What's the difference between session.setAttribute and request.setAttribute?

Question

What's the difference between session.setAttribute and request.setAttribute?

Answer 1

The scope, session attribute live all the session and the request attribute only in a request

Answer 2

Difference lies in the scope. Request-scoped attribute is visible only while current request is processed. Session attribute is persistent between several requests from the same user. Session support mechanisms may differ (the most widespread are cookie based), but all of them guarantee session attrigbute persistence until user's session stays the same.