[jbpm-dev] [Design of JBoss jBPM] - history problem

[galanfish]

i have created a process like this:
JbpmConfiguration environmentFactory = (JbpmConfiguration) getEnvironmentFactory();
  | ProcessService processService = environmentFactory.get(ProcessService.class);
  | ClientProcessDefinition processDefinition = ProcessDefinitionBuilder
  | 	.startProcess("branch_history_problem")
  |     
  | 		.startActivity("start", WaitState.class)
  | 			.initial()
  | 			.transition("forkNode")
  | 		.endActivity()
  |     
  | 		.startActivity("forkNode", ForkActivity.class)		// just as org.jbpm.jpdl.internal.activity.ForkActivity
  | 			.transition("leftWait", "to_left")
  | 			.transition("rightWait", "to_right")
  | 		.endActivity()
  | 		
  | 		.startActivity("leftWait", WaitState.class)
  | 			.transition("leftLogic")
  | 		.endActivity()
  | 		.startActivity("leftLogic", WaitStateMaybeExceptionThrowout.class)	// may throw out exception or call wait for signal, call historyXX inside
  | 			.transition("join")
  | 		.endActivity()
  | 		
  | 		.startActivity("rightWait", WaitState.class)
  | 			.transition("rightLogic")
  | 		.endActivity()
  | 		.startActivity("rightLogic", WaitStateMaybeExceptionThrowout.class)
  | 			.transition("join")
  | 		.endActivity()
  |     
  | 		.startActivity("join", JoinActivity.class)		// just as org.jbpm.jpdl.internal.activity.JoinActivity
  | 			.transition("end", "to_end")
  | 		.endActivity()
  |     
  | 		.startActivity("end", AutomaticActivity.class)
  | 		.endActivity()
  |     
  | 	.endProcess();
  | 
  | /*
  | 			     / leftWait(wait state)  - leftLogic(wait state)  \
  | start(wait state) - forkNode 					    		join - end
  | 			     \ rightWait(wait state) - rightLogic(wait state) /
  | */


then, i created a process instance and made it run, 
when the acitivty moves to Activity("leftLogic", WaitStateMaybeExceptionThrowout.class) or Activity("rightWait", WaitStateMaybeExceptionThrowout.class)
exception throw out: 

Cannot add or update a child row: a foreign key constraint fails (`jbpm_pvm/jbpm_hist_actinst`, CONSTRAINT `FK_HAI_HPI` FOREIGN KEY (`HPI_`) REFERENCES `jbpm_hist_procinst` (`ID_`))
	insertSQL= "/* insert org.jbpm.pvm.internal.history.model.HistoryActivityInstanceImpl */ 
	insert into JBPM_HIST_ACTINST 
	(DBVERSION_, HPI_, ACTIVITY_, EXECUTION_, ACTIVITY_NAME_, START_, END_, DURATION_, TRANSITION_, CLASS_) values (?, ?, ?, ?, ?, ?, ?, ?, ?, 'ACT')"

then i modify the method ActivityStart#process as follow, it seems work ok... 
 .....
  | public void process() {
  | Session session = Environment.getFromCurrent(Session.class);
  | 
  | // modification begins
  | org.jbpm.pvm.internal.model.ExecutionImpl tmp = execution;
  | while(tmp.getParent() != null){
  | tmp = tmp.getParent();
  | }
  | // ends
  | 
  | HistoryProcessInstance historyProcessInstanceImpl = (HistoryProcessInstance) 
  | session.load(HistoryProcessInstanceImpl.class, tmp.getId()/*execution.getId()*/);	//..
  | 
  | HistoryActivityInstanceImpl historyActivityInstanceImpl = 
  | createHistoryActivityInstance(historyProcessInstanceImpl);
  | 
  | session.save(historyActivityInstanceImpl);
  | 
  | execution.setHistoryActivityInstanceDbid(historyActivityInstanceImpl.getDbid());
  | }
  | .....

is there something i missed or?

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