jsp - Users at a time should login from one place only in java -

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i want suppose if user logged website 1 location , @ same time user tries login location/computer should display "user logged in already" or should give error.. not asking code please dont close question. have searched alot posting question .
please give me links or ideas can implement in project. have made website in java struts2.

spring security has this, take @ http://docs.spring.io/spring-security/site/docs/3.1.x/reference/session-mgmt.html#concurrent-sessions

you can either use spring security (which means redoing auth stuff) or @ classes concurrency , implement similar.


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