Help:type of nodes returned by root.getNode() is unnarrowed

[gmournos]

I have created a custom node type and I need to cast to it during the workflow execution.
However, when I cast the result of calling token.getNode() to my custom type, I get a ClassCastException, although the token is at my custom node at the time.

My code is complicated so I created a simple test case, and added it to the already existing GraphSessionDbTest.java (basically I just added three assertions to the existing test case).
The test case breaks, in the third assertion. The node has name 's' but it is not an instance of StartState...

// added to jbpm-3.1/src/java.jbpm.test/org/jbpm/db/GraphSessionDbTest.java

 public void testUpdateProcessInstance2() {
 ProcessDefinition processDefinition = ProcessDefinition.parseXmlString(
 "<process-definition>" +
 " <start-state name='s' />" +
 " <node name='n' />" +
 "</process-definition>");

 processDefinition = saveAndReload(processDefinition);

 ProcessInstance processInstance = new ProcessInstance(processDefinition);

 processInstance = saveAndReload(processInstance);
 long pid = processInstance.getId();

 //this is the actual part added to the already existing testUpdateProcessInstance() case
 assertNotNull(processInstance.getRootToken().getNode());
 assertTrue(processInstance.getRootToken().getNode() instanceof Node);
 assertTrue(processInstance.getRootToken().getNode() instanceof StartState);

 assertEquals("s", processInstance.getRootToken().getNode().getName());
 processInstance.getRootToken().setNode(processInstance.getProcessDefinition().getNode("n"));

 processInstance = saveAndReload(processInstance);
 assertEquals("n", processInstance.getRootToken().getNode().getName());
 assertEquals(pid, processInstance.getId());
 }

Is this normal?
I am not a hibernate expert.
In my normal code (not when I am running the simple test case), during the execution of signal() I get hibernate warnings of the type:

14:01:34,429 [main] WARN StatefulPersistenceContext : Narrowing proxy to class org.jbpm.graph.node.StartState - this operation breaks ==

Are these relevant?

[gmournos]

Looking at the hibernate code, I can see that the last warning is probably irrelevant.
It is thrown by hibernate during a successful narrowing to warn that the new object instance breaks equality...

[gmournos]

I needed to be able to look at the correct type nodes so I finally added an <any instead of a <many-to-one in the hibernate mappings for Token.

This solved my problem...In case someone has the same problem.

[gmournos]

Actually I had the same problem when overriding other jbpm objects, so I finally wrote a method like this to get to the target object from the proxies...

public static Object narrowProxy(Object maybeProxy) {
 if (maybeProxy == null)
 throw new IllegalArgumentException("cannot narrow null");
 if ( maybeProxy instanceof HibernateProxy ) {
 HibernateProxy proxy = (HibernateProxy) maybeProxy;
 LazyInitializer li = proxy.getHibernateLazyInitializer();
 return li.getImplementation();
 //get the real object where the proxy is working on.
 //if the proxy is not initialized then it will be initialized here
 } else
 return maybeProxy;
 }

This code has more to do with hibernate, but if someone extends the Jbpm objects then it might be useful