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detached entity passed to persist

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I have 3 entities user, patient and doctor. Every doctor or patient is a user. I don't use inheritance strategy because I couldn't get an answer from my question here: Previous Problem

Now I'm trying to achieve a similar point without inheritance. Schema is like that:
User <--- OneToOne --> Doctor
User <--- OneToOne --> Patient
Patient <--- ManyToMany --> Doctor

My entities:



I've written junit tests for these entities. The doctor methods are working but patients' not.
This one creates 3 users(2 for patients 1 for doctor), 2 patients and a doctor.

But that one doesn't work as I expect:


The for loop inside testCreatePatient executes up to unitNumber. When i becomes unitNumber + 1 (I mean 21), I'm getting detached entity passed to persist: tr.com.stigma.db.entity.User. It creates 20 doctors, 20 patients and 40 users until i gets to 20. At the 21st insert, I try to add a new patient to an existing doctor, consequently to an existing user. How can I do this?

Stack trace is here:
Gokcen Guner
Posts: 9
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Although nobody replied, I solved it.
I changed @ManyToMany(cascade = { CascadeType.PERSIST, CascadeType.MERGE, CascadeType.REMOVE }) to @ManyToMany(cascade = { CascadeType.ALL })

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