Hi together,
i have a little problem with the key-class.
I have two Entities which are linked (OneToOne):
@Entity
public class Coding{
@OneToOne(cascade=CascadeType.ALL)
protected Category category;
...
@Entity
public class Category {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private Key id;
.....
For interact with the Client i transform the EntityClasses in DTOs (in
general i replaces the Key id field to a Long Field). When i now
create such a DTO on client Side, i transform the DTO back to an
Entity, while i am generating the Key Class:
(i generate the Coding-DTO to an Coding-Entity and therefor i convert
here the Category-DTO to an Category-Entity)
i reCreate the KeyClass with the long value:
key=KeyFactory.createKey(Category.class.getSimpleName(), catDTO.id);
in general this works (e.g to edit an Coding-Entity this works fine
because JPA recognize after conversion (DTO->Entity) over the
generated Key Object that the Entity exists) But in this case, the
converted "Category"Entity (which HAVE a Key with the existing ID), is
created as an new Entity while persists (and get a new Key-ID)
I cann just guess, that the cascade type is the reason ("@OneToOne
(cascade=CascadeType.ALL") but with another cascadetype the commit
crashes..
Hope the problem becomes clear, and someone have an idea.
thanks a lot
Dom
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