1 Reply Latest reply on Sep 20, 2013 1:35 AM by swiderski.maciej

    How to join a JBPM5 transaction in a standalone web design?

    mvermand
    mvermand Sep 18, 2013 3:53 AM

      Hi,

       

      I'm using the JBPM 5.2 jars inside a webapp that runs on a JBoss AS 7.

      jbpmEmf = Persistence.createEntityManagerFactory("org.jbpm.persistence.jpa"));

       

      JBPM works fine.

      Now I want to create custom JPA entities and manipulate these together with the JBPM entities.

      Example: when a requests comes to start an instance of a Process, I want to store the external Id that is provided in the request because in that way I can reload the specific kbase and ksession when later on a sequential request is made with the same external Id as argument.

       

      My problem is that I do not know how to join the transaction that will be used by JBPM to create the process instance entity and workitem entities...

       

      I extended the persistence.xml:

       

      <persistence-unit name="org.jbpm.persistence.jpa"
        transaction-type="JTA">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <jta-data-source>jdbc/WmsFlow</jta-data-source>
        <mapping-file>META-INF/JBPMorm.xml</mapping-file>
        <mapping-file>META-INF/Taskorm.xml</mapping-file>
        <mapping-file>META-INF/ProcessInstanceInfo.hbm.xml</mapping-file>
        <class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class>
        <class>org.drools.persistence.info.SessionInfo</class>
   ...
        <class>org.jbpm.task.OnParentAbortAllSubTasksEndStrategy</class>
        <class>org.jbpm.task.OnAllSubTasksEndParentEndStrategy</class>
        <class>org.jbpm.task.User</class>

        <!-- START OF WMS ENTITIES -->
        <class>be.wms.DeploymentProperty</class>
        <class>be.wms.Deployment</class>
        <class>be.wms.Scenario</class>
        <class>be.wms.ScenarioInstanceLog</class>
        <class>be.wms.Artifact</class>
        <class>be.wms.ItemEvent</class>
        <class>be.wms.SessionLookup</class>        
        <!-- END OF WMS ENTITIES -->


        <properties>
            <property name="hibernate.max_fetch_depth" value="3" />
            <property name="hibernate.hbm2ddl.auto" value="none" />
            <property name="hibernate.show_sql" value="false" />
            <property name="hibernate.transaction.manager_lookup_class"
                value="org.hibernate.transaction.JBossTransactionManagerLookup" />
            <property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect" />
        </properties>
    </persistence-unit>

       

      I have created a EntityManagerFactory:

      jbpmEmf = Persistence.createEntityManagerFactory("org.jbpm.persistence.jpa");

       

      Now, before I start a new process instance, I want to store the external Id in the same JTA transaction as will be used by JBPM.

      I have a REST resource in my app that is called to start a process instance:

       

      (simplified code:)

      @PUT
@Path("/{name}/{version}")
@Produces(MediaType.APPLICATION_JSON)
public ScenarioInstance startProcessInstance(@PathParam("name") String name, @PathParam("version") String version,
        Map<String, Object> params) {
   
    String externalId = params.get("externalid").toString();
   
    KnowledgeBase kbase = buildKnowledgeBase(name, version); // support for different versions.
   
    // jbpmEmf is a EntityMananagerFactory created from "org.jbpm.persistence.jpa"
    StatefulKnowledgeSession ksession = JPAKnowledgeService.newStatefulKnowledgeSession(kbase, null, createEnvironment(jbpmEmf));
    int ksessionId = ksession.getId();
   
    WMSSession wsession = new WMSSession(externalId, ksessionId);
   
    //=> how to get the EntityManager used by JBPM to persist wsession?
    EntityManager em = ??? <===
    em.persist(wsession);
   
    ProcessInstance processInstance = ksession.startProcess(processId, params);
   
    ...
}

/**
* Create a new environment
* @param emf the EntityManagerFactory
* @return new Environment
* @throws NamingException
*/
protected static Environment createEnvironment(EntityManagerFactory emf) throws NamingException {
    Environment env = KnowledgeBaseFactory.newEnvironment();
    env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, emf);
    env.set(EnvironmentName.TRANSACTION_MANAGER, getTransactionManager());
    return env;
}

       

      So my question is: (line 17): how to get the EntityManager uwed by JBPM to persist the wsession object?

       

      Thanks,

      Michiel