I'm stumped. I'm trying to implement persistence with Drools-flow, and I'd like to grab the value of a property on a workitem / processinstance, but everytime I try to get the workitem or process instance I end up with the stack trace below. <br>
<br>I'm walking through the source and from what I can tell, this happens anytime I try and grab a property that is annotated with @Lob in an entity class.<br><br>My environment is hibernate/mysql/JPA persistence using BTM as a transaction manager. <br>
<br>These are the relevant lines of code: <br><br> ksession = JPAKnowledgeService.loadStatefulKnowledgeSession(ksession.getId(), m_kbase , null, m_environment); <br> m_pi = ksession.getProcessInstance(m_pi.getId());<br>
<br>What am I doing wrong?<br><br><pre><br><code><br>java.lang.NullPointerException<br> at java.io.ByteArrayInputStream.<init>(ByteArrayInputStream.java:89)<br> at org.drools.persistence.processinstance.ProcessInstanceInfo.getProcessInstance(ProcessInstanceInfo.java:135)<br>
at org.drools.persistence.processinstance.JPAProcessInstanceManager.getProcessInstance(JPAProcessInstanceManager.java:62)<br> at org.drools.common.AbstractWorkingMemory.getProcessInstance(AbstractWorkingMemory.java:1793)<br>
at org.drools.impl.StatefulKnowledgeSessionImpl.getProcessInstance(StatefulKnowledgeSessionImpl.java:261)Hibernate: select at org.drools.command.runtime.process.GetProcessInstanceCommand.execute(GetProcessInstanceCommand.java:29)<br>
at org.drools.command.runtime.process.GetProcessInstanceCommand.execute(GetProcessInstanceCommand.java:12)<br> at org.drools.persistence.session.SingleSessionCommandService.execute(SingleSessionCommandService.java:254)<br>
at org.drools.command.impl.CommandBasedStatefulKnowledgeSession.getProcessInstance(CommandBasedStatefulKnowledgeSession.java:95)<br> at com.thoughtvine.tracks.workflow.TracksFlow.getParameterFromWorkItem(TracksFlow.java:182)<br>
at com.thoughtvine.tracks.workflow.test.TestTracksFlow.testGetWorkItem(TestTracksFlow.java:118)<br> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)<br> at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)<br>
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)<br> at java.lang.reflect.Method.invoke(Method.java:597)<br> at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)<br>
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)<br> at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)<br> at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)<br>
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)<br> at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)<br> at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:73)<br>
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:46)<br> at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:180)<br> at org.junit.runners.ParentRunner.access$000(ParentRunner.java:41)<br>
at org.junit.runners.ParentRunner$1.evaluate(ParentRunner.java:173)<br> at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)<br> at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)<br>
at org.junit.runners.ParentRunner.run(ParentRunner.java:220)<br> at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)<br> at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)<br>
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)<br> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)<br> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)<br>
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)<br></code><br></pre><br><br>