Sorry about this post, the problem was because i set wrong the join and
inverse columns.
Thanks.
2014-09-24 15:44 GMT-05:00 José Luis Cetina <maxtorz...@gmail.com>:
>
> Hi, im not sure if i have a clear concept about the Many to Many persist.
>
> I have this scenario.
>
>
> table: courses
> -course_id
> -description
>
> table: documents
> -docuemnt_id
> -description
>
> table: courses_documents
> -course_id
> -docuemnt_id
>
> Then my entities:
>
> public class Course{
>
> private int courseId;
>
> @ManyToMany(cascade = CascadeType.ALL)
> @JoinTable(name = "courses_documents",
> inverseJoinColumns =
> @JoinColumn(name="course_id"),
> joinColumns=
> @JoinColumn(name="document_id"))
> private Set<Document> documents;
>
> }
>
> public class Document{
>
> private int documentId;
>
> @ManyToMany(mappedBy="documents"
> private Set<Course> courses;
> }
>
>
>
> Then when i want to persist i did this.
>
> Course course = em.merge(aCourse);
>
> //i get a reference of an existed document
> Document doc1 = entityManager.getReference(...);
>
> //then i add that document to course
> course.getDocuments().add(doc1);
>
>
> then jpa tries to insert twice in courses_documents why twice??
>
> Thanks
>
>
> --
> -------------------------------------------------------------------
> *José Luis Cetina*
> -------------------------------------------------------------------
>
--
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*José Luis Cetina*
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