Program: 156097
Project: 156097
Buggy source:
@Override protected Object decode(Channel channel,SocketAddress remoteAddress,Object msg) throws Exception {
  String sentence=(String)msg;
  if (sentence.startsWith("String_Node_Str")) {
    if (!identify(sentence.substring(14,14 + 15),channel)) {
      return null;
    }
    if (channel != null) {
      channel.write("String_Node_Str" + sentence.substring(13) + "String_Node_Str");
    }
  }
 else   if (sentence.startsWith("String_Node_Str")) {
  }
 else   if (hasDeviceId()) {
    Matcher parser=PATTERN.matcher(sentence);
    if (!parser.matches()) {
      return null;
    }
    Position position=new Position();
    position.setProtocol(getProtocolName());
    position.setDeviceId(getDeviceId());
    Integer index=1;
    Calendar time=Calendar.getInstance(TimeZone.getTimeZone("String_Node_Str"));
    time.clear();
    time.set(Calendar.HOUR_OF_DAY,Integer.parseInt(parser.group(index++)));
    time.set(Calendar.MINUTE,Integer.parseInt(parser.group(index++)));
    time.set(Calendar.SECOND,Integer.parseInt(parser.group(index++)));
    position.setValid(parser.group(index++).compareTo("String_Node_Str") == 0);
    Double latitude=Double.parseDouble(parser.group(index++));
    latitude+=Double.parseDouble(parser.group(index++)) / 60;
    if (parser.group(index++).compareTo("String_Node_Str") == 0)     latitude=-latitude;
    position.setLatitude(latitude);
    Double longitude=Double.parseDouble(parser.group(index++));
    longitude+=Double.parseDouble(parser.group(index++)) / 60;
    if (parser.group(index++).compareTo("String_Node_Str") == 0)     longitude=-longitude;
    position.setLongitude(longitude);
    position.setSpeed(Double.parseDouble(parser.group(index++)));
    time.set(Calendar.DAY_OF_MONTH,Integer.parseInt(parser.group(index++)));
    time.set(Calendar.MONTH,Integer.parseInt(parser.group(index++)) - 1);
    time.set(Calendar.YEAR,2000 + Integer.parseInt(parser.group(index++)));
    position.setTime(time.getTime());
    return position;
  }
  return null;
}

Fixed version (ground truth):
@Override protected Object decode(Channel channel,SocketAddress remoteAddress,Object msg) throws Exception {
  String sentence=(String)msg;
  if (sentence.startsWith("String_Node_Str")) {
    if (!identify(sentence.substring(14,14 + 15),channel)) {
      return null;
    }
    if (channel != null) {
      channel.write("String_Node_Str" + sentence.substring(13) + "String_Node_Str");
    }
  }
 else   if (hasDeviceId()) {
    Parser parser=new Parser(PATTERN,sentence);
    if (!parser.matches()) {
      return null;
    }
    Position position=new Position();
    position.setProtocol(getProtocolName());
    position.setDeviceId(getDeviceId());
    DateBuilder dateBuilder=new DateBuilder().setTime(parser.nextInt(),parser.nextInt(),parser.nextInt());
    position.setValid(parser.next().equals("String_Node_Str"));
    position.setLatitude(parser.nextCoordinate());
    position.setLongitude(parser.nextCoordinate());
    position.setSpeed(parser.nextDouble());
    dateBuilder.setDateReverse(parser.nextInt(),parser.nextInt(),parser.nextInt());
    position.setTime(dateBuilder.getDate());
    return position;
  }
  return null;
}