Spring DispatcherServlet is mapped to "/" to provide REST URLs in the application, but this interferes with default static resource serving:

<servlet>
<servlet-name>chat</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
<servlet-name>chat</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

It is possible to map *.jpg, *.css to the Servlet named "default", but this is only provided by Tomcat.

A portable method should use Spring dispatch.

Implementation verified on both Tomcat and GlassFish v3.

Current code contains:

InputStream fileStream = session.getServletContext().getResourceAsStream(filePath);

which causes the creation of a session just for serving resources. This should be optimized
by implementing ServletContextAware and obtaining the ServletContext without the HttpSession reference.

(Even better would be to add getServletContext() to ServletRequest.)