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Editorial Team
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Asked: 2026-05-26T23:33:57+00:00

I use EntityManager to save/update my entities in database and Hibernate as jpa provider.

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I use EntityManager to save/update my entities in database and Hibernate as jpa provider. My transactions are handled by container.

The problem: I need to add an entity that might have been already stored in database, so an exception will be thrown. In this case I need to repeat insertion but with another value. But as long as an exception is thrown the session has gone bad and I need to create a new session and rollback the transaction. How can I do this when I’m using CMT? Or if there is another way to do this?

Thank you.

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1 Answer

  1. Editorial Team

    You could use the TransactionAttribute(REQUIRES_NEW) for your persistence method. If the bean invoking your method will catch an exception, it might do some changes and invoke the method once again.
    This will rollback just the persistence-method transaction – not the invoking bean one.

    However, remember that if your Use Case doesn’t require you to do EntityManager#persistence(-), you might be interested in EntityManager#merge(-) operation. It will persist the entity if it doesn’t already exist or update it if it already exists (the existence is checked based on the PK).

    HTH.

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