code: private void invalidSurrogate(int uuuuu) throws UTFDataFormatException {
          
          String msg = JspCoreException.getMsg("jsp.error.xml.invalidHighSurrogate", new Object[] {Integer.toHexString(uuuuu)});
          throw new UTFDataFormatException(msg);
      }
docs: Throws an exception for invalid surrogate bits.