Philippe Goncalves [http://community.jboss.org/people/filipon] created the discussion "Drools persistence + Websphere 7 + DB2" To view the discussion, visit: http://community.jboss.org/message/599266#599266 -------------------------------------------------------------- Hi everyone, I'm trying to get the persistence of drools flow working in a Websphere 7 + DB2 environment: - If I run a simple workflow that runs without any wait state, it's ok, I have no errors. SessionInfo is well persisted. - If I run a workflow with a wait state (First launch well persisted), after completing this wait state and before finishing the workflow, I have an error at line 41 of class JPAWorkItemManager: ((WorkItemImpl) workItem).setId(workItemInfo.getId()); // -> Nullpointer exception because of the the null returned by workItemInfo.getId() - If I run a workflow running (For example one with a wait state) and if I try to run another workflow in parallel, I have an error at line 141 of class SingleSessionCommandService: ((InternalKnowledgeRuntime) ksession).setId( this.sessionInfo.getId() ); // -> Nullpointer exception because of the the null returned by this.sessionInfo.getId() After invesgating, it seems that I have a problem once the database is locked by a process,  the persists methods from drools don't work anymore for the autogenerated columns of the tables, and then I have problems with tables SessionInfo, WorkItemInfo, etc. About the way I instantiate the environment variable for the persistence, I make it singleton: ...     public static Environment getEnvironment() {         if (environment == null) {             EntityManagerFactory emf = Persistence.createEntityManagerFactory("testWorkflow");             environment = KnowledgeBaseFactory.newEnvironment();             environment.set(EnvironmentName.ENTITY_MANAGER_FACTORY, emf);         }         return environment;     } ... Here is my persistence.xml: <persistence 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"     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"     version="1.0"> <persistence-unit name="testWorkflow" transaction-type="JTA">         <provider>org.hibernate.ejb.HibernatePersistence</provider>         <jta-data-source>jdbc/testWorkflow</jta-data-source>         <class>org.drools.persistence.info.SessionInfo</class>         <class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class>         <class>org.jbpm.persistence.processinstance.ProcessInstanceEventInfo</class>         <class>org.drools.persistence.info.WorkItemInfo</class>         <properties>             <property name="hibernate.dialect" value="org.hibernate.dialect.DB2Dialect" />             <property name="hibernate.max_fetch_depth" value="5" />             <property name="hibernate.transaction.manager_lookup_class" value="org.hibernate.transaction.WebSphereExtendedJTATransactionLookup" />           <property name="hibernate.hbm2ddl.auto" value="update" />             <property name="show_sql" value="true" />         </properties> </persistence-unit> </persistence> Thanks for your help! -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/599266#599266] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]