I have the following model

@Entity
class Element {
    @Id
    int id;

    @Version
    int version;

    @ManyToOne
    Type type;
}

@Entity
class Type {
    @Id
    int id;

    @Version
    int version;

    @OneToMany(mappedBy="type")
    Collection<Element> elements;

    @Basic(optional=false)
    boolean disabled;
}

and would like to allow Type.disabled = true only if Type.elements is empty. Is there a way to do it atomically?

I would like to prevent an insertion of an Element in a transaction while the corresponding Type is being disabled by an other transaction.