code: @Override
  	public void registerServlet(final String alias, final Servlet servlet,
  								@SuppressWarnings("rawtypes") final Dictionary initParams,
  								final HttpContext httpContext) throws ServletException,
  			NamespaceException {
  		synchronized (lock) {
  			this.registerServlet(alias, servlet, initParams, null, null,
  					httpContext);
  		}
  	}
docs: From Http Service - cannot fix generics until underlying Http Service is
  corrected