ProcessState getSubProcessDefinition is null

[don_t]

Hi, I'm trying to access the sub-process child node of a process-state. My test program is listed below. I call getSubProcessDefinition and always get null. Any ideas what I'm doing wrong?

import java.util.HashMap;
import java.util.Map;

import junit.framework.TestCase;

import org.dom4j.Element;
import org.jbpm.graph.def.ProcessDefinition;
import org.jbpm.graph.node.ProcessState;
import org.jbpm.graph.node.SubProcessResolver;

public class TestSubprocess extends TestCase {

 private static class MapBasedProcessRepository implements SubProcessResolver {
 private Map<String,ProcessDefinition> processes =
 new HashMap<String,ProcessDefinition>();

 public void add(ProcessDefinition processDefinition) {
 processes.put(processDefinition.getName(), processDefinition);
 }

 @Override
 public ProcessDefinition findSubProcess(Element element) {
 // TODO Auto-generated method stub
 return processes.get(element.attributeValue("name"));
 }

 }

 public void testProcessInstance() {
 MapBasedProcessRepository subProcessResolver = new MapBasedProcessRepository();
 ProcessDefinition subProcessDefinition = ProcessDefinition.parseXmlString(
 "<process-definition name='sub-p'>" +
 " <start-state>" +
 " <transition to='s' />" +
 " </start-state>" +
 " <state name='s'>" +
 " <transition to='t'/>" +
 " </state>" +
 " <state name='t'>" +
 " <transition to='end'/>" +
 " </state>" +
 " <end-state name='end' />" +
 "</process-definition>"
 );
 subProcessResolver.add( subProcessDefinition );

 subProcessDefinition = ProcessDefinition.parseXmlString(
 "<process-definition name='sub-q'>" +
 " <start-state>" +
 " <transition to='s' />" +
 " </start-state>" +
 " <state name='s'>" +
 " <transition to='t'/>" +
 " </state>" +
 " <state name='t'>" +
 " <transition to='end'/>" +
 " </state>" +
 " <end-state name='end' />" +
 "</process-definition>"
 );
 subProcessResolver.add( subProcessDefinition );

 ProcessDefinition processDefinition = ProcessDefinition.parseXmlString(
 "<process-definition name='super'>" +
 " <start-state name='start'>" +
 " <transition to='p' />" +
 " </start-state>" +
 " <process-state name='p'>" +
 " <sub-process name='sub-p' binding='late'/>" +
 " <transition to='q' />" +
 " </process-state>" +
 " <process-state name='q'>" +
 " <sub-process name='sub_q' binding='late' />" +
 " <transition to='end' />" +
 " </process-state>" +
 " <end-state name='end' />" +
 "</process-definition>"
 );
 subProcessResolver.add( processDefinition );

 ProcessState.setDefaultSubProcessResolver(subProcessResolver);
 ProcessState processState = (ProcessState) processDefinition.getNode("p");
 System.out.println(processState);
 System.out.println(processState.getSubProcessDefinition());

 processState = (ProcessState) processDefinition.getNode("q");
 System.out.println(processState);
 System.out.println(processState.getSubProcessDefinition());
 }
}

[kukeltje]

that might be caused by the binding='late' I think. Try what happens if you start one process or what happens if you remove the binding is late. Not that that is the solution, just curious.

[don_t]

I tried without late binding and got same result. However after looking at the unit test it seems the subprocess need to be set explicitly and the superprocess then persisted in the database.

// create the subprocess
 ProcessDefinition subProcessDefinition = new ProcessDefinition("sub");
 // store the subprocess in the database
 graphSession.saveProcessDefinition(subProcessDefinition);

 // create the super process
 ProcessDefinition superProcessDefinition = ProcessDefinition.parseXmlString(
 "<process-definition name='super'>" +
 " <process-state name='subprocess' />" +
 "</process-definition>");
 // resolve the reference to the subprocess
 ProcessState processState = (ProcessState) superProcessDefinition.getNode("subprocess");
 processState.setSubProcessDefinition(subProcessDefinition);

 // save and reload the superprocess
 superProcessDefinition = saveAndReload(superProcessDefinition);

 processState = (ProcessState) superProcessDefinition.getNode("subprocess");
 assertNotNull("sub", processState.getSubProcessDefinition().getName());

[kukeltje]

hmmm I would not have expected this to be necessary when using your own subprocessresolver... but then again.. I'm not familiar with all the details of jBPM