How to catch a HTTP 404 in Java

I have a web application and I have a problem If the web page does not exist in my application I have got the following error page

HTTP Status 404 - /myapplication/department/home.html

type Status report

message /myapplication/department/home.html

d开发者_JS百科escription The requested resource (/myapplication/department/home.html) is not available.

I want to forward user to the index page, if this problem happen , without he knows How to do that

Just specify the index page as 404 default error page in web.xml.

<error-page>
    <error-code>404</error-code>
    <location>/index.jsp</location>
</error-page>

I assume that you are aware that this is bad for user experience and SEO? If it is for example a page which you have (re)moved, then you should rather create a filter which does a 301 redirect to the desired location.