How to effectively destroy 'session' in Java Servlet?

The Servlet I'm working has a variable session.

I've tried session.invalidate();, this seem to have destroyed session but when I do a redirect like so response.sendRedirect("restanes.jsp");, it gives me HTTP Status 500 error with this line:

java.lang.IllegalStateException: getAttribute: Session already invalidated

This is expected since I was trying to destroy the session.

But why is the page unable to redirect? On the same page elsewhere I've redirected successfully.

How can I destroy session and redirect successfully?

Code snippet:

if(request.getParameter("logout") != null ){          session.invalidate();        response.sendRedirect("restanes.jsp");}

Update:All I needed to do was return; after response.sendRedirect("restanes.jsp");. Sincere thanks to BalusC.