I'm having a Product entity, which has a manufacturers attribute:

@ElementCollection(targetClass = java.lang.String.class, fetch = FetchType.EAGER)
--
@CollectionTable(name = "manufacturers", joinColumns = @JoinColumn(name = "man_id"), indexes = { @Index(columnList = "man_id") })
@Column(name = "manufacturer")
private Collection<String> manufacturers;

I also have a ProductListener with two @PreUpdate and @PrePersist methods. However none of these methods are triggered when I update the collection of manufacturers. Either we need to trigger the event when the collection is updated, or add some new annotations like @PreCollectionUpdate and @PreCollectionPersist (hibernate style).