[jboss-user] [JBoss jBPM] - Re: Hibernate Error when persist the outer ProcessInstance.

[kenees]

"boercher" wrote : Obviously creation of ProcessInstances involves the database. I've looked up the ProcessInstance constructor:
  | 
  |   public ProcessInstance(ProcessDefinition processDefinition, Map<String, Object> variables, String key)
  |   |   {
  |   |     [...]
  |   |     // if this process instance is created in the context of a persistent operation
  |   |     Services.assignId(this);
  |   |     [...]
  |   |   }
  |   | 
  | You are surely operating in the context of a persistent operation so this call to this static method of Services (I guess these are the services from the jbpm.cfg.xml) will do some Hibernate stuff.
  | 
  | Since jBPM heavily relies on a database for everything (transaction safety, logging, ...) I would guess that it will be hard to work around that by other means than by crude hacks.
  | 
  | Volker

Yes, Volker, you are right. What I have to do is to extend from the ProcessInstance to create a new type of ProcessInstance -- NonPersistProcessInstance. Code would like:

  | public NonPersistProcessInstance(ProcessDefinition processDefinition,
  | 			Map variables, String key) {
  | 
  | 		if (processDefinition == null)
  | 			throw new JbpmException(
  | 					"can't create a process instance when processDefinition is null");
  | 
  | 		// initialize the members
  | 		this.processDefinition = processDefinition;
  | 		this.rootToken = new Token(this);
  | 		this.start = Clock.getCurrentTime();
  | 		this.key = key;
  | 
  | 		// if this process instance is created in the context of a persistent
  | 		// operation
  | 		// DO NOT PERSIST
  | 		//Services.assignId(this);
  | 
  | 		// create the optional definitions
  | 		Map definitions = processDefinition.getDefinitions();
  | 		// if the state-definition has optional definitions
  | 		if (definitions != null) {
  | 			instances = new HashMap();
  | 			// loop over each optional definition
  | 			Iterator iter = definitions.values().iterator();
  | 			while (iter.hasNext()) {
  | 				ModuleDefinition definition = (ModuleDefinition) iter.next();
  | 				// and create the corresponding optional instance
  | 				ModuleInstance instance = definition.createInstance();
  | 				if (instance != null) {
  | 					addInstance(instance);
  | 				}
  | 			}
  | 		}
  | 
  | 		// add the creation log
  | 		rootToken.addLog(new ProcessInstanceCreateLog());
  | 
  | 		// set the variables
  | 		ContextInstance contextInstance = getContextInstance();
  | 		if ((contextInstance != null) && (variables != null)) {
  | 			contextInstance.addVariables(variables);
  | 		}
  | 
  | 		Node initialNode = rootToken.getNode();
  | 		// fire the process start event
  | 		if (initialNode != null) {
  | 			ExecutionContext executionContext = new ExecutionContext(rootToken);
  | 			processDefinition.fireEvent(Event.EVENTTYPE_PROCESS_START,
  | 					executionContext);
  | 
  | 			// execute the start node
  | 			initialNode.execute(executionContext);
  | 		}
  | 
  | 	}
  | 

I commented the "assignId" method call in the constructor, this seems to be rude, but I don't know if there is any better idea...

Thank you Volker.

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