Any nice way to make two immutable objects refer to eachother?

Question

Take these two Java classes:

class User {
   final Inventory inventory;
   User (Inventory inv) {
       inventory = inv;
   }
}

class Inventory {
   final User         


        

Answer 1

class User {
    private final Inventory inventory;
    User (/*whatever additional args are needed to construct the inventory*/) {
        //populate user fields
        inventory = new Inventory(this);
    }
}

class Inventory {
    private final User owner;
    Inventory (User own) {
        owner = own;
    }
}

That's the best I can think of. Maybe there's a better pattern.