This Confluence has been LDAP enabled, if you are an ASF Committer, please use your LDAP Credentials to login. Any problems file an INFRA jira ticket please.

Page tree
Skip to end of metadata
Go to start of metadata

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:

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

Questions

  1. Why is jsp:useBean is not working?
  2. Why do I get java.lang.NoClassDefFoundError: javax/servlet/Filter?
  3. Why do I get java.lang.NoClassDefFoundError: org/xml/sax/InputSource?

Answers

*Why is

 jsp:useBean 

is not working?*

Make sure:

  • Your bean is packaged in a class.
  • You have fully qualified your class name (e.g.:

     com.bar.package.MyClass 

    ) OR

  • You have imported your class into your jsp (e.g.:

     <%@ page import="com.bar.package.MyClass"%> 

    )

*Why do I get

 java.lang.NoClassDefFoundError: javax/servlet/Filter

?*

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.

*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.



  • No labels