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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:

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

Anchor
Q1
Q1
*Why is

No Format
 jsp:useBean 

...

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

    No Format
     com.bar.package.MyClass 

    ) OR

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

    No Format
     <%@ page import="com.bar.package.MyClass"%> 

    )

Anchor
Q2
Q2
*Why do I get

No Format
 java.lang.NoClassDefFoundError: javax/servlet/Filter

...

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

CategoryFAQ