Take action before destory

Question

Hello, I am so confused with my current problem. Actually, I need to tackle some attributes in session just before destory.
However, using HttpSessionListener is not OK, as its destory action is called after destory. Choosing HttpSessionAttributeListener is also not a good idea, as this listener may invoke many many time when any attributes are added or replaced. Any suggestions.

Answer 1

I attach the HttpSessionListener to the object type itself that I store in the session. That way, when the session is invalidated, the object instance that is being tossed can handle any cleanup of its instance fields.
Here is how I handle it. You can always just implement HttpSessionListener on each object if you already have a parent class. This implementation works fine in WebSphere4.0, so I can only assume that it would work elsewere.
public abstract class Saveable implements HttpSessionListener
   public void valueBound(..){}
   public void valueUnBound(...)
       save();
   public abstract void save();
}