[jbpm-issues] [JBoss JIRA] Assigned: (JBPM-2840) NullPointerException when ExecutionImpl.createVariable() with isHistoryEnabled=true

NullPointerException when ExecutionImpl.createVariable() with isHistoryEnabled=true ----------------------------------------------------------------------------------- Key: JBPM-2840 URL: https://jira.jboss.org/browse/JBPM-2840 Project: jBPM Issue Type: Bug Security Level: Public(Everyone can see) Affects Versions: jBPM 4.3 Reporter: Huisheng Xu Assignee: Maciej Swiderski Fix For: jBPM 4.4 When I want to create a history enabled variable, the ProcessInstanceImpl will invoke variable.seValue(), in this method, variable will fire a VariableUpdate command. This command will try to get the HistoryVariableImpl and update it. But at this moment, the HistoryVariableImpl has not been created, so there will be a NullPointerException. I think we should check whether the HistoryVariableImpl instance exists, then decide to update it or not. The used code is like this: ProcessInstance processInstance = executionService.startProcessInstanceByKey("Normal"); EnvironmentImpl environment = ((EnvironmentFactory)processEngine).openEnvironment(); ((ExecutionImpl)processInstance).createVariable("test", "valuetest","string",true); Session session = environment.get(Session.class); Transaction tx = session.beginTransaction(); session.update(processInstance); tx.commit(); environment.close(); The exception stack trace is like this: 15:27:28,703 SEV | [BaseJbpmTestCase] TEST THROWS EXCEPTION: null java.lang.NullPointerException at org.jbpm.pvm.internal.history.events.VariableUpdate.process(VariableUpdate.java:48) at org.jbpm.pvm.internal.history.HistorySessionImpl.process(HistorySessionImpl.java:31) at org.jbpm.pvm.internal.history.HistoryEvent.fire(HistoryEvent.java:62) at org.jbpm.pvm.internal.history.HistoryEvent.fire(HistoryEvent.java:52) at org.jbpm.pvm.internal.type.Variable.setValue(Variable.java:97) at org.jbpm.pvm.internal.model.ScopeInstanceImpl.createVariableObject(ScopeInstanceImpl.java:140) at org.jbpm.pvm.internal.model.ScopeInstanceImpl.createVariable(ScopeInstanceImpl.java:90) at com.asset.jupiter.jbpm.processes.Normal.NormalTest.testCreateProcessInstance(NormalTest.java:33) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at junit.framework.TestCase.runTest(TestCase.java:164) at org.jbpm.test.BaseJbpmTestCase.runTest(BaseJbpmTestCase.java:80) at junit.framework.TestCase.runBare(TestCase.java:130) at junit.framework.TestResult$1.protect(TestResult.java:106) at junit.framework.TestResult.runProtected(TestResult.java:124) at junit.framework.TestResult.run(TestResult.java:109) at junit.framework.TestCase.run(TestCase.java:120) at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)