public void unregisterOverlapping() throws Exception {

		HttpService _httpSR = getContext().getServiceReference(HttpService.class.getName());
		ServiceReference _http = (HttpService) getContext().getService(_httpSR);

		HttpContext httpContext = new HttpContext() {
			public java.net.URL getResource(final String name) {
			    // Map a resource name to a URL.
			    return (URL) AccessController.doPrivileged(new PrivilegedAction() {
	                             public Object run() {
	                                  return getClass().getResource(name);
	                             }
			    });
			}
			public String getMimeType(String name) {
	             	    // Map a name to a MIME type.
		            return null;
			}
			public boolean handleSecurity(HttpServletRequest request,HttpServletResponse response)
				 throws java.io.IOException {
			    // Handle security for a request.
			    return true;
			}
		};

                HttpTestServlet1 servlet_aa = new HttpTestServlet1();
                HttpTestServlet2 servlet_aabb = new HttpTestServlet2();

                // register first servlet with path /aa
                _http.registerServlet("/aa", servlet_aa, null, httpContext);

                // register second servlet with overlapping path /aa/bb
                _http.registerServlet("/aa/bb", servlet_aabb, null, httpContext);

                // unregister servlet with path /aa/bb
                _http.unregister("/aa/bb");

        }