Program: 109375
Project: 109375
Buggy source:
private DarkBotMCSpambot(DarkBot darkBot,String server,String username,String password,String sessionId,String loginProxy,String proxy,String owner){
synchronized (bots) {
    bots.add(this);
synchronized (slotsTaken) {
      slotsTaken.notifyAll();
    }
  }
  MinecraftBotData.Builder builder=MinecraftBotData.builder();
  if (proxy != null && !proxy.isEmpty()) {
    int port=80;
    ProxyType type=ProxyType.SOCKS;
    if (proxy.contains("String_Node_Str")) {
      String[] parts=proxy.split("String_Node_Str");
      proxy=parts[0];
      port=Integer.parseInt(parts[1]);
      if (parts.length > 2)       type=ProxyType.values()[Integer.parseInt(parts[2]) - 1];
    }
    builder.withSocksProxy(new ProxyData(proxy,port,type));
    this.proxy=new Proxy(Proxy.Type.SOCKS,new InetSocketAddress(proxy,port));
  }
  if (loginProxy != null && !loginProxy.isEmpty()) {
    int port=80;
    if (loginProxy.contains("String_Node_Str")) {
      String[] parts=loginProxy.split("String_Node_Str");
      loginProxy=parts[0];
      port=Integer.parseInt(parts[1]);
    }
    builder.withHttpProxy(new ProxyData(loginProxy,port,ProxyType.HTTP));
    this.loginProxy=new Proxy(Proxy.Type.HTTP,new InetSocketAddress(loginProxy,port));
  }
  builder.withUsername(username);
  if (sessionId != null)   builder.withSessionId(sessionId);
 else   builder.withPassword(password);
  if (server != null && !server.isEmpty()) {
    int port=25565;
    if (server.contains("String_Node_Str")) {
      String[] parts=server.split("String_Node_Str");
      server=parts[0];
      port=Integer.parseInt(parts[1]);
    }
    builder.withServer(server).withPort(port);
  }
 else   throw new IllegalArgumentException("String_Node_Str");
  this.owner=owner;
  MinecraftBotData botData=builder.build();
  System.setProperty("String_Node_Str","String_Node_Str");
  System.setProperty("String_Node_Str","String_Node_Str");
  System.out.println("String_Node_Str" + username + "String_Node_Str");
  bot=new MinecraftBot(darkBot,botData);
  TaskManager taskManager=bot.getTaskManager();
  taskManager.registerTask(new FallTask(bot));
  taskManager.registerTask(new FollowTask(bot));
  taskManager.registerTask(new DefendTask(bot));
  taskManager.registerTask(new AttackTask(bot));
  taskManager.registerTask(new HostileTask(bot));
  taskManager.registerTask(new EatTask(bot));
  connectionHandler=bot.getConnectionHandler();
  Session session=bot.getSession();
  System.gc();
  System.out.println("String_Node_Str" + username + "String_Node_Str"+ amountJoined.incrementAndGet()+ "String_Node_Str");
  bot.getEventManager().registerListener(this);
  bot.getGameHandler().registerListener(this);
  long lastShoutTime=System.currentTimeMillis();
  while (bot.isConnected()) {
  }
synchronized (bots) {
    bots.remove(this);
  }
  amountJoined.decrementAndGet();
  slotsTaken.decrementAndGet();
synchronized (slotsTaken) {
    slotsTaken.notifyAll();
  }
}

Fixed version (ground truth):
private DarkBotMCSpambot(DarkBot darkBot,String server,String username,String password,String sessionId,String loginProxy,String proxy,String owner){
synchronized (bots) {
    bots.add(this);
synchronized (slotsTaken) {
      slotsTaken.notifyAll();
    }
  }
  MinecraftBotData.Builder builder=MinecraftBotData.builder();
  if (proxy != null && !proxy.isEmpty()) {
    int port=80;
    ProxyType type=ProxyType.SOCKS;
    if (proxy.contains("String_Node_Str")) {
      String[] parts=proxy.split("String_Node_Str");
      proxy=parts[0];
      port=Integer.parseInt(parts[1]);
      if (parts.length > 2)       type=ProxyType.values()[Integer.parseInt(parts[2]) - 1];
    }
    builder.withSocksProxy(new ProxyData(proxy,port,type));
    this.proxy=new Proxy(Proxy.Type.SOCKS,new InetSocketAddress(proxy,port));
  }
  if (loginProxy != null && !loginProxy.isEmpty()) {
    int port=80;
    if (loginProxy.contains("String_Node_Str")) {
      String[] parts=loginProxy.split("String_Node_Str");
      loginProxy=parts[0];
      port=Integer.parseInt(parts[1]);
    }
    builder.withHttpProxy(new ProxyData(loginProxy,port,ProxyType.HTTP));
    this.loginProxy=new Proxy(Proxy.Type.HTTP,new InetSocketAddress(loginProxy,port));
  }
  builder.withUsername(username);
  if (sessionId != null)   builder.withSessionId(sessionId);
 else   builder.withPassword(password);
  if (server != null && !server.isEmpty()) {
    int port=25565;
    if (server.contains("String_Node_Str")) {
      String[] parts=server.split("String_Node_Str");
      server=parts[0];
      port=Integer.parseInt(parts[1]);
    }
    builder.withServer(server).withPort(port);
  }
 else   throw new IllegalArgumentException("String_Node_Str");
  this.owner=owner;
  MinecraftBotData botData=builder.build();
  System.setProperty("String_Node_Str","String_Node_Str");
  System.setProperty("String_Node_Str","String_Node_Str");
  System.out.println("String_Node_Str" + username + "String_Node_Str");
  bot=new MinecraftBot(darkBot,botData);
  TaskManager taskManager=bot.getTaskManager();
  taskManager.registerTask(new FallTask(bot));
  taskManager.registerTask(new FollowTask(bot));
  taskManager.registerTask(new DefendTask(bot));
  taskManager.registerTask(new AttackTask(bot));
  taskManager.registerTask(new HostileTask(bot));
  taskManager.registerTask(new EatTask(bot));
  connectionHandler=bot.getConnectionHandler();
  Session session=bot.getSession();
  System.gc();
  System.out.println("String_Node_Str" + username + "String_Node_Str"+ amountJoined.incrementAndGet()+ "String_Node_Str");
  bot.getEventManager().registerListener(this);
  long lastShoutTime=System.currentTimeMillis();
  while (bot.isConnected()) {
  }
synchronized (bots) {
    bots.remove(this);
  }
  amountJoined.decrementAndGet();
  slotsTaken.decrementAndGet();
synchronized (slotsTaken) {
    slotsTaken.notifyAll();
  }
}