Hi ,
Is there a seam-way to implement @Entitylisteners ? I've read in the book 'Java
Persistence with Hibernate' that the user of EntityManagers is not allowed in
callbacks. However; thats the usecase:
I've two Entities which are associated through a @ManyToMany association and i
like to implement a last-save-wins-strategy for this set.
| @Entity
| @Table (name="t_foo")
| @EntityListeners(value={Foolistener.class})
| public class Foo {
| @Id
| private Long id;
|
| @Basic
| private String name;
|
| @ManyToMany (fetch=FetchType.LAZY)
| @JoinTable (name="t_foo_bar",
| [EMAIL PROTECTED](name="foo_id"),
| [EMAIL PROTECTED](name="bar_id"))
| private Set<Bar> bars;
|
| .....
|
| }
|
| @Entity
| @Table (name="t_bar")
| public class Bar {
| @Id
| private Long id;
| @Basic
| private String name;
| @ManyToMany (fetch=FetchType.LAZY, mappedBy="bars")
| private Set<Foo> foos;
|
| ....
| }
|
| public class Foolistener {
|
| @PrePersist
| public void prePersist (Foo foo) {
| // delete the all entries in t_foo_bar which
| // reference too foo.getId()
| }
|
| @PreUpdate
| public void preUpdate (Foo foo) {
| // delete the all entries in t_foo_bar which
| // reference too foo.getId()
| }
|
| }
|
The first issue on this is, that the callback is only called if the
Entity-fields are changed, but not, if the included set changed only. Does
anyone know why?
I know i could add a 'changed-set' - flag .. which is not very comfortable if
the set is changed directly ;)
I tried to add @Name and @In annotations to the FooListener - but this seams
not to work.
I've not much experience with Hibernate-jpa because i worked with jpox-jdo
before. If i remember correctly it was no problem to have (restricted)
database-access in callback-methods .
Any ideas ?
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