Hi Ceki and all, I figured the problem out so there's no need to answer my previous email. FYI: What was missing is the CallerData object that apparently needs to be defined.... Here is the code: (in addition to the code in previous message) CallerData callerData= new CallerData("somefilename.java", "foo", "methodFoo", 123); CallerData[] cda = new CallerData[1]; cda[0] = callerData; //then I added the callerData to the event... event.setCallerInformation(cda); This did the trick. I'm happy ;-) Gregory