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Home/ Questions/Error: a different object with the same identifier value was already associated with the session - how to solve it?
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Kayla Lee
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Kayla Lee
Asked: May 18, 20222022-05-18T18:23:39+00:00 2022-05-18T18:23:39+00:00In: java

Error: a different object with the same identifier value was already associated with the session – how to solve it?

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I get an error

Hibernate error: "a different object with the same identifier value was already associated with the session: C

when trying to call session.saveOrUpdate(myAObject). How to fix the a different object with the same identifier value was already associated with the session error? Please give me some advice.

session
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    lyytutoria Expert
    2022-06-15T10:41:47+00:00Added an answer on June 15, 2022 at 10:41 am

    The cause:

    This error happens due to the B objects do not relate to the same instance of the Java C object. They are both referring to the same database row (i.e. the same primary key), but they are separate copies.

    So, the Hibernate session that while manages the entities keeps track of which Java object corresponds to which row with the same primary key.

    Solution:

    One way is to double-check that the Entities of objects B that refer to the same row are referring to the same object instance of C. Alternatively, you can disable cascade for that particular member variable. As a result, when B persists, C does not. However, you will have to save C separately. If C is a type/category table, it makes logical to keep it that way.

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  2. Louise da Costa
    2022-05-25T20:45:43+00:00Added an answer on May 25, 2022 at 8:45 pm

    Set cascade to MERGE. That should do it.

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