Secure two separate java applications with one spring security

I have been looking for quite awhile for solution to have one spring security for 2 or more applications.

Basically i have main app("/") running on tomcat, where user can interact with it etc, and second one, in separate context("/player"). I want to use one spring security to secure both app. So when user will login to main app("/") will be also able to access another context.

This is a point where i stuck.

If anyone have any ideas how to set it up i will be more then great.