Program: 155967
Project: 155967
Buggy source:
private Position decodeGprmc(DeviceSession deviceSession,String sentence,SocketAddress remoteAddress,Channel channel){
  if (deviceSession != null && channel != null && !(channel instanceof DatagramChannel)) {
    if (Context.getIdentityManager().lookupAttributeBoolean(deviceSession.getDeviceId(),getProtocolName() + "String_Node_Str",false,true)) {
      channel.write("String_Node_Str");
    }
  }
  Parser parser=new Parser(PATTERN_GPRMC,sentence);
  if (!parser.matches()) {
    return null;
  }
  Position position=new Position();
  position.setProtocol(getProtocolName());
  if (deviceSession != null) {
    position.setDeviceId(deviceSession.getDeviceId());
  }
  DateBuilder dateBuilder=new DateBuilder().setTime(parser.nextInt(0),parser.nextInt(0),parser.nextInt(0));
  position.setValid(parser.next().equals("String_Node_Str"));
  position.setLatitude(parser.nextCoordinate());
  position.setLongitude(parser.nextCoordinate());
  position.setSpeed(parser.nextDouble(0));
  position.setCourse(parser.nextDouble(0));
  dateBuilder.setDateReverse(parser.nextInt(0),parser.nextInt(0),parser.nextInt(0));
  position.setTime(dateBuilder.getDate());
  if (parser.hasNext(5)) {
    position.set(Position.KEY_SATELLITES,parser.nextInt());
    deviceSession=getDeviceSession(channel,remoteAddress,parser.next());
    if (deviceSession == null) {
      return null;
    }
    position.setDeviceId(deviceSession.getDeviceId());
    position.set(Position.KEY_IGNITION,parser.hasNext() && parser.next().equals("String_Node_Str"));
    position.set(Position.KEY_FUEL_LEVEL,parser.nextInt(0));
    position.set(Position.KEY_BATTERY,parser.nextInt());
  }
  if (parser.hasNext()) {
    String[] parameters=parser.next().split("String_Node_Str");
    for (int i=1; i < parameters.length; i++) {
      position.set(Position.PREFIX_IO + i,parameters[i]);
    }
  }
  if (deviceSession != null) {
    return position;
  }
 else {
    this.position=position;
    return null;
  }
}

Fixed version (ground truth):
private Position decodeGprmc(DeviceSession deviceSession,String sentence,SocketAddress remoteAddress,Channel channel){
  if (deviceSession != null && channel != null && !(channel instanceof DatagramChannel) && Context.getIdentityManager().lookupAttributeBoolean(deviceSession.getDeviceId(),getProtocolName() + "String_Node_Str",false,true)) {
    channel.write("String_Node_Str");
  }
  Parser parser=new Parser(PATTERN_GPRMC,sentence);
  if (!parser.matches()) {
    return null;
  }
  Position position=new Position();
  position.setProtocol(getProtocolName());
  if (deviceSession != null) {
    position.setDeviceId(deviceSession.getDeviceId());
  }
  DateBuilder dateBuilder=new DateBuilder().setTime(parser.nextInt(0),parser.nextInt(0),parser.nextInt(0));
  position.setValid(parser.next().equals("String_Node_Str"));
  position.setLatitude(parser.nextCoordinate());
  position.setLongitude(parser.nextCoordinate());
  position.setSpeed(parser.nextDouble(0));
  position.setCourse(parser.nextDouble(0));
  dateBuilder.setDateReverse(parser.nextInt(0),parser.nextInt(0),parser.nextInt(0));
  position.setTime(dateBuilder.getDate());
  if (parser.hasNext(5)) {
    position.set(Position.KEY_SATELLITES,parser.nextInt());
    deviceSession=getDeviceSession(channel,remoteAddress,parser.next());
    if (deviceSession == null) {
      return null;
    }
    position.setDeviceId(deviceSession.getDeviceId());
    position.set(Position.KEY_IGNITION,parser.hasNext() && parser.next().equals("String_Node_Str"));
    position.set(Position.KEY_FUEL_LEVEL,parser.nextInt(0));
    position.set(Position.KEY_BATTERY,parser.nextInt());
  }
  if (parser.hasNext()) {
    String[] parameters=parser.next().split("String_Node_Str");
    for (int i=1; i < parameters.length; i++) {
      position.set(Position.PREFIX_IO + i,parameters[i]);
    }
  }
  if (deviceSession != null) {
    return position;
  }
 else {
    this.position=position;
    return null;
  }
}