Invoke Info engine task from java code

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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;  }