Servlets and JSPs. A simple request?
request.getRequestDispatcher("/WEB-INF/content" + request.getPathInfo()).forward(request, response);

<filter>
    <filter-name>ProcessFilter</filter-name>
    <filter-class>my.filter.ProcessFilter</filter-class>
</filter>

<!-- Map all ".jsp" that should go through the filter-->
<filter-mapping>
    <filter-name>ProcessFilter</filter-name>
    <url-pattern>/content/*.jsp</url-pattern>
</filter-mapping>

<!-- If you have Any servlets that needs to go through ProcessFilter -->
<filter-mapping>
    <filter-name>ProcessFilter</filter-name>
    <servlet-name>MyServlet</servlet-name>
</filter-mapping>

public class ProcessFilter extends Filter {

public final void doFilter(ServletRequest request, ServletResponse response,
           FilterChain filterChain)
        throws ServletException, IOException {

    if (!(request instanceof HttpServletRequest) ||
                !(response instanceof HttpServletResponse)) {
        throw new ServletException("OncePerRequestFilter just supports HTTP requests");
    }
    HttpServletRequest httpRequest = (HttpServletRequest) request;
    HttpServletResponse httpResponse = (HttpServletResponse) response;

    String alreadyFilteredAttributeName = "ALREADY_PROCESSED_BY_PROCESS_FILTER";
    if (request.getAttribute(alreadyFilteredAttributeName) != null) {
        // Proceed without invoking this filter...
        filterChain.doFilter(request, response);
    }
    else {
        // Do invoke this filter...
        request.setAttribute(alreadyFilteredAttributeName, Boolean.TRUE);
        try {
            doFilterInternal(httpRequest, httpResponse, filterChain);
        }
        finally {
            // Remove the "already filtered" request attribute for this request.
            request.removeAttribute(alreadyFilteredAttributeName);
        }
    }
}

    protected void doFilterInternal(
        HttpServletRequest request, HttpServletResponse response,
                    FilterChain filterChain) {
        throws ServletException, IOException
                            /*
                             *
                             *
                             *  Put your processing logic here
                             *
                             *
                             */
    }

}