I have an abstract Entity
public class Entity<ID> {
private ID id;
public ID getId() {
return id;
}
public void setId(ID id) {
this.id = id;
}
}
And a User which inherits from Entity
public class User extends Entity<Long> implements Serializable {
private String name;
private String email;
private List<String> friends;
public User(Long ID, String name, String email) {
this.setId(ID);
this.name = name;
this.email = email;
this.friends = new ArrayList<>();
}
}
The client creates a connection with the server and ask for a User. The server responses like this: In main method:
try (ServerSocket ss = new ServerSocket(6666)) {
while (true) {
Socket s = ss.accept();
Thread t = new ServeConnection(s);
t.start();
}
}
...
private static class ServeConnection extends Thread {
public ServeConnection(Socket s) {
this.s = s;
}
public void run() {
try (ObjectInputStream is = new ObjectInputStream(s.getInputStream());
ObjectOutputStream os = new ObjectOutputStream(s.getOutputStream())) {
...
User u = new User(1, "Name", "Email@gmail.com");
os.writeObject(u);
}
}
The client reads the object but the id is set to null
...
User u = (User) is.readObject();
System.out.println(u); // id=null, name="Name", email="Email@gmail.com"
Why is the id set to null? Thank you
