Program: 40148
Project: 40148
Buggy source:
public void gameLoop(){
  GlobalGameState.countMoves++;
  UiState.getINSTANCE().setRoundsRemaining(GlobalGameState.movesRemaining());
  List<PlayerHandler> winner=getWinner();
  if (winner.size() > 0) {
    gameOver=true;
    ArrayList<PlayerDTO> playerDTOS=new ArrayList<>();
    for (    PlayerHandler playerHandler : getPlayerHandler()) {
      playerDTOS.add(new PlayerDTO(playerHandler.getPlayerName(),new Color(playerHandler.getSnake().getHeadColor()),playerHandler.getSnake().getAllSnakePositions().size()));
    }
    ArrayList<PlayerDTO> deadPlayerDTOS=new ArrayList<>();
    for (    PlayerHandler playerHandler : deadPlayer) {
      deadPlayerDTOS.add(new PlayerDTO(playerHandler.getPlayerName(),new Color(playerHandler.getSnake().getHeadColor()),playerHandler.getSnake().getAllSnakePositions().size()));
    }
    ScreenManager.getINSTANCE().finishGame(playerDTOS,deadPlayerDTOS);
    ScreenManager.getINSTANCE().showScreen(ScreenType.WINNER_SCREEN);
  }
  for (  PlayerHandler playerHandler : playerController.getPlayerHandlerList()) {
    updateRoundForPlayer(playerHandler);
    this.playerController.updatePlayerState(new GlobalGameState());
  }
  Map<PlayerHandler,PlayerChoice> playerStatus=this.playerController.getPlayerStatus();
  for (  PlayerHandler playerHandler : playerStatus.keySet()) {
    PlayerChoice playerChoice=playerStatus.get(playerHandler);
    validateEvents(playerHandler,playerChoice);
  }
  playerStatus.clear();
  for (  PlayerHandler playerHandler : playerController.getPlayerHandlerList()) {
    List<RoundEvent> roundEvents=playerHandler.getRoundEvents();
    int collectedPoints=0;
    for (    RoundEvent roundEvent : roundEvents) {
switch (roundEvent) {
case DIED:
        playerHandler.getSnake().removeHead();
      deadPlayer.add(playerHandler);
    break;
case MOVED:
  playerHandler.moveToNextPosition();
break;
case CONFUSED:
collectedPoints++;
break;
case COLLISION_WITH_LEVEL:
collectedPoints--;
break;
case BIT_HIMSELF:
collectedPoints--;
break;
case BIT_AGENT:
if (!playerHandler.isGhostMode()) {
collectedPoints++;
}
break;
case BIT_BY_PLAYER:
if (!playerHandler.isGhostMode()) {
collectedPoints--;
}
break;
case CONSUMED_POINT:
collectedPoints++;
break;
}
}
if (collectedPoints <= 0) {
playerHandler.penalty();
if (collectedPoints <= -1) {
playerHandler.penalty();
}
}
}
for (PlayerHandler dead : deadPlayer) {
playerController.getPlayerHandlerList().remove(dead);
UiState.getINSTANCE().rip(dead.getPlayerName());
}
level.spreadPoints();
for (PlayerHandler playerHandler : playerController.getPlayerHandlerList()) {
playerHandler.endRound();
}
}

Fixed version (ground truth):
public void gameLoop(){
  GlobalGameState.countMoves++;
  UiState.getINSTANCE().setRoundsRemaining(GlobalGameState.movesRemaining());
  List<PlayerHandler> winner=getWinner();
  if (winner.size() > 0) {
    gameOver=true;
    ArrayList<PlayerDTO> playerDTOS=new ArrayList<>();
    for (    PlayerHandler playerHandler : getPlayerHandler()) {
      playerDTOS.add(new PlayerDTO(playerHandler.getPlayerName(),new Color(playerHandler.getSnake().getHeadColor()),playerHandler.getSnake().getAllSnakePositions().size()));
    }
    ArrayList<PlayerDTO> deadPlayerDTOS=new ArrayList<>();
    for (    PlayerHandler playerHandler : deadPlayer) {
      deadPlayerDTOS.add(new PlayerDTO(playerHandler.getPlayerName(),new Color(playerHandler.getSnake().getHeadColor()),playerHandler.getSnake().getAllSnakePositions().size()));
    }
    ScreenManager.getINSTANCE().finishGame(playerDTOS,deadPlayerDTOS);
    ScreenManager.getINSTANCE().showScreen(ScreenType.WINNER_SCREEN);
  }
  for (  PlayerHandler playerHandler : playerController.getPlayerHandlerList()) {
    updateRoundForPlayer(playerHandler);
    this.playerController.updatePlayerState(new GlobalGameState());
  }
  Map<PlayerHandler,PlayerChoice> playerStatus=this.playerController.getPlayerStatus();
  for (  PlayerHandler playerHandler : playerStatus.keySet()) {
    PlayerChoice playerChoice=playerStatus.get(playerHandler);
    validateEvents(playerHandler,playerChoice);
  }
  playerStatus.clear();
  for (  PlayerHandler playerHandler : playerController.getPlayerHandlerList()) {
    List<RoundEvent> roundEvents=playerHandler.getRoundEvents();
    int collectedPoints=0;
    for (    RoundEvent roundEvent : roundEvents) {
switch (roundEvent) {
case DIED:
        playerHandler.getSnake().removeHead();
      deadPlayer.add(playerHandler);
    break;
case MOVED:
  playerHandler.moveToNextPosition();
break;
case CONFUSED:
collectedPoints++;
break;
case COLLISION_WITH_LEVEL:
collectedPoints--;
break;
case BIT_HIMSELF:
collectedPoints--;
break;
case BIT_AGENT:
collectedPoints++;
break;
case BIT_BY_PLAYER:
collectedPoints--;
break;
case CONSUMED_POINT:
collectedPoints++;
break;
}
}
if (collectedPoints <= 0) {
playerHandler.penalty();
if (collectedPoints <= -1) {
playerHandler.penalty();
}
}
}
for (PlayerHandler dead : deadPlayer) {
playerController.getPlayerHandlerList().remove(dead);
UiState.getINSTANCE().rip(dead.getPlayerName());
}
level.spreadPoints();
for (PlayerHandler playerHandler : playerController.getPlayerHandlerList()) {
playerHandler.endRound();
}
}