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The "FAQ/Class_Not_Found" page has been changed by KonstantinKolinko:
http://wiki.apache.org/tomcat/FAQ/Class_Not_Found?action=diff&rev1=13&rev2=14

Comment:
Correct file names. 

  
  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:  
[[http://tomcat.apache.org/tomcat-7.0-doc/class-loader-howto.html|Tomcat 7.0]], 
[[http://tomcat.apache.org/tomcat-6.0-doc/class-loader-howto.html|Tomcat 6.0]], 
[[http://tomcat.apache.org/tomcat-5.5-doc/class-loader-howto.html|Tomcat 5.5]].
+   * Classloader HOWTO pages:  
[[http://tomcat.apache.org/tomcat-7.0-doc/class-loader-howto.html|Tomcat 7.0]], 
[[http://tomcat.apache.org/tomcat-6.0-doc/class-loader-howto.html|Tomcat 6.0]].
    * [[http://marc.info/?t=104317529200004&r=1&w=2|Don't]] 
[[http://marc.info/?t=104380440100003&r=1&w=2|use]] 
[[http://marc.info/?t=96947656900002&r=1&w=2|packageless]] 
[[http://marc.info/?t=104491020100002&r=1&w=2|classes]] 
[[http://marc.info/?t=104265576200003&r=1&w=2|and]] 
[[http://marc.info/?t=104249748300001&r=1&w=2|declare]] 
[[http://marc.info/?t=102996950100003&r=1&w=2|all]] 
[[http://marc.info/?t=102922189400001&r=1&w=2|imported classes]]!
    * [[http://marc.info/?l=tomcat-user&m=103843452413727&w=2|Another answer to 
a classloader issue]]
  
@@ -28, +28 @@

  
  <<Anchor(Q2)>>'''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.
+ You probably have servlet-api.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-api.jar should only 
be found only once in $CATALINA_HOME/lib.
  
  <<Anchor(Q3)>>'''Why do I get {{{ java.lang.NoClassDefFoundError: 
org/xml/sax/InputSource }}}?'''
  

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