[jboss-dev-forums] [jBPM Development] - Confused about JBPM and knowledge agents

[Charlie Kuharski]

Charlie Kuharski [https://community.jboss.org/people/ckuharski] created the discussion

"Confused about JBPM and knowledge agents"

To view the discussion, visit: https://community.jboss.org/message/743791#743791

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I'm new to this and I'm pretty much confused.  I'm missing some basic concepts.
I'm trying to interact with the JBPM server at the API level via a proxy.  I don't want the proxy to become the JBPM server.

1) The code below works:
// code snippet
 @Test
public void simpleExecution() {
ProcessInstance processInstance = ksession.startProcess("org.jbpm.test");
long processInstance1Id = processInstance.getId();
Assert.assertEquals(ProcessInstance.STATE_ACTIVE, processInstance.getState());
ksession.signalEvent("continueSignal", null, processInstance1Id);
Assert.assertEquals(ProcessInstance.STATE_COMPLETED, processInstance.getState());
}



1) I'm trying to integrate with an existing application and the consultants ( I believe them) have a project that does the same basic steps but needs persistence.xml local to the project in addition to the persistence.xml on the server.
/*
           * Create EntityManagerFactory and register it in the environment Create the
           * knowledge session that uses JPA to persists runtime state
           */

          public static StatefulKnowledgeSession createSession() throws Exception {

                    KnowledgeBase kbase = readKnowledgeBase("SimpleHTForm.bpmn2");
        emf = Persistence.createEntityManagerFactory( "org.jbpm.persistence.jpa" );
        Environment env = KnowledgeBaseFactory.newEnvironment();
        env.set( EnvironmentName.ENTITY_MANAGER_FACTORY, emf );
        env.set( EnvironmentName.TRANSACTION_MANAGER, TransactionManagerServices.getTransactionManager() );
        env.set( EnvironmentName.GLOBALS, new MapGlobalResolver() );


        Properties properties = new Properties();
        properties.put("drools.processInstanceManagerFactory", "org.jbpm.persistence.processinstance.JPAProcessInstanceManagerFactory");
        properties.put("drools.processSignalManagerFactory", "org.jbpm.persistence.processinstance.JPASignalManagerFactory");
        KnowledgeSessionConfiguration config = KnowledgeBaseFactory.newKnowledgeSessionConfiguration(properties);


        return JPAKnowledgeService.newStatefulKnowledgeSession(kbase, config, env);
          }


What is this actually doing?  Is this persisting around te JBPM server?  Is the proxy becoming its own JBPM server?  An I really interacting with JBPM or just using the classes locally and saving to the datasource?  See the test example above.  There is no server running for the test.

I've played with the demos and that makes sense.  Interacting with an existing JBPM is very confusing.
Any direction would be greatly appreciated.
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