[jboss-user] [JBoss jBPM] - fail to send parameter to a function in xhtml

[handsomeli]

I can modify the properties of task and let it saved in database , the same as the sample jboss-seam-todo does: 
  | <h:inputText value="#{task.description}" size="16" />	 
  | 

However, I fail to save variables of a task in database(I can only modify it in memory, next time the user login , he can not see the modification anymore!) 

  | <h:inputText value="#{task.variables['event'].desc}" size="16" />	 

where 'event' come from Code: 

  | @Stateless
  | @Name("eventmake")
  | public class MakeAction implements Make, Serializable {
  |     
  |     @Out(scope=ScopeType.BUSINESS_PROCESS, required=false)
  | 	Event event = new Event();
  | 
  | 	@CreateProcess(definition = "itsm")
  | 	public String make() {
  | 		return "login";
  | 	}
  | 
  | 	public Event getEvent() {
  | 		return event;
  | 	}
  | 
  | 	public void setEvent(Event event) {
  | 		this.event = event;
  | 	}
  | 
  | }
  | 	 


What should i do? 
I have asked this question in 'Jboss seam' , but they tell me to ask it here.
Thanks !

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