I am creating a multiplayer game in Java with a server and multiple clients. Everything runs perfectly, until I press the Kick-button in the server to kick a client.

Error at receive thread of server, after kicking the first person who joined out of three:

java.lang.IndexOutOfBoundsException: Index: 2, Size: 2
    at java.util.ArrayList.rangeCheck(ArrayList.java:604)
    at java.util.ArrayList.get(ArrayList.java:382)
  > at networktest.Server$3.run(Server.java:186)
    at java.lang.Thread.run(Thread.java:722)

The pointed line is the ois = new ObjectInputStream where I send datatype. The server kicks the first person perfectly, but removes the second one in the list too, with an error of java.lang.ClassCastException.

server receive:

private static Thread receive = new Thread()
{
    @Override
    public void run()
    {
        ObjectInputStream ois;

        while (true)
        {
            for (int i = 0; i < list_sockets.size(); i++)
            {
                try
                {
                    ois = new ObjectInputStream(list_sockets.get(i).getInputStream());
                    int receive_state = (Integer) ois.readObject(); // receive state

                                            ois = new ObjectInputStream(list_sockets.get(i).getInputStream());
                    byte datatype = (byte) ois.readObject(); // receive datatype

                                            if(datatype == 2){
                                                ois = new ObjectInputStream(list_sockets.get(i).getInputStream());
                                                ChatLine chatLine = (ChatLine) ois.readObject(); // receive ChatLine
                                            } else if (datatype == 0){
                                                ois = new ObjectInputStream(list_sockets.get(i).getInputStream());
                                                DataPackage dp = (DataPackage) ois.readObject(); // receive dp
                                                list_data.set(i, dp);
                                            }

                    if (receive_state == 1) // Client Disconnected by User
                    {
                        disconnectClient(i);
                        i--;
                    }
                }
                catch (Exception ex) // Client Disconnected (Client Didn't Notify Server About Disconnecting)
                {
                                        System.err.println("Error @ receive:");
                                        ex.printStackTrace();
                    disconnectClient(i);
                    i--;
                }
            }
                            try {
                                this.sleep(3);
                            } catch (InterruptedException ex) {
                                Logger.getLogger(Server.class.getName()).log(Level.SEVERE, null, ex);
                            }
        }
    }
};

user send:

Thread send = new Thread()
{
    public void run()
    {
        ObjectOutputStream oos;
        byte datatype = 0;

        while (connected){
            if (socket != null){
                try {
                    DataPackage dp = new DataPackage();
                    dp.x = Client.player.x;
                    dp.y = Client.player.y;
                    dp.username = username;
                    dp.charType = charType;
                    dp.walking = (byte)Client.player.walking;
                    if (Client.outputChatLine.line != null)
                        datatype = 2;
                    else {
                        datatype = 0;
                    }

                    oos = new ObjectOutputStream(socket.getOutputStream());
                    oos.writeObject(Integer.valueOf(Client.this.state)); // send state

                    oos = new ObjectOutputStream(socket.getOutputStream());
                    oos.writeObject(Byte.valueOf(datatype)); // send datatype

                    if (datatype == 2)
                    {
                        oos.reset();
                        oos.writeObject(Client.outputChatLine);
                        Client.outputChatLine = new ChatLine();
                    } else {
                        oos = new ObjectOutputStream(socket.getOutputStream());
                        oos.writeObject(dp);
                    }

                    if (Client.this.state == 1) {
                        connected = false;
                        socket = null;

                        JOptionPane.showMessageDialog(null, "Client Disconnected", "Info", 1);
                        System.exit(0);
                    }

                }
                catch (Exception ex){}
            }
            try {
                this.sleep(2);
            } catch (InterruptedException ex) {
                Logger.getLogger(Client.class.getName()).log(Level.SEVERE, null, ex);
            }
        }
    }
};

disconnect client method:

public static void disconnectClient(int index)
{
    try
    {
        list_clients_model.removeElementAt(index);
        list_client_states.remove(index);
        list_data.remove(index);
        list_sockets.remove(index);
    }
    catch (Exception ex) {}
}

Does anyone know how to solve this?