How to catch thrown error when implementing HttpSessionBindingListener?

Question

I would like to write code to implement the class HttpSessionBindingListener for using the valueBound and valueUnBound method.
As I have put some codes for inserting data in database when the valueBound method is invoked, I would like to catch the SQLException error when insertion fails. However, when i try the following:
public class SessionTracker implements HttpSessionBindingListener
throws Exception{
Compilation error like the following appears:
Class SessionTracker should be declared abstract; it does not define method valueUnbound(javax.servlet.http.HttpSessionBindingEvent) in interface javax.servlet.http.HttpSessionBindingListener
My question is: How can I throw caught error?
Thanks for replying!

Answer 1

May be i should clarify a little bit?
My question is: What error would the implemented method throw?