How to fix an error when sending an object to the server?

Question

Java

Client side

private static Socket socket;

    public static void init() {
        try {
            socket =  new Socket("localhost",8888);
            handle();

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static void handle() throws IOException {
        ObjectOutputStream dos =  new ObjectOutputStream(socket.getOutputStream());
        Definition def = new Definition("g", "gbv");
        System.out.println(def.hashCode());
        dos.writeObject(def);
        dos.flush();

    }

Server part

@Override
    public void run() {
        while (true) {
            try {
                ObjectInputStream dis = new ObjectInputStream(this.client.getInputStream());
                dis.readObject();


            } catch (IOException e) {
                e.printStackTrace();
            } catch (ClassNotFoundException e) {
                e.printStackTrace();
            }
            try {
                Thread.sleep(10);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

Error
java.io.EOFException
at java.io.ObjectInputStream$PeekInputStream.readFully
I am writing with maven. The Definition class is written in one of the modules