code: private void parseSpecs(URL url) throws MalformedURLException {
          String spec = url.getFile();
  
          int separator = spec.indexOf("!/");
          /*
           * REMIND: we don't handle nested JAR URLs
           */
          if (separator == -1) {
              throw new MalformedURLException("no !/ found in url spec:" + spec);
          }
  
          jarFileURL = new URL(spec.substring(0, separator++));
          entryName = null;
  
          /* if ! is the last letter of the innerURL, entryName is null */
          if (++separator != spec.length()) {
              entryName = spec.substring(separator, spec.length());
              entryName = ParseUtil.decode (entryName);
          }
      }
docs: /* get the specs for a given url out of the cache, and compute and
  cache them if they're not there.