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I want to delete orphan entities using hibernate and JPA on a many-to-many relationship but all that I found was this attribute the attribute. org.hibernate.annotations.CascadeType.DELETE_ORPHAN ( i.e. @Cascade(value={org.hibernate.annotations.CascadeType.DELETE_ORPHAN) ), which works only for one-to-many relationships.
I want to know if I can delete the orphan ones on my many-to-many relationship.
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Orphan removal means that dependent entities are removed when the relationship to their "parent" entity is destroyed. For example if a child is removed from a @OneToMany relationship without explicitely removing it in the entity manager.
If an entity is removed from a @OneToMany collection or an associated entity is dereferenced from a @OneToOne association, this associated entity can be marked for deletion if orphanRemoval is set to true.
From the book "Pro JPA 2":
Only relationships with single cardinality on the source side can enable orphan removal, which is why the orphanRemoval option is defined on the @OneToOne and @OneToMany relationship annotations, but on neither of the @ManyToOne or @ManyToMany annotations.
It's a bummer, but there is no JPA automated orphan removal for ManyToMany.
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