Program: 156223
Project: 156223
Buggy source:
@Override protected Object decode(ChannelHandlerContext ctx,Channel channel,Object msg) throws Exception {
  String sentence=(String)msg;
  if (sentence.contains("String_Node_Str")) {
    if (channel != null) {
      channel.write("String_Node_Str");
    }
    return null;
  }
  if (sentence.length() == 15 && Character.isDigit(sentence.charAt(0))) {
    if (channel != null) {
      channel.write("String_Node_Str");
    }
    return null;
  }
  Matcher parser=pattern.matcher(sentence);
  if (!parser.matches()) {
    Log.info("String_Node_Str");
    return null;
  }
  Position position=new Position();
  StringBuilder extendedInfo=new StringBuilder("String_Node_Str");
  Integer index=1;
  String imei=parser.group(index++);
  try {
    position.setDeviceId(getDataManager().getDeviceByImei(imei).getId());
  }
 catch (  Exception error) {
    Log.warning("String_Node_Str" + imei);
    return null;
  }
  extendedInfo.append("String_Node_Str");
  extendedInfo.append(parser.group(index++));
  extendedInfo.append("String_Node_Str");
  Calendar time=Calendar.getInstance(TimeZone.getTimeZone("String_Node_Str"));
  time.clear();
  time.set(Calendar.YEAR,2000 + Integer.valueOf(parser.group(index++)));
  time.set(Calendar.MONTH,Integer.valueOf(parser.group(index++)) - 1);
  time.set(Calendar.DAY_OF_MONTH,Integer.valueOf(parser.group(index++)));
  int localHours=Integer.valueOf(parser.group(index++));
  int localMinutes=Integer.valueOf(parser.group(index++));
  int utcHours=Integer.valueOf(parser.group(index++));
  int utcMinutes=Integer.valueOf(parser.group(index++));
  time.set(Calendar.HOUR,localHours);
  time.set(Calendar.MINUTE,localMinutes);
  time.set(Calendar.SECOND,Integer.valueOf(parser.group(index++)));
  time.set(Calendar.MILLISECOND,Integer.valueOf(parser.group(index++)));
  int deltaMinutes=(localHours - utcHours) * 60 + localMinutes - utcMinutes;
  if (deltaMinutes <= -12 * 60) {
    deltaMinutes+=24 * 60;
  }
 else   if (deltaMinutes > 12) {
    deltaMinutes-=24 * 60;
  }
  time.add(Calendar.MINUTE,-deltaMinutes);
  position.setTime(time.getTime());
  position.setValid(parser.group(index++).compareTo("String_Node_Str") == 0 ? true : false);
  Double latitude=Double.valueOf(parser.group(index++));
  latitude+=Double.valueOf(parser.group(index++)) / 60;
  if (parser.group(index++).compareTo("String_Node_Str") == 0)   latitude=-latitude;
  position.setLatitude(latitude);
  Double lonlitude=Double.valueOf(parser.group(index++));
  lonlitude+=Double.valueOf(parser.group(index++)) / 60;
  String hemisphere=parser.group(index++);
  if (hemisphere != null) {
    if (hemisphere.compareTo("String_Node_Str") == 0)     lonlitude=-lonlitude;
  }
  position.setLongitude(lonlitude);
  position.setAltitude(0.0);
  position.setSpeed(Double.valueOf(parser.group(index++)));
  String course=parser.group(index++);
  if (course != null) {
    position.setCourse(Double.valueOf(course));
  }
 else {
    position.setCourse(0.0);
  }
  position.setExtendedInfo(extendedInfo.toString());
  return position;
}

Fixed version (ground truth):
@Override protected Object decode(ChannelHandlerContext ctx,Channel channel,Object msg) throws Exception {
  String sentence=(String)msg;
  if (sentence.contains("String_Node_Str")) {
    if (channel != null) {
      channel.write("String_Node_Str");
    }
    return null;
  }
  if (sentence.length() == 15 && Character.isDigit(sentence.charAt(0))) {
    if (channel != null) {
      channel.write("String_Node_Str");
    }
    return null;
  }
  Matcher parser=pattern.matcher(sentence);
  if (!parser.matches()) {
    Log.info("String_Node_Str");
    return null;
  }
  Position position=new Position();
  StringBuilder extendedInfo=new StringBuilder("String_Node_Str");
  Integer index=1;
  String imei=parser.group(index++);
  try {
    position.setDeviceId(getDataManager().getDeviceByImei(imei).getId());
  }
 catch (  Exception error) {
    Log.warning("String_Node_Str" + imei);
    return null;
  }
  extendedInfo.append("String_Node_Str");
  extendedInfo.append(parser.group(index++));
  extendedInfo.append("String_Node_Str");
  Calendar time=Calendar.getInstance(TimeZone.getTimeZone("String_Node_Str"));
  time.clear();
  time.set(Calendar.YEAR,2000 + Integer.valueOf(parser.group(index++)));
  time.set(Calendar.MONTH,Integer.valueOf(parser.group(index++)) - 1);
  time.set(Calendar.DAY_OF_MONTH,Integer.valueOf(parser.group(index++)));
  int localHours=Integer.valueOf(parser.group(index++));
  int localMinutes=Integer.valueOf(parser.group(index++));
  int utcHours=Integer.valueOf(parser.group(index++));
  int utcMinutes=Integer.valueOf(parser.group(index++));
  time.set(Calendar.HOUR,localHours);
  time.set(Calendar.MINUTE,localMinutes);
  time.set(Calendar.SECOND,Integer.valueOf(parser.group(index++)));
  time.set(Calendar.MILLISECOND,Integer.valueOf(parser.group(index++)));
  int deltaMinutes=(localHours - utcHours) * 60 + localMinutes - utcMinutes;
  if (deltaMinutes <= -12 * 60) {
    deltaMinutes+=24 * 60;
  }
 else   if (deltaMinutes > 12 * 60) {
    deltaMinutes-=24 * 60;
  }
  time.add(Calendar.MINUTE,-deltaMinutes);
  position.setTime(time.getTime());
  position.setValid(parser.group(index++).compareTo("String_Node_Str") == 0 ? true : false);
  Double latitude=Double.valueOf(parser.group(index++));
  latitude+=Double.valueOf(parser.group(index++)) / 60;
  if (parser.group(index++).compareTo("String_Node_Str") == 0)   latitude=-latitude;
  position.setLatitude(latitude);
  Double lonlitude=Double.valueOf(parser.group(index++));
  lonlitude+=Double.valueOf(parser.group(index++)) / 60;
  String hemisphere=parser.group(index++);
  if (hemisphere != null) {
    if (hemisphere.compareTo("String_Node_Str") == 0)     lonlitude=-lonlitude;
  }
  position.setLongitude(lonlitude);
  position.setAltitude(0.0);
  position.setSpeed(Double.valueOf(parser.group(index++)));
  String course=parser.group(index++);
  if (course != null) {
    position.setCourse(Double.valueOf(course));
  }
 else {
    position.setCourse(0.0);
  }
  position.setExtendedInfo(extendedInfo.toString());
  return position;
}