Hibernate - map multiple foreign keys on same table

Question

I have one entity that have two foreign keys on the same table, for example:

class A {
    B _source;
    B _target;
}
class B {
    List<A> _as;
}

My question is how to map all "as" by source and target? I'm using hibernate 4

Answer 1

You cannot map all but you can achieve something like this:

public class A {
    @ManyToOne
    B _source;

    @ManyToOne
    B _target;
}

public class B {
    @OneToMany(mappedBy = "_source")
    List<A> sources;

    @OneToMany(mappedBy = "_target")
    List<A> targets;

    public List<A> getSources() {
        return sources;
    }

    public List<A> getTargets() {
        return targets;
    }

    public List<A> getAll() {
        return Stream.concat(getSources().stream(), getTargets().stream()).collect(Collectors.toList());
    }

}

with the getAll method. (You may also need to apply distinct to that stream)