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Thread Safe JSP/Servlets

Thread Safe JSP/Servlets

2003-12-29       - By Merrill Cornish

 Back
Reply:     1     2     3  

I understand how to write thread-safe software in general, but I suddenly
realized that I don't understand what, if anything, Tomcat "shares" among
different sessions (i.e., different users accessing the same JSP application)
and would therefore be thread sensitive.

For example, in my servlets, I have only constant class fields--no instance
fields.  All user-specific information is stored in session attributes that
exist only between user login and logout.  However, it finally dawned on me
that my JSP pages are quietly being turned into servlets behind my back (this
is despite my occassionally referencing the generated *_jsp files while
debugging), and those servlets DO have instance fields.

My specific question is whether Tomcat keeps the instance fields for JSP
servlets separate by session.  My more general request is for a pointer to
"best practices" documentation on how to keep JSPs and servlets thread safe.

Merrill Cornish

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