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## Chapter 11. Troubleshooting guide

Problem | Cause | Resolution
--- | --- | ---
OutOfMemoryError | Too large top level transactions or leaking transactions not finished properly. | Split updates into smaller transactions. Always make sure transactions are finished properly.
ResourceAcquisitionFailedException or an error message containing the text “The transaction is marked for rollback only” | Leaked non finished transaction tied to the current thread in state marked for rollback only. | Finish transactions properly.
DeadlockDetectedException | Concurrent updates of contended resources or not finishing transactions properly. | See Section 3.4, “Deadlocks”.

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