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How to run two sessions in same domains using Servlet

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I have two totally different modules e.g. user and employees.
When I login to employees the user module and if I login to user module by logging out the employees then employee module throwing the following error:

These two modules or on the same domain e.g.

Why when one module logins then other throwing NPE?
How can I run two different sessions on same domain?

Best Regards

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