguage="http://www.w3.org/2001/XMLSchema"     expressionLanguage="http://www.w3.org/1999/XPath" targetNamespace="http://sample.bpmn.camunda.com/"     xmlns:jbpm="http://jbpm.org/4.0/bpmn2">     <bpmn:itemDefinition id="i1">         <jbpm:arg>             <jbpm:object expr="#{instanceId}" />         </jbpm:arg>     </bpmn:itemDefinition>     <bpmn:itemDefinition id="i2">         <jbpm:var name="v1" />     </bpmn:itemDefinition>     <bpmn:message id="im" name="input message"         structureRef="i1"></bpmn:message>     <bpmn:message id="om" name="output message"         structureRef="i2">     </bpmn:message>     <bpmn:interface id="if1" name="mocks.Mock01">         <bpmn:operation id="o1" name="call">             <bpmn:inMessageRef>inputMessage</bpmn:inMessageRef>             <bpmn:outMessageRef>outputMessage</bpmn:outMessageRef>         </bpmn:operation>     </bpmn:interface>     <!-- process definition -->     <bpmn:process id="foobar" name="async_process">         <bpmn:startEvent id="s" />                 <bpmn:sequenceFlow id="f1" name="s_2_r1" sourceRef="s" targetRef="r1" />         <bpmn:receiveTask id="r1" name="r1" />                 <!-- start -->         <bpmn:sequenceFlow id="f2" name="r1_2_t1" sourceRef="r1" targetRef="t1" />         <bpmn:serviceTask id="st1" name="st1" implementation="Other" operationRef="o1"/>                 <bpmn:sequenceFlow id="f3" name="st1_2_r2" sourceRef="st1" targetRef="r2" />         <!-- end -->                 <!--         <bpmn:sequenceFlow id="fx" name="r1_2_r2" sourceRef="r1" targetRef="r2" />         -->                 <bpmn:receiveTask id="r2" name="r2" />                 <bpmn:sequenceFlow id="f4" name="r2_2_e1" sourceRef="r2" targetRef="e1" />         <bpmn:endEvent id="e1" name="e1" />                </bpmn:process> </bpmn:definitions> and this is the service I want to call: package mocks;   public class Mock01 {             public String call(String var){         System.out.println(var);         return "foo";     }   } If I comment out the lines between 'start' and 'end' in my process (and comment in the flow between r1 and r2) no NPE happens (of cource the test fails). But if I run the process as it is, I will get a npe. Can onyone give me a hint where the problem is? Thanks in advance - Claus -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/534977#534977] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]