code: protected void doCommonFilter(PortletRequest request, PortletResponse response, FilterChain chain) throws IOException, PortletException {
          PortletFilterUtils.doFilter(request, response, chain);
      }
docs: Can be implemented by subclasses to provide filter handling common to all request types. Default
  implementation just uses {@link org.jasig.springframework.web.portlet.filter.PortletFilterUtils#doFilter(PortletRequest, PortletResponse, FilterChain)}
  
  @param request a {@link javax.portlet.PortletRequest} object.
  @param response a {@link javax.portlet.PortletResponse} object.
  @param chain a {@link javax.portlet.filter.FilterChain} object.
  @throws java.io.IOException if any.
  @throws javax.portlet.PortletException if any.