Program: 81435
Project: 81435
Buggy source:
public void start() throws Exception {
  logger.info("String_Node_Str");
  final IPlayerFactory factory;
  try {
    Class<?> c=Thread.currentThread().getContextClassLoader().loadClass(clientClass);
    factory=(IPlayerFactory)c.newInstance();
  }
 catch (  ClassCastException e) {
    logger.error("String_Node_Str" + IPlayerFactory.class.getName());
    return;
  }
  logger.info("String_Node_Str");
  final List<ServerInfo> si=GameServerClient.lookup(UDPBroadcastPort,1,discoveryTimeout);
  if (si.size() != 1) {
    logger.warn("String_Node_Str");
    return;
  }
  final ServerInfo server=si.get(0);
  final GameServerClient client=new GameServerClient(server);
  client.connect();
  GameHandle handle;
  if (boardName != null) {
    logger.info("String_Node_Str" + gameName + "String_Node_Str"+ boardName+ "String_Node_Str");
    handle=client.createGame(gameName,boardName);
  }
 else {
    int attempts=5;
    do {
      logger.info("String_Node_Str" + attempts + "String_Node_Str"+ gameName);
      handle=client.getGame(gameName);
      if (handle == null)       Thread.sleep(1000);
    }
 while (handle == null && --attempts > 0);
    if (handle == null) {
      logger.error("String_Node_Str" + gameName + "String_Node_Str");
      return;
    }
  }
  final GameClient gameClient=new GameClient(handle,server);
  final UDPPacketEmitter serverUpdater=new UDPPacketEmitter(new DatagramSocket());
  serverUpdater.setDefaultTarget(Inet4Address.getByName(server.serverAddress),server.UDPFeedbackPort);
  final String fullName=this.playerName;
  final String playerName=Player.split(this.playerName)[1];
  final PlayerHandle playerHandle=client.joinGame(handle,fullName);
  final IPlayerController localController=factory.getController(playerName);
  final AsyncPlayerController asyncController=new AsyncPlayerController(localController);
  gameClient.addListener(asyncController);
  gameClient.addListener(new ControllerStateDispatch(playerHandle,asyncController,serverUpdater));
  client.disconnect();
  if (!noSound)   gameClient.attachSound();
  if (!noView)   gameClient.attachView(playerHandle.playerName);
  gameClient.runLoop();
}

Fixed version (ground truth):
public void start() throws Exception {
  logger.info("String_Node_Str");
  final IPlayerFactory factory;
  try {
    Class<?> c=Thread.currentThread().getContextClassLoader().loadClass(clientClass);
    factory=(IPlayerFactory)c.newInstance();
  }
 catch (  ClassCastException e) {
    logger.error("String_Node_Str" + IPlayerFactory.class.getName());
    return;
  }
  logger.info("String_Node_Str");
  final List<ServerInfo> si=GameServerClient.lookup(UDPBroadcastPort,1,discoveryTimeout);
  if (si.size() != 1) {
    logger.warn("String_Node_Str");
    return;
  }
  final ServerInfo server=si.get(0);
  final GameServerClient client=new GameServerClient(server);
  client.connect();
  GameHandle handle;
  if (boardName != null) {
    logger.info("String_Node_Str" + gameName + "String_Node_Str"+ boardName+ "String_Node_Str");
    handle=client.createGame(gameName,boardName);
  }
 else {
    int attempts=5;
    do {
      logger.info("String_Node_Str" + attempts + "String_Node_Str"+ gameName);
      handle=client.getGame(gameName);
      if (handle == null)       Thread.sleep(1000);
    }
 while (handle == null && --attempts > 0);
    if (handle == null) {
      logger.error("String_Node_Str" + gameName + "String_Node_Str");
      return;
    }
  }
  final GameClient gameClient=new GameClient(handle,server);
  final UDPPacketEmitter serverUpdater=new UDPPacketEmitter(new DatagramSocket());
  serverUpdater.setDefaultTarget(Inet4Address.getByName(server.serverAddress),server.UDPFeedbackPort);
  final String fullName=this.playerName;
  final String playerName=Player.split(this.playerName)[1];
  final PlayerHandle playerHandle=client.joinGame(handle,fullName);
  final IPlayerController localController=factory.getController(playerName);
  final AsyncPlayerController asyncController=new AsyncPlayerController(localController);
  gameClient.addListener(asyncController);
  gameClient.addListener(new ControllerStateDispatch(playerHandle,asyncController,serverUpdater));
  client.disconnect();
  if (!noSound)   gameClient.attachSound();
  if (!noView)   gameClient.attachView(playerName);
  gameClient.runLoop();
}