1. To handle 404 not found yourself, just add this code to your web.xml
<error-page>
<error-code>404</error-code>
<location>/pageNotFound.jsp</location>
</error-page>
2. To handle wrong action not mapped in Struts2, just add this code to struts.xml
<package name="serveAll" namespace="" extends="struts-default">
<action name="*">
<result>/pageNotFound.jsp</result>
</action>
</package>