How to retrieve the human task result mapping and parameter mapping

[odelyaholiday]

I defined human task with result mapping and parameters mapping.

so:

result mapping has value requestData=requestData

and parameter mapping has value requestData=requestDat

I start the process like this.

Map<String, Object> parameters = new HashMap<String, Object>();
  parameters.put("requestData", prgoramData);


  //ksession.getWorkItemManager().registerWorkItemHandler("Human Task", new WSHumanTaskHandler());

  ProcessInstance pi = ksession.startProcess("com.mycompany.ProgramAcquisition", parameters);

in the task list, I get the user task like this:

taskClient.getTasksAssignedAsPotentialOwner(userName, "en-UK", handler);
tasks = handler.getResults();

how can I retrieve the parameter mapping request data from the human task?