public Collection<String> getServletNameMappings() {
   FilterMapping[] mappings = _servletHandler.getFilterMappings();
   List<String> names = new ArrayList<String>();
   for (FilterMapping mapping : mappings) {
     if (mapping.getFilterHolder() != FilterHolder.this) continue;
     String[] servlets = mapping.getServletNames();
     if (servlets != null && servlets.length > 0) names.addAll(Arrays.asList(servlets));
   }
   return names;
 }