shashank bezalwar,
Welcome to JavaRanch!
In an effort to help you get the most from our forums, we've compiled a
list of tips for asking questions here. You can find the list in our
FAQ section
here.
In particular please see:
TellTheDetails.
Telling us that your application is throwing a NullPointerException but not posting the line of code where it's occurring or, at least, posting the stack trace (as you've already been asked to do) so that we can ask you what's on line xxx makes it virtually impossible for us to help you.
Put yourself in our shoes. How would you help someone who asks you what's wrong with a program if it's throwing a NullPointerException?
Try to give us as much relevant information as possible, including code snippets and stack traces.
-Ben