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JBPM4.3 Variable History
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reply from <a href="http://community.jboss.org/people/egycator">Khaled Talaat</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/535798#535798">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi Huisheng</p><p>When I used your proposed solution  as following :</p><pre class="jive-pre"><code class="jive-code jive-java">ProcessInstance processInstance = executionService.startProcessInstanceByKey(<font color="red">"Normal"</font>);
EnvironmentImpl environment =  ((EnvironmentFactory)processEngine).openEnvironment();
((ExecutionImpl)processInstance).createVariable(<font color="red">"test"</font>, <font color="red">"valuetest"</font>,<font color="red">"string"</font>,<font color="navy"><b>true</b></font>);
Session session = environment.get(Session.class);
Transaction tx  = session.beginTransaction();
session.update(processInstance);
tx.commit();
environment.close();
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>it throws a NullPointerException </p><pre class="jive-pre"><code class="jive-code jive-java">15:27:28,703 SEV | [BaseJbpmTestCase] TEST THROWS EXCEPTION: <font color="navy"><b>null</b></font>
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)
 
</code></pre><p>but when I use it with "isHistoryEnabled" , the variable is persisted.</p></div>
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