[jboss-dev-forums] [Design of JBoss jBPM] - custom node-type derived from superstate produces hibernate

[hackerdan]

Hello,

I'm trying to create a custom node type called my-step which should be a container like super-state.

I'm using jbpm-3.1.4 and set up the junit test case scenario from the documentation, chapter "3.2. Database example". I changed the method "deployProcessDefinition": i switched "JbpmContext jbpmContext = jbpmConfiguration.createJbpmContext();" to be the first statement in this method, so that "...ProcessDefinition.parseXmlString..." uses the config defined in the unit test and not some default settings. Then I changed the config to point to my node-types.xml where I added this line:
<node-type element="my-step" class="test.Step" />
The class looks like this:

  | package test;
  | 
  | import org.jbpm.graph.def.SuperState;
  | 
  | public class Step extends SuperState {
  | 
  | 	private static final long serialVersionUID = 1L;
  | 
  | 	public Step() {
  | 		System.err.println("Hello there.");
  | 	}
  | 
  | 	public Step(String name) {
  | 		super(name);
  | 		System.err.println("Hello: " + name);
  | 	}
  | }
  | 

I changed the process definition and wrapped the state into super-state.
When I run it, everything works as expected.
When I change super-state into my-state, I get the following hibernate exception (shortened) after my output "Hello there.":

  | org.jbpm.persistence.JbpmPersistenceException: couldn't commit hibernate session
  | ...
  | Caused by: org.hibernate.HibernateException: instance not of expected entity type: test.Step is not a: org.jbpm.graph.def.Node
  | ...
  | 

I don't understand this. Step extends SuperState and SuperState extends Node, so Step is a Node - isn't it?
Do I need a hibernate mapping for my class? What should it look like?
Maybe it is not supported to extend SuperState? I don't like to copy the SuperState class. In fact it is not possible because the class uses the superstate field from Node which is not accessible from a copy...

What can I do?
Is it a bug?

-- 
Regards,
Daniel

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