[jboss-user] [jBPM] - InvocationTargetException when creating StatefulKnowledgeSession public StatefulKnowledgeSession createNewKnowledgeSession() { // create a new knowledge session that uses JPA to store the runtime state StatefulKnowledgeSession kSession = null; try

[Tim Kutz]

Tim Kutz [https://community.jboss.org/people/tim.kutz] created the discussion

"InvocationTargetException when creating StatefulKnowledgeSession 	public StatefulKnowledgeSession createNewKnowledgeSession() 	{ 		// create a new knowledge session that uses JPA to store the runtime state 		StatefulKnowledgeSession kSession = null; 		try"

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Hello - 

I've been wrestling with this for about a day and a half, now.  My environment is jBPM 5.2.0.Final, running on JBoss 5.1.0.GA, with Java 1.5.0_12, under 64-bit Windows 7.  It's entirely possible that I am missing some portion of configuration, but I'm not able to determine what it is, exactly, that I'm missing.

I am attempting to create a new StatefulKnowledgeSession, and start a process with it, using the JPAKnowledgeService, as described in the documentation.  The code I am using to do this is as follows: 

 KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
 kbuilder.add(ResourceFactory.newClassPathResource("ImmunizationProcess.bpmn"), ResourceType.BPMN2);
 kbuilder.add(ResourceFactory.newClassPathResource("SchoolFormProcess.bpmn"), ResourceType.BPMN2);
 kbuilder.add(ResourceFactory.newClassPathResource("LegacySubscriptionProcess.bpmn"), ResourceType.BPMN2);
 kbuilder.add(ResourceFactory.newClassPathResource("SubscriptionMasterProcess.bpmn"), ResourceType.BPMN2);

  kBase = kbuilder.newKnowledgeBase();

  // create the entity manager factory and register it in the environment  

EntityManagerFactory emf =     Persistence.createEntityManagerFactory( "org.jbpm.persistence.jpa" );
 env = KnowledgeBaseFactory.newEnvironment();
 env.set( EnvironmentName.ENTITY_MANAGER_FACTORY, emf );
 env.set( EnvironmentName.TRANSACTION_MANAGER, jtaManager); 

kSession =  JPAKnowledgeService.newStatefulKnowledgeSession( kBase, null, env );

When it reaches this last line, it throws an InvocationTargetException, which I've managed to narrow down to the constructor call on SingleSessionCommandService, which appears to not exist:

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:494)
          at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommandService(KnowledgeStoreServiceImpl.java:129)
          ... 85 more

The persistence.xml I've put in place for the JPA persistence looks like this: 
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
  <persistence
  version="1.0"
  xsi:schemaLocation=
    " http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence
      http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd
      http://java.sun.com/xml/ns/persistence/orm http://java.sun.com/xml/ns/persistence/orm
      http://java.sun.com/xml/ns/persistence/orm_1_0.xsd http://java.sun.com/xml/ns/persistence/orm_1_0.xsd"
  xmlns:orm=" http://java.sun.com/xml/ns/persistence/orm http://java.sun.com/xml/ns/persistence/orm"
  xmlns:xsi=" http://www.w3.org/2001/XMLSchema-instance http://www.w3.org/2001/XMLSchema-instance"
  xmlns=" http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence">

  <persistence-unit name="org.jbpm.persistence.jpa" transaction-type="JTA">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <jta-data-source>java:DefaultDS</jta-data-source>
    <mapping-file>META-INF/JBPMorm.xml</mapping-file>
    <class>org.drools.persistence.info.SessionInfo</class>
    <class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class>
    <class>org.drools.persistence.info.WorkItemInfo</class>

    <properties>
      <property name="hibernate.dialect" value="org.hibernate.dialect.OracleDialect"/>
      <property name="hibernate.max_fetch_depth" value="3"/>
      <property name="hibernate.hbm2ddl.auto" value="update"/>
      <property name="hibernate.show_sql" value="true"/>
      <property name="hibernate.transaction.manager_lookup_class"
                value="org.hibernate.transaction.JBossTransactionManagerLookup"/> 
    </properties>
  </persistence-unit>
</persistence>

Any and all help would be appreciated, and I can provide additional information if needed.
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