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How to persist a timer
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created by <a href="http://community.jboss.org/people/krausest">Stefan Krause</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/629101#629101">View the full discussion</a>
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<div class="jive-rendered-content"><p>I'm failing miserably at persisting a process with a timer.</p><p>I'm disposing the session before the timer expires. When I call JPAKnowledgeService.loadStatefulKnowledgeSession with the old session id I'm getting an exception. I've attached a test case with a simple maven project. Just use mvn test to see the issue.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Any help would be appreciated.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code">
java.lang.IllegalStateException: java.lang.reflect.InvocationTargetException
          at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommanService(KnowledgeStoreServiceImpl.java:101)
          at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.loadStatefulKnowledgeSession(KnowledgeStoreServiceImpl.java:69)
          at org.drools.persistence.jpa.JPAKnowledgeService.loadStatefulKnowledgeSession(JPAKnowledgeService.java:131)
          at net.stefankrause.jbpm.ProcessRunner.setupSession(ProcessRunner.java:94)
          at net.stefankrause.jbpm.ProcessRunner.<init>(ProcessRunner.java:49)
          at net.stefankrause.jbpm.tests.TimerPersistence.testTimerPersistence(TimerPersistence.java:34)
          at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
          at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
          at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
          at java.lang.reflect.Method.invoke(Method.java:597)
          at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
          at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
          at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
          at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
          at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
          at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
          at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
          at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
          at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
          at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
          at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
          at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
          at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
          at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
          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)
Caused by: java.lang.reflect.InvocationTargetException
          at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
          at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
          at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
          at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
          at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommanService(KnowledgeStoreServiceImpl.java:86)
          ... 28 more
Caused by: java.lang.RuntimeException: Unable to load session snapshot
          at org.drools.persistence.SessionMarshallingHelper.loadSnapshot(SessionMarshallingHelper.java:96)
          at org.drools.persistence.SingleSessionCommandService.initKsession(SingleSessionCommandService.java:229)
          at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:177)
          ... 33 more
Caused by: java.lang.NullPointerException
          at org.drools.common.ConcurrentNodeMemories.getNodeMemory(ConcurrentNodeMemories.java:65)
          at org.drools.common.AbstractWorkingMemory.getNodeMemory(AbstractWorkingMemory.java:1040)
          at org.drools.marshalling.impl.InputMarshaller.readSession(InputMarshaller.java:231)
          at org.drools.marshalling.impl.InputMarshaller.readSession(InputMarshaller.java:203)
          at org.drools.marshalling.impl.DefaultMarshaller.unmarshall(DefaultMarshaller.java:92)
          at org.drools.persistence.SessionMarshallingHelper.loadSnapshot(SessionMarshallingHelper.java:91)
          ... 35 more
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