JSF Multiple Session Issue

Read this article

http://www.coderanch.com/t/537817/JSF/java/JSF-Session-scope-managed-beans

To sum up:

For JSF 1.x
Use 'Spring' or 'Orchestra Library'
Orchestra >> http://myfaces.apache.org/orchestra/index.html

For JSF 2.0
Use in built 'View Scope'