Is it possible to have immutable fields in Hibernate/JPA?

Question

In our application, we need to have fields that are assignable only once.

At first we thought of encapsulating the fields and making the setters private. However, some q

Answer 1

You can mark an entity with @Entity(mutable=false) or @Immutable annotations for the framework to make use of this fact for performance gain in caching and such. (Hibernate)

Then you can use an immutable wrapper class like this:

public class ImmutableStuff {
    private final FooField barValue;

    public ImmutableStuff(Stuff stuff) {
        barValue = stuff.barValue;
    }

    public FooField getBarValue(){
        return barValue;
    }
}