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From "Schnitzer, Jeff" <>
Subject JSTL expression evaluation fails under load
Date Thu, 23 Jan 2003 23:52:29 GMT
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I'm getting erratic behavior from JSTL tags under Tomcat 4.1.12.  When
under load, sometimes expressions fail to evaluate.  This exception is

javax.servlet.ServletException: javax.servlet.jsp.JspException: An error
occurred while evaluating custom action attribute "test" with value
"${threadTool.player.moderator}": An error occurred while getting
property "player" from an instance of class (java.lang.NullPointerException)
        at javax.servlet.http.HttpServlet.service(

It results in the page half-loading.  Simply refreshing the page works.
The expression is valid!  There is a

I don't believe this behavior occurred under Tomcat 4.0.6.

Unfortunately I can't seem to get any of the deeper exceptions - that's
as deep as the stack trace reports.

Does anyone have any idea what might be wrong, or how to go about
diagnosing the error?

Thanks in advance,
Jeff Schnitzer
The Sims Online

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