passing session to another web application

Question

let say in tomcat application server we deployed 2 web applications , web application A, web application B. How to pro-grammatically sync session from web application A to web application B . In other words, as long as user login to web application A, he is already login to web application B. As well when he log out.

Answer 1

Is this about authenticating user only once with same username and password for multiple sites?

If so google Single Sign On. There are a number of frameworks out there for doing just that.

Answer 2

Use the single sign on valve.

Answer 3

You may check Sharing session data between contexts HOW-TO to see if it solves your problem.