output: #fixed code
                                  @Override
      protected Optional<Instant> dataStamp() {
          // the URL may not be an HTTP URL
          try {
              URLConnection urlConnection = url.openConnection();
              if (urlConnection instanceof HttpURLConnection) {
                  HttpURLConnection connection = (HttpURLConnection) urlConnection;
                  try {
                      connection.setRequestMethod(HEAD_METHOD);
  
                      if (connection.getLastModified() != 0) {
                          return Optional.of(Instant.ofEpochMilli(connection.getLastModified()));
                      }
                  } finally {
                      connection.disconnect();
                  }
              }
          } catch (IOException ex) {
              LOGGER.log(Level.FINE, ex, () -> "Configuration at url '" + url + "' HEAD is not accessible.");
          }
  
          Optional<Instant> timestamp = Optional.of(Instant.MAX);
          LOGGER.finer("Missing HEAD '" + url + "' response header 'Last-Modified'. Used time '"
                               + timestamp + "' as a content timestamp.");
          return timestamp;
      }
input: #vulnerable code 
                                  @Override
      protected Optional<Instant> dataStamp() {
          try {
              HttpURLConnection connection = (HttpURLConnection) url.openConnection();
              connection.setRequestMethod(HEAD_METHOD);
  
              if (connection.getLastModified() != 0) {
                  return Optional.of(Instant.ofEpochMilli(connection.getLastModified()));
              }
          } catch (IOException ex) {
              LOGGER.log(Level.FINE, ex, () -> "Configuration at url '" + url + "' HEAD is not accessible.");
          }
          Optional<Instant> timestamp = Optional.of(Instant.MAX);
          LOGGER.finer("Missing HEAD '" + url + "' response header 'Last-Modified'. Used time '"
                               + timestamp + "' as a content timestamp.");
          return timestamp;
      } 
                              #location 7 
                              #vulnerability type RESOURCE_LEAK