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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=3815 JspServlets produces NullPointerException [EMAIL PROTECTED] changed: What |Removed |Added ---------------------------------------------------------------------------- Status|RESOLVED |REOPENED Resolution|INVALID | ------- Additional Comments From [EMAIL PROTECTED] 2003-02-07 20:04 ------- During some load testing I have done, I have observed a similar exception. I'm not sure that this bug has anything to do with errors in user code, otherwise we would see user code in the stack trace, no ? More likely, this is related to bug 14077 "JSP class corruption when compiling page on SMP server", as I have encountered this problem on an SMP system. My environment included Tomcat 4.0.4 Sun E420R with 4 CPUs Solaris 2.8 After doing some investigation of JspServlet.java, there are some very clear race conditions that can happen which cause all sorts of funky exceptions including the NPE originally filed, when Tomcat is loaded down heavily with multiple requests. I have created a patch that has eliminated the problem entirely for me. What it tries to do is prevent a single JSP from being loaded concurrently from multiple threads. Besides fixing this immediate problem, It also appears to alleviate the Jasper MT problems in bug 14077. I can now run Tomcat and heavily load it down with requests, touch all the JSPs to force them to recompile, and no errors occur. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
