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session becomes null after few seconds

 
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Session object becomes null on applications deployed on WAS 6 server
after 20-30 secs. What can be the reason. Kindly help me regarding this.
 
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Possibilities that occur to me:
1. Some program is setting the session timeout very low. (pretty unlikely but possible)
2. The session contains a reference to an object that is not serializable, the servlet container is attempting to serialize the session as part of normal upkeep, when it cant be serialized, the container is invalidating the session. (look for error reports in logs)
Bill
 
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Some more possibilities other than what William said,

1. Check web applications deployment descriptor whether any <session-timeout> is given are not.

2. Check any default value set in Administrative Console for WAS.
 
vivek alva
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Thanks Guys for your reply. I am looking into the suggestions you have given
 
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