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1. Re: Null cmdScopedEntityManager during stateful session load
swiderski.maciej Jun 28, 2012 6:10 PM (in response to biraneto)could you upload your process definition and some details about your environment setup so we could verify if that is an issue or any configuration is missing?
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2. Re: Null cmdScopedEntityManager during stateful session load
biraneto Jun 29, 2012 12:55 PM (in response to swiderski.maciej)I'm using jbpm 5.3 on tomcat with spring and Bitronix. Postgres DB.
My environment is being created like this:
EntityManagerFactory emf = Persistence.createEntityManagerFactory("com.framework.jpa");
Environment env = KnowledgeBaseFactory.newEnvironment();
env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, emf);
env.set(EnvironmentName.TRANSACTION_MANAGER, TransactionManagerServices.getTransactionManager());
env.set(EnvironmentName.TRANSACTION, ut);
return env;
The process definition is not big... there is a lot of calls from my framework which I must say call no Jbpm methods. The important part is the two conditionalEvents that lead to one line of execution reach the end event and the other being blocked. When restarting the server the deserialization fails.
<?xml version="1.0" encoding="UTF-8"?>
<definitions id="Definition"
targetNamespace="http://jbpm.org/example/bpmn2"
typeLanguage="http://www.java.com/javaTypes"
xmlns:java="http://drools.org/semantics/java"
expressionLanguage="http://www.mvel.org/2.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.omg.org/spec/BPMN/20100524/MODEL BPMN20.xsd"
xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"
xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI"
xmlns:dc="http://www.omg.org/spec/DD/20100524/DC"
xmlns:di="http://www.omg.org/spec/DD/20100524/DI"
xmlns:tns="http://www.jboss.org/drools">
<itemDefinition id="CTX_PROCESS_IDItem" structureRef="java.lang.Long" />
<process processType="Private" isExecutable="true"
id="conditionalTest_2_0" tns:packageName="defaultPackage" name="conditionalTest_2.0" >
<extensionElements>
<tns:import name="com.entities.*" />
<tns:import name="com.core.services.ServicePkAspect" />
</extensionElements>
<property id="CTX_PROCESS_ID" itemSubjectRef="tns:CTX_PROCESS_IDItem"/>
<endEvent id="id_3" name="id_3" ><incoming>id_17</incoming>
</endEvent>
<scriptTask id="id_7" name="id_7" ><incoming>id_10</incoming>
<outgoing>id_16</outgoing>
<script>ServicePkAspect.processAroundExecute("workflowServicePk", "executeRule", null, new String[]{"testRuleParam","testRuleParam","132710"}, CTX_PROCESS_ID);</script>
</scriptTask>
<exclusiveGateway id="id_6" name="id_6" gatewayDirection="Converging"><incoming>id_12</incoming>
<incoming>id_11</incoming>
<outgoing>id_17</outgoing>
</exclusiveGateway>
<scriptTask id="id_2" name="id_2" ><incoming>id_13</incoming>
<outgoing>id_10</outgoing>
<script> ServicePkAspect.processAroundExecute("workflowServicePk", "executePrepareTestRule", null, null, CTX_PROCESS_ID); return true; </script>
</scriptTask>
<startEvent id="id_4" name="id_4"><outgoing>id_13</outgoing>
</startEvent>
<parallelGateway id="id_8" name="id_8" gatewayDirection="Diverging"><incoming>id_16</incoming>
<outgoing>id_14</outgoing>
<outgoing>id_15</outgoing>
</parallelGateway>
<intermediateCatchEvent id="id_5" name="id_5">
<incoming>id_15</incoming>
<outgoing>id_12</outgoing>
<conditionalEventDefinition>
<condition xsi:type="tFormalExpression" > UserPk(idUser > 150)
</condition>
</conditionalEventDefinition>
</intermediateCatchEvent>
<intermediateCatchEvent id="id_9" name="id_9">
<incoming>id_14</incoming>
<outgoing>id_11</outgoing>
<conditionalEventDefinition>
<condition xsi:type="tFormalExpression" > UserPk(idUser <= 150)
</condition>
</conditionalEventDefinition>
</intermediateCatchEvent>
<sequenceFlow id="id_14" name="id_14" sourceRef="id_8" targetRef="id_9" > </sequenceFlow>
<sequenceFlow id="id_11" name="id_11" sourceRef="id_9" targetRef="id_6" > </sequenceFlow>
<sequenceFlow id="id_13" name="id_13" sourceRef="id_4" targetRef="id_2" > </sequenceFlow>
<sequenceFlow id="id_16" name="id_16" sourceRef="id_7" targetRef="id_8" > </sequenceFlow>
<sequenceFlow id="id_17" name="id_17" sourceRef="id_6" targetRef="id_3" >
<conditionExpression xsi:type="tFormalExpression">
return true;
</conditionExpression> </sequenceFlow>
<sequenceFlow id="id_12" name="id_12" sourceRef="id_5" targetRef="id_6" > </sequenceFlow>
<sequenceFlow id="id_15" name="id_15" sourceRef="id_8" targetRef="id_5" > </sequenceFlow>
<sequenceFlow id="id_10" name="id_10" sourceRef="id_2" targetRef="id_7" > </sequenceFlow>
</process>
</definitions>
When restarting the server with
ksession = JPAKnowledgeService.loadStatefulKnowledgeSession(sessionId, kbase, null, env );
I get the exception below caused by a null pointer exception as already mentioned on the first post. Maybe it is worth to mention that the var appScopedEntityManager is initialized.
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:253)
at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:195)
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.buildCommandService(KnowledgeStoreServiceImpl.java:101)
at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.loadStatefulKnowledgeSession(KnowledgeStoreServiceImpl.java:84)
at org.drools.persistence.jpa.JPAKnowledgeService.loadStatefulKnowledgeSession(JPAKnowledgeService.java:131)
at com.perkons.frameworkpk.fpk.core.workflows.WorkflowManagerPk.loadStatefulSession(WorkflowManagerPk.java:403)
at com.perkons.frameworkpk.fpk.core.workflows.WorkflowManagerPk.initialize(WorkflowManagerPk.java:120)
at com.perkons.frameworkpk.fpk.core.ContextLoaderListenerPk.contextInitialized(ContextLoaderListenerPk.java:92)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4205)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4704)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:799)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:779)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:601)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:675)
at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:601)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:502)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1315)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:324)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1061)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
at org.apache.catalina.core.StandardService.start(StandardService.java:525)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
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.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: java.lang.NullPointerException
at org.jbpm.persistence.JpaProcessPersistenceContext.getProcessInstancesWaitingForEvent(JpaProcessPersistenceContext.java:35)
at org.jbpm.persistence.processinstance.JPASignalManager.getProcessInstancesForEvent(JPASignalManager.java:40)
at org.jbpm.persistence.processinstance.JPASignalManager.signalEvent(JPASignalManager.java:23)
at org.jbpm.process.instance.ProcessRuntimeImpl$2.activationCreated(ProcessRuntimeImpl.java:340)
at org.drools.impl.StatefulKnowledgeSessionImpl$AgendaEventListenerWrapper.activationCreated(StatefulKnowledgeSessionImpl.java:643)
at org.drools.event.AgendaEventSupport.fireActivationCreated(AgendaEventSupport.java:41)
at org.drools.common.DefaultAgenda.createActivation(DefaultAgenda.java:601)
at org.drools.reteoo.RuleTerminalNode.assertLeftTuple(RuleTerminalNode.java:257)
at org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:196)
at org.drools.reteoo.SingleLeftTupleSinkAdapter.createAndPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:145)
at org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:154)
at org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:141)
at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497)
at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382)
at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235)
at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240)
at org.drools.marshalling.impl.ProtobufInputMarshaller.assertHandleIntoOTN(ProtobufInputMarshaller.java:483)
at org.drools.marshalling.impl.ProtobufInputMarshaller.readFactHandles(ProtobufInputMarshaller.java:459)
at org.drools.marshalling.impl.ProtobufInputMarshaller.readSession(ProtobufInputMarshaller.java:259)
at org.drools.marshalling.impl.ProtobufInputMarshaller.readSession(ProtobufInputMarshaller.java:161)
at org.drools.marshalling.impl.ProtobufMarshaller.unmarshall(ProtobufMarshaller.java:117)
at org.drools.persistence.SessionMarshallingHelper.loadSnapshot(SessionMarshallingHelper.java:91)
... 36 more
And finally... here is a screen of the moment the JpaProcessPersistenceContextManager is initialized using the cmdScopedEntityManager which is null
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3. Re: Null cmdScopedEntityManager during stateful session load
swiderski.maciej Jun 29, 2012 1:44 PM (in response to biraneto)1 of 1 people found this helpfuldo you mange transaction your self? If not remove UT from the environment and let jbpm to handle transactions internally.
HTH
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4. Re: Null cmdScopedEntityManager during stateful session load
biraneto Jun 29, 2012 4:02 PM (in response to swiderski.maciej)Unfortunately, not passing the transaction is not a good option for me as I don't want to use and have to setup jndi on a specific server (I want to abstract this issues)
What solved for me was to bypass the current JpaProcessPersistenceContextManager implementation (which may still have a bug... I would make some tests).
I changed my environment initialization to
env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, emf);
env.set(EnvironmentName.TRANSACTION, ut);
env.set(EnvironmentName.TRANSACTION_MANAGER,
new JtaTransactionManager( ut, null, TransactionManagerServices.getTransactionManager() ));
env.set(EnvironmentName.PERSISTENCE_CONTEXT_MANAGER, new JPAProcessPersistenceContextManagerPk(env));
On my JPAProcessPersistenceContextManagerPk (extends JpaProcessPersistenceContextManager) I overrided the current getProcessPersistenceContext to the implementation below
public ProcessPersistenceContext getProcessPersistenceContext() {
if (cmdScopedEntityManager == null) {
this.beginCommandScopedEntityManager();
}
return new JpaProcessPersistenceContext( cmdScopedEntityManager );
}