Program: 156073
Project: 156073
Buggy source:
@Override protected Object decode(Channel channel,SocketAddress remoteAddress,Object msg) throws Exception {
  if (channel != null) {
    channel.write("String_Node_Str");
  }
  String sentence=(String)msg;
  Pattern pattern=sentence.startsWith("String_Node_Str") ? PATTERN_OLD : PATTERN;
  Parser parser=new Parser(pattern,(String)msg);
  if (!parser.matches()) {
    return null;
  }
  if (!identify(parser.next(),channel,remoteAddress)) {
    return null;
  }
  if (pattern == PATTERN_OLD) {
    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(Parser.CoordinateFormat.HEM_DEG));
    position.setLongitude(parser.nextCoordinate(Parser.CoordinateFormat.HEM_DEG));
    position.setSpeed(parser.nextDouble());
    position.setCourse(parser.nextDouble());
    position.set(Event.KEY_HDOP,parser.next());
    dateBuilder.setDateReverse(parser.nextInt(),parser.nextInt(),parser.nextInt());
    position.setTime(dateBuilder.getDate());
    return position;
  }
 else {
    Date time=null;
    if (parser.hasNext(6)) {
      DateBuilder dateBuilder=new DateBuilder().setTime(parser.nextInt(),parser.nextInt(),parser.nextInt()).setDateReverse(parser.nextInt(),parser.nextInt(),parser.nextInt());
      time=dateBuilder.getDate();
    }
    List<Position> positions=new LinkedList<>();
    Parser itemParser=new Parser(PATTERN_ITEM,parser.next());
    while (itemParser.find()) {
      positions.add(decodePosition(itemParser,time));
    }
    return positions;
  }
}

Fixed version (ground truth):
@Override protected Object decode(Channel channel,SocketAddress remoteAddress,Object msg) throws Exception {
  if (channel != null) {
    channel.write("String_Node_Str");
  }
  String sentence=(String)msg;
  Pattern pattern=PATTERN;
  if (sentence.startsWith("String_Node_Str")) {
    pattern=PATTERN_OLD;
  }
  Parser parser=new Parser(pattern,(String)msg);
  if (!parser.matches()) {
    return null;
  }
  if (!identify(parser.next(),channel,remoteAddress)) {
    return null;
  }
  if (pattern == PATTERN_OLD) {
    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(Parser.CoordinateFormat.HEM_DEG));
    position.setLongitude(parser.nextCoordinate(Parser.CoordinateFormat.HEM_DEG));
    position.setSpeed(parser.nextDouble());
    position.setCourse(parser.nextDouble());
    position.set(Event.KEY_HDOP,parser.next());
    dateBuilder.setDateReverse(parser.nextInt(),parser.nextInt(),parser.nextInt());
    position.setTime(dateBuilder.getDate());
    return position;
  }
 else {
    Date time=null;
    if (parser.hasNext(6)) {
      DateBuilder dateBuilder=new DateBuilder().setTime(parser.nextInt(),parser.nextInt(),parser.nextInt()).setDateReverse(parser.nextInt(),parser.nextInt(),parser.nextInt());
      time=dateBuilder.getDate();
    }
    List<Position> positions=new LinkedList<>();
    Parser itemParser=new Parser(PATTERN_ITEM,parser.next());
    while (itemParser.find()) {
      positions.add(decodePosition(itemParser,time));
    }
    return positions;
  }
}