problem in customizing graph (poll data)in adventnet

I did some change in getInstancesForPD() of SnmpCurrentGraphController.java () for getting some change in currentgraph of poll data in case of performance management.but i am not getting any change in my standalone client application(webnms).

I did everything like compile JFreechart from bean builder,put new performancegraph.jar with modified classes in /netmonitor/build/ ,put this performancegraph.jar in startApplicationClient.bat but i m unable to see atleast "hi,hello" printed from this java file.

Version/Platform details:
WebNMS version WebNMS 5 Professional Edition
OS Windows XP

can anybody help me to solve this

Regards

Biswajit