2 Replies Latest reply on Nov 6, 2008 9:30 PM by cosmo

    Seam with jBPM - task(slash)process id may not be null

    naruszef
    naruszef Jul 25, 2008 11:58 AM

      Hi!


      I'm seam beginner and I have got problems with integrating seam with jBPM. (using JBoss AS 4.2 and Seam 2.0.2)


      I have got two Stateful Session Beans:


      @Stateful
@Name("startProcess")
@Scope(ScopeType.BUSINESS_PROCESS)

public class StartProcessBean implements StartProcess{
        @In(value="processInstance", required=false, scope=ScopeType.BUSINESS_PROCESS) 
        @Out(value="processInstance", required=false)
        ProcessInstance processInstance;
                
        @In(value="taskInstance", required=false, scope=ScopeType.BUSINESS_PROCESS)
        @Out(value="taskInstance", required=false)
        TaskInstance taskInstance;
        
        @Begin
        @CreateProcess(definition="todo")
        public String begin(){
                log.info("begining");
                return "success";
        }
        
        @Remove
        public void remove(){
                log.info("removed");
        }
        
        @Logger
        Log log;
}



      and


      @Stateful
@Scope(ScopeType.BUSINESS_PROCESS)
@Name("start")
public class StartMyTaskBean implements StartMyTask {
        
        @Logger
        Log log;
        
        @In(required=false,value="processInstance")
        ProcessInstance processInstance;
        
        @In(required=false,value="taskInstance")
        TaskInstance taskInstance;
        
        
        @StartTask()
        public void beginTask() {
                log.info("Task started");
        }
        
        @EndTask
        public void endTask(){
                log.info("Task ended");
                
        }
        
        @Remove
        public void remove(){
                log.info("Removed");
        }
}



      I'm invoking this beans methods from form:



      <h:commandButton value="Create process" action="#{startProcess.begin}"/>
<h:commandButton value="Begin" action="#{start.beginTask}"/>
<h:commandButton value="End" action="#{start.endTask}"/>



      When i click on Create process button everything looks ok, but when i try to begin task using Begin button, I see the debug page with message:



      Exception during request processing:
Caused by javax.servlet.ServletException with message: "#{start.beginTask}: javax.ejb.EJBTransactionRolledbackException: task/process id may not be null"



      Server logs looks ok, jbpm configuration also...


      Could anyone tell me, what is wrong?


      Thanks and regards!


      Jakub Naruszewicz