How to write a date controller for jmeter 1.9.1 ?

[frank sander]

Hello friends,

I'm new in JMeter and struggle with some problems. I want to write a 
controller which executes Samples only at service times (e.g. 7 am to 7 pm). 
I want to have a continous test, so there will be no termination of the test 
at all.

I did following:
I wrote a JMeterTimeController class inherited from GenericController and a 
JMeterTimeControllerGui inherited from AbstractControllerGui.

My understanding is, that the Sample, I want to test, is nested inside this 
Controller.
I implemented the "public Sample next()" method, which returns the Sample at 
service time and returns null, if not (e.g. at 12 am).

Code is following:
   public Sampler next() {
                Date date = new Date(System.currentTimeMillis());
                Sampler currentElement = super.next();
                if (date.getHours()>6 || date.getHours()<20 ) {
                        return currentElement;
                } else {
                        return null;
                }
   }
setDone(true) isn't called, because I don't want the Test stopped.
I saw similar code in IfController.java and I wonder, why I get allways a 
"StackOverflow" Exception.

The tree in the Gui is following:

TestPlan
+-Thread
  +-Time Controller (the one I wrote)
     +-Sample
     +-Config
     +-Constant Throughput Timer
What did I miss ?

Thank you for your help and suggestions,

Greetings,

Frank

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