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" To view the discussion, visit: https://community.jboss.org/message/722605#722605 -------------------------------------------------------------- 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. -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/722605#722605] Start a new discussion in jBPM at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]