0 Replies Latest reply on Dec 11, 2011 10:39 PM by Zeliang Huang

    Joining JBPM transaction with my current application's transaction

    Zeliang Huang Newbie

      Hi Guys,

       

      I am quite inexperienced with JTA & JPA. I am trying to join JBPM5.1 transaction with my current application's transaction.

       

      In my current application, I had obtained the transaction using things like this:

      building the sessionFactotry:

      //my current application uses the hibernate.cfg.xml 
      Configuration config = new Configuration().configure();
      SessionFactory factory =  new Configuration().configure().buildSessionFactory();
      

       

      Usering the session factory:

      factory.getCurrentSession().beginTransaction();
      //do CRUD
      factory.getCurrentSession().commit();
      

       

       

      In the persistence.xml of jbpm-persistence-jpa-5.1.0.Final.jar I had put this. (I had put the same datasource as my current application's)

      <?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/persistence_1_0.xsd
                                       http://java.sun.com/xml/ns/persistence/orm http://java.sun.com/xml/ns/persistence/orm_1_0.xsd"
          xmlns:orm="http://java.sun.com/xml/ns/persistence/orm" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xmlns="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>same-datasource-as-my-current-applications</jta-data-source>
              <class>org.drools.persistence.info.SessionInfo</class>
              <class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class>
              <class>org.drools.persistence.info.WorkItemInfo</class>
              <class>org.jbpm.process.audit.ProcessInstanceLog</class>
              <class>org.jbpm.process.audit.NodeInstanceLog</class>
              <class>org.jbpm.process.audit.VariableInstanceLog</class>
              <properties>
                  <property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect" />
                  <property name="hibernate.max_fetch_depth" value="3" />
              <!--     <property name="hibernate.hbm2ddl.auto" value="update" />  -->
                  <property name="hibernate.show_sql" value="false" />
                  <property name="hibernate.transaction.manager_lookup_class"
                      value="org.hibernate.transaction.WeblogicTransactionManagerLookup" />
              </properties>
          </persistence-unit>
      </persistence>
      

       

      In my JBPM StatefulKnowledgeSession creation, I had done something like this.

       

      Environment env = KnowledgeBaseFactory.newEnvironment();
      env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, emf);
      StatefulKnowledgeSession session = JPAKnowledgeService.newStatefulKnowledgeSession(knowledgebase, null, env);
      

       

      I am able to manage transactions of both side separately by doing something like:

      //commit to my application tables first
      factory.getCurrentSession().beginTransaction();
      //do CRUD
      factory.getCurrentSession().commit();
      
      //then commit to jbpm tables. 
      UserTransaction ut = (UserTransaction) new InitialContext().lookup("java:comp/UserTransaction");
      ut.begin();
      ....
      ut.commit();
      

       

      This is working ok. But I prefer to combine the two transaction into one since they are supposed to be one work-unit.

       

      I had been trying for a week but to no avail. I am also quite confused with the fact that some hibernate apps are using hibernate.cfg.xml and some are using JPA specific persistence.xml . There are multiple copies of these XML files in different jars. I just couldn't get the whole picture out of all these things. Any help is greately appreciated !