Program: 91939
Project: 91939
Buggy source:
/** 
 * Parses the   {@code ID["authority", "code"]} element inside a {@code UNIT} element.If such element is found, the authority is  {@code "EPSG"} and the code is one ofthe codes known to the  {@link Units#valueOfEPSG(int)}, then that unit is returned. Otherwise this method returns null. <div class="note"><b>Note:</b> this method is a slight departure of ISO 19162, which said <cite>"Should any attributes or values given in the cited identifier be in conflict with attributes or values given explicitly in the WKT description, the WKT values shall prevail."</cite> But some units can hardly be expressed by the   {@code UNIT} element,because the later can contain only a conversion factor. For example sexagesimal units (EPSG:9108, 9110 and 9111) can hardly be expressed in an other way than by their EPSG code. Thankfully, identifiers in {@code UNIT} elements are rare, so risk of conflicts should be low.</div>
 * @param parent The parent {@code "UNIT"} element.
 * @return The unit from the identifier code, or {@code null} if none.
 * @throws ParseException if the {@code "ID"} can not be parsed.
 */
final Unit<?> parseUnitID(final Element parent) throws ParseException {
  final Element element=parent.pullElement(OPTIONAL,ID_KEYWORDS);
  if (element != null) {
    final String codeSpace=element.pullString("String_Node_Str");
    final Object code=element.pullObject("String_Node_Str");
    element.close(ignoredElements);
    if (Constants.EPSG.equalsIgnoreCase(codeSpace))     try {
      final int n;
      if (Numbers.isInteger(code.getClass())) {
        n=((Number)code).intValue();
      }
 else {
        n=Integer.parseInt(code.toString());
      }
      return Units.valueOfEPSG(n);
    }
 catch (    NumberFormatException e) {
      warning(parent,element,e);
    }
  }
  return null;
}

Fixed version (ground truth):
/** 
 * Parses the   {@code ID["authority", "code"]} element inside a {@code UNIT} element.If such element is found, the authority is  {@code "EPSG"} and the code is one ofthe codes known to the  {@link Units#valueOfEPSG(int)}, then that unit is returned. Otherwise this method returns null. <div class="note"><b>Note:</b> this method is a slight departure of ISO 19162, which said <cite>"Should any attributes or values given in the cited identifier be in conflict with attributes or values given explicitly in the WKT description, the WKT values shall prevail."</cite> But some units can hardly be expressed by the   {@code UNIT} element,because the later can contain only a conversion factor. For example sexagesimal units (EPSG:9108, 9110 and 9111) can hardly be expressed in an other way than by their EPSG code. Thankfully, identifiers in {@code UNIT} elements are rare, so risk of conflicts should be low.</div>
 * @param parent The parent {@code "UNIT"} element.
 * @return The unit from the identifier code, or {@code null} if none.
 * @throws ParseException if the {@code "ID"} can not be parsed.
 */
final Unit<?> parseUnitID(final Element parent) throws ParseException {
  final Element element=parent.pullElement(OPTIONAL,ID_KEYWORDS);
  if (element != null) {
    final String codeSpace=element.pullString("String_Node_Str");
    final Object code=element.pullObject("String_Node_Str");
    element.close(ignoredElements);
    if (Constants.EPSG.equalsIgnoreCase(codeSpace))     try {
      final int n;
      if (Numbers.isInteger(code.getClass())) {
        n=((Number)code).intValue();
      }
 else {
        n=Integer.parseInt(code.toString());
      }
      return Units.valueOfEPSG(n);
    }
 catch (    NumberFormatException e) {
      warning(parent,element,null,e);
    }
  }
  return null;
}