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From "A. Rothman" <>
Subject Re: Occasional NoClassDefFoundError, but disappears after couple of restarts
Date Mon, 02 Nov 2009 10:40:36 GMT
To anyone who may stumble upon this thread looking for solutions - this 
bug has been investigated and fixed by Konstantin Kolinko 
( The fix 
should be available in Tomcat 6.0.21 and later. 

A. Rothman wrote:

> I've opened 
> with a sample jsp that recreates the error.
> Mark Thomas wrote:
>> A. Rothman wrote:
>>> A couple months ago I had a slightly different setting but with the 
>>> same
>>> strange result - NoClassDefFoundErrors which occurred on a particular
>>> jsp page in my app, but only if it was the first jsp accessed following
>>> a restart (and remained in the error state until the next restart). If
>>> it was not the first jsp accessed, then everything came up fine (with
>>> nothing in the configuration or app changing in between). I also 
>>> figured
>>> it's some classloader bug in Tomcat, not entirely a race condition
>>> (since it did happen consistently), but something that manifests itself
>>> depending on the order of class loading.
>> If you can provide a cut-down copy of that JSP that reproduces the
>> problem on a clean Tomcat install, I'd be happy to take a look. Just
>> create a new bugzilla entry and provide the JSP as an attachment.
>> Mark
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