org.hibernate.PersistentObjectException: detached entity passed to persist - ManyToMany Mapping

Question

I have entity Patient and entity Test.
Both have ManyToMany relationships each other.
I added CASCADE_TYPE=ALL at both sides.
I am using Hibernate EntityManager's persist(Patient); method.
When i execute it it is throwing "org.hibernate.PersistentObjectException: detached entity passed to persist: Test"
These are the screens.

The Patient class Patient Class - Mapping

The Test class Test Class - Mapping

If anyone have solution please share it.

Thanks.

Please post the code that you have written to persist these objects — Kiran Kumar, Dec 25 '16 at 13:05

score 0 · Answer 1 · answered Dec 25 '16 at 13:16

0

thanks. i changed it to em.merge() from em.persist(). works fine.

answered Dec 25 '16 at 13:16

Chandrashekhar Bakker

13
3

score 0 · Accepted Answer · edited May 23 '17 at 12:33

merge and persist do pretty different things with your entity. Are you really sure that merge accomplishes what you intended to do in the first place ? (see this topic over here)

Without seeing the code that you wrote to persist the test - entity, I can't really tell you what went wrong, but I could imagine it having something to do with the manyToMany-relationships that you have there. Are you sure you want to cascade.ALL ? If you remove a test-instance from the database, the cascade will remove every patient in that list. And then, for every patient in that list, it will cascade.REMOVE every test in the List<test>.

score -1 · Answer 3 · answered Dec 25 '16 at 13:07

-1

I suggest try to modify CASCADE_TYPE=PERSIST.

answered Dec 25 '16 at 13:07

lenzhao

1
1

org.hibernate.PersistentObjectException: detached entity passed to persist - ManyToMany Mapping

3 Answers3