code: public SAXParseException getSAXParseException() {
          SAXParseException ex = null;
          Throwable linkedException = this.getLinkedException();
          if (linkedException instanceof javax.xml.bind.UnmarshalException) {
              UnmarshalException ue = (UnmarshalException) linkedException;
              linkedException = ue.getLinkedException();
              if (linkedException instanceof org.xml.sax.SAXParseException) {
                  ex = (SAXParseException) linkedException;
              }
          }
          return ex;
      }
docs: <p>
  return SAXParseException.<br>
  return null if exception has not link to SAXParseException.
  </p>
  @return