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    <pre><code> Hibernate merge was not meant for associating transient objects to persistent ones. </code></pre> <p>The merge() should ideally work for you because you are actually dealing with detached object. Since you are setting ids in the 'transObj' before calling merge, hibernate would consider them as detached (not transient).</p> <p>I think the problem with your code is that it is tripping hibernate. </p> <p>In your code, you are loading the 'persistObj' from the database. Now, hibernate holds this 'persistObj' in session. You are then setting some of the ids from 'persistObj' in 'transObj' and then calling merge. Some of the child objects in 'persistObj' and 'transObj' have the same ids, hibernate gets confused. </p> <pre><code>ComplexObject transObj = xstream.import("object.xml"); ComplexObject persistObj = someService.getObjByName(transObj.getName()); for (OtherObject o : c.getObjects()) { if (persistObj.getObjects().contains(o.getName())) { o.setId(persistObj.getObjectByName(o.getName()).getId()) } ... set a bunch of other IDs deeper in the object graph ... } transObj = session.merge(transObj); session.saveOrUpdate(transObj); </code></pre> <p>Try calling the the session.clear() after loading 'persistObj', so that hibernate removes the persistObj and considers only your detached object. </p> <pre><code>ComplexObject transObj = xstream.import("object.xml"); ComplexObject persistObj = someService.getObjByName(transObj.getName()); // Clear the session, so that hibernate removes 'persistObj' from it's cache session.clear(); for (OtherObject o : c.getObjects()) { if (persistObj.getObjects().contains(o.getName())) { o.setId(persistObj.getObjectByName(o.getName()).getId()) } ... set a bunch of other IDs deeper in the object graph ... } transObj = session.merge(transObj); session.saveOrUpdate(transObj); </code></pre>
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    1. POUsing Transient Entity in Hibernate to Update/Merge an existing Persistent Object
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    1. USSashi
    1. USSashi
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    1. COIf you check the comment I put on Glen's answer, I did try using clear initially before merge() and saveOrUpdate() but it tended to bring up other problems. I will try it again though and come up with a clearer response as to why it did not work or at least some error messages. Thanks.
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    2. COSorry, did not see the other comment. Yes, pls post the errors you see with clear(). I would definitely not have the 'persistObt' and 'tranObj' attached to the same session because you are trying to represent the same database row using two different instances of the object. Hibernate normally does not allow this.
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    3. COI just tried this again. I ran clearSession(), merge(), then saveOrUpdate(). Like in my original question, I'm getting the deleted object would be resaved error.
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