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From Apache Wiki <>
Subject [Tomcat Wiki] Update of "FAQ/Class Not Found" by GianlucaVarisco
Date Wed, 28 Nov 2007 16:30:15 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Tomcat Wiki" for change notification.

The following page has been changed by GianlucaVarisco:

The comment on the change is:
FAQ Migration - Issue 20 - GHOP Contest

New page:
== Class Not Found Issues ==

=== Preface ===

This page discusses the various ways you see Class Not Found errors or very similar errors.
It is strongly advised you read the following topics:

    * Classloader HOWTO pages:  [
Tomcat 4.1],  [ Tomcat 5.0],
 [ Tomcat 5.5].
    * [ Don't] [
use] [ packageless] [
classes] [ and] [
declare] [ all] [
imported classes]!
    * [ Another answer
to a classloader issue]

If you get a NoClassDefFoundError exception, the root cause might be the same as for a ClassNotFound

=== Questions ===

* '''Why is jsp:useBean is not working?'''

Make sure:

    * Your bean is packaged in a class.
    * You have fully qualified your class name ( OR
    * You have imported your class into your jsp (eg: <%@ pageimport=""%>)

* '''Why do I get java.lang.NoClassDefFoundError: javax/servlet/Filter?'''

You probably have servlet.jar floating around somewhere it shouldn't be. This really messes
up the classloaders since Tomcat's classloaders don't act quite as normal as one expects (see
links above). servlet.jar should only be found only once in $CATALINA_HOME/common/lib.

* '''Why do I get java.lang.NoClassDefFoundError: org/xml/sax/InputSource?'''

You have conflicting XML api jar files in your classpath. Read the README or RELEASE-NOTES
for more information. 

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