[jboss-user] [JBoss Seam] - How to use org.jboss.seam.core.TaskInstance?

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I created a simple task manager which allows to start, end tasks and retrieve task's variables

import org.jboss.seam.core.TaskInstance;

@Stateful
@Name("taskManager")
@Scope(ScopeType.CONVERSATION)
public class TaskManagerImpl implements TaskManager {

  @In(required=false)
  private Long taskId;
  @DataModel
  private List transitions;
  @DataModelSelection("transitions")
  private Transition selectedTransition;
  @DataModel
  private List taskFormParameters;
  @DataModelSelection("taskFormParameters")
  private TaskFormParameter taskFormParameter;
	
  @BeginTask
  public String startTask() {

     org.jbpm.taskmgmt.exe.TaskInstance taskInstance = TaskInstance.instance();
     if(taskInstance != null) {
			
           this.transitions = taskInstance.getAvailableTransitions();
           this.comments = taskInstance.getComments();
			
           taskFormParameters = new ArrayList();
           TaskController taskController = taskInstance.getTask().getTaskController();
           if (taskController!=null) {
                  for(Object va : taskController.getVariableAccesses()) {
		    	  
                         VariableAccess variableAccess = (VariableAccess) va;
                         String mappedName = variableAccess.getMappedName();
                         String value = (String)taskInstance.getVariable(mappedName);
                         TaskFormParameter tfp = new TaskFormParameter(variableAccess, value);
                         System.out.println("reading [" + tfp.getLabel() + "]=" + tfp.getValue() + " readable " + tfp.isReadable() + " writable " + tfp.isWritable());
                         taskFormParameters.add(tfp);
                   }
             }
			
         }
         return "/task.xhtml";
		
     } 

   @EndTask
   public String  endTask() {

         org.jbpm.taskmgmt.exe.TaskInstance taskInstance = TaskInstance.instance();
         BusinessProcess.instance().transition(selectedTransition.getName());
		
         for(TaskFormParameter tfp : this.taskFormParameters){
             if (tfp.isWritable()) {
				
                  System.out.println("isOpen " + taskInstance.isOpen());
                  System.out.println("submitting [" + tfp.getLabel() + "]=" + tfp.getValue() + " readable " + tfp.isReadable() + " writable " + tfp.isWritable());
                  taskInstance.setVariable(tfp.getLabel(), tfp.getValue());
                  System.out.println("test " + taskInstance.getVariable(tfp.getLabel()));
				
              } else {
		    	
                 System.out.println("ignoring unwritable [" + tfp.getLabel() + "]");
		    	
            }

        }
		
       return "/available.xhtml";
		
    }
	
   @End
   public String cancelTask() {
		
           return "/available.xhtml";
		
   }
	
	
   @Remove @Destroy
   public void remove() {
				
   }

}

then i defined a simple workflow 

<?xml version="1.0"?>

<process-definition name="sampleflow">
    <start-state name="start">
        < task name="start">
           <assignment pooled-actors="debuggers"/>
        </ task>
        
     </start-state>
	
    <task-node name="sample">
        < task name="sample" description="sample description">
           <assignment pooled-actors="debuggers"/>
           
                <variable name="readableVar" mapped-name="readableVar" access="read,write"/>
                <variable name="writableVar" mapped-name="writableVar" access="read,write"/>
          
        </ task>
        
        
   </task-node>
   <task-node name="task1">
        < task name="another sample task" description="sample description">
            <assignment pooled-actors="debuggers"/>
            
                  <variable name="readableVar" access="read" mapped-name="readableVar"/>
                  <variable name="writableVar" access="read" mapped-name="writableVar"/>
            
        </ task>
        
   </task-node>

    <end-state name="end"/>
	
</process-definition>

The trouble is that not null variables in task named sample, become null in task named another sample task






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