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Concurrent access problem

 
sachyav
Greenhorn
Posts: 3
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hi
Currently i'm working on Intranet Site which runs on
technologies like JSP,IBM Websphere 3.5 and database
MS-Sql.
Here main problem occurs when concurrently user
accesses same Module.Then Server sometimes throws
1. Null pointer Exception
2. Number Format Exception
3. ArrayIndex out of Exception

Note:
This problem Occurs only when user concurrently
accesses the same module.
When there is no concurrent user then All my modules
works fine.

please let me know the causes....
sachin V.

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Sachin Vesanekar
 
Matthew Phillips
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Please read http://www.javaranch.com/name.jsp and re-register with a name that conforms. We would like you to be able to continue to post here at JavaRanch.
 
William Brogden
Author and all-around good cowpoke
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Posts: 13055
6
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It is extremely likely that you have not been paying attention to the Thread safety requirements of coding servlets. Probably there are one or more instance or static variables in your servlet/JSP that are dynamically changed during a request. Tch Tch! Bad Show! Thou shalt not use instance or static variables, only local ("automatic") variables for data that is specific to a particular request.
Bill

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