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copied!<p><strong>According to Oracle:</strong></p> <blockquote> <p><code>NoClassDefFoundError</code> is thrown if the Java Virtual Machine or a ClassLoader instance tries to load in the definition of a class (as part of a normal method call or as part of creating a new instance using the new expression) and no definition of the class could be found.</p> </blockquote> <p>In simple language, it means "At compile-time <code>class</code> was there but at run-time, it failed to find/load the <code>class</code><br/><br/> <strong>Question comes : How come my code compile?</strong></p> <p>Answer maybe because you added <code>jars</code> using Eclipse. But Eclipse does not actually move those <code>jars</code> into you <code>classpath</code>.It just uses those referenced <code>jars</code> while compilation. So your code compiles fine. <br/> After, you move your project to tomcat, when it tries to load some class inside those 'jars', it fails to find the <code>class</code>,because you never moved those <code>jars</code> to the classpath.<br/><br/> <strong>Solution:</strong><br/> Move all the <code>libraries(jars)</code> into your project's <code>/WEB-INF/lib</code>. Now all the <code>libraries/jars</code> under <code>/WEB-INF/lib</code> will come under <code>classpath</code>. </p> <p>You can read more on <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/NoClassDefFoundError.html" rel="nofollow">Oracle's Docs</a> & <a href="http://javarevisited.blogspot.in/2011/06/noclassdeffounderror-exception-in.html" rel="nofollow">this article</a></p>

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