Absolute path used in contacts.jsp of resteasy-springMVC example:

Line 15 of contacts.jsp: <form action="/contacts" method="post">

This will make the example always post request to top level uri: http://<hostname>/contacts

But when the example is deployed in application, such as JBoss, it will serve at relative path: http://<hostname>/resteasy-springMVC/contacts.

Which will cost a 404 error.

Remove the slash in form action will eliminate the problem: <form action="contacts" method="post">