javaserializableobject-serialization

Serializable a object properties too

When I add Serializable to a class, do I need to add Serializable to the classes of all fields too?

For example,

public class User implements Serializable {
    private List<Role> role;
    private Task task;
}

Do I need to add Serializable to Role and Task, too?

public class Task implements Serializable{
    // ...
}

public class Role implements Serializable{
    // ...
}
Solution

  • Yes, you do; if your classes Task and Role are not Serializable, you'll get a java.io.NotSerializableException if you try to serialize an instance of User.

    Ofcourse, if Task or Role contain other non-primitive, non-transient fields, they would have to be Serializable too, etc.