Re: how to clone shared object in gwt

You can emulate CloneNotSupportedException yourself to make the GWT compiler happy. The only thing that you do not have in GWT is Object.clone() as its not implemented by GWT. This means you do not get a copy of an instance if you call super.clone() in one of your top level classes. In GWT trunk I think you will get an exception now when you call Object.clone().

In general I would never really use clone() of Java. Instead I define my own interface and use it to replicate clone().

Example:

interface Copyable<T> {

  T copy();

  T deepCopy();

}

class Person implements Copyable<Person> {

  String name;

  Person friend;

  protected Person(Person other, boolean deep) {

    // super(other, deep) if Person would extend HumanBeing or similar.

    name = other.name;

    friend = other.friend;

    if(deep) {

      friend = friend.deepCopy();

    }

  }

  public Person copy() {

    return new Person(this, false);

  }

  public Person deepCopy() {

    return new Person(this, true);

  }

}

-- J.

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