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Concurrent HTTP Session is returning wrong user

Posted on 2013-05-14
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Last Modified: 2013-05-26
I am experiencing a quite weird problem. When two users are logging at the exact same time, one of them is detected as the other.


        locale = new Locale(getLocale(request).getLanguage(), getLocale(request).getCountry());
        
	
        strRemoteUser = WebTools.getUserIdWithoutDomainName(request.getRemoteUser()).toUpperCase();
    	
    	logger.info("[MYAPP] User " + strRemoteUser + " is logging in");

    	logger.info("[MYAPP] Creating session for : " + strRemoteUser);
    	
        HttpSession session = request.getSession(false);

        if (session != null) {
		
            session.invalidate();
            session = request.getSession();
        }       

        logger.info("[MYAPP] User in session is : " + strRemoteUser);    	      

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What I get is the following. Let's assume that two users (USR001 and USR002) are logging to the application at the same exact time. They are located in a different location.

Logs:

		2013-05-14 08:19:38,550 INFO  [com.myapp.action.common.LoginAction] [MYAPP] User USR001 is logging in
	2013-05-14 08:19:38,551 INFO  [com.myapp.action.common.LoginAction] [MYAPP] Creating session for : USR001
	2013-05-14 08:19:38,760 INFO  [com.myapp.action.common.LoginAction] [MYAPP] User USR002 is logging in
	2013-05-14 08:19:38,761 INFO  [com.myapp.action.common.LoginAction] [MYAPP] Creating session for : USR002
	2013-05-14 08:19:38,834 INFO  [com.myapp.action.common.LoginAction] [MYAPP] User in session is : USR002
	2013-05-14 08:19:39,104 INFO  [com.myapp.action.common.LoginAction] [MYAPP] User in session is : USR002
	2013-05-14 08:19:39,425 INFO  [com.myapp.action.common.LoginAction] [MYAPP] Auto Added User USR002
	2013-05-14 08:19:39,550 INFO  [com.myapp.action.common.LoginAction] [MYAPP] Setting user in session: USR002 (673)

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As you can see, USR002 "wins" the concurrent session creation as USR001 is now recognized as USR002. If USR001 logs out and then log back in, it works properly.

Any thoughts/advice?

Thank you very much for help.

Specs:

* jBoss 4.2.3GA
* PostgreSQL 9.0.3
* Struts 1.3.5
* EJB3
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Question by:SolutionsTI
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Expert Comment

by:krakatoa
ID: 39165795
And is it the same weird problem that you posted over on Stackoverflow?
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Accepted Solution

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SolutionsTI earned 0 total points
ID: 39184035
Yes. Same problem.

The problem was in fact that the strRemoteUser was defined as a Class Variable for my LoginAction Struts action class.

This action is used by any user attempting to log in to the system. One gentleman on stackoverflow told my that Class Variables are common concurrent problem so I gave it a try.

Instead of a class variable I kept the strRemoteUser as a variable, and then pass it to all methods where I needed it.

It worked! The day after I had more than 80 people login in at the same time. The problem is now solved permanently.

Thank you
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Author Closing Comment

by:SolutionsTI
ID: 39197417
I have found the solution on another site. The solution has been shared on Experts-Exchange.

Thank you
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