Invoke Info engine task from java code

private String taskName = "task.xml"; //Info engine task to be executed.
private IeCollection invokeQueryTask( String taskName, String className) 
 throws WTException, IEException, IOException

 {
  IeCollection iecollection = new IeCollection();
  Task task = new Task();

  task.setTaskURI(taskName);
  task.addParam("className", className);
//Invoke a task
  task.invoke();
  iecollection = task.getVDB();
//return the task results as info engine collection
  return iecollection;
 }