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Oracle Transaction recovery: lock conflict caught and ignored

In alert log there are a lot of "Transaction recovery: lock conflict caught and ignored" statements. I've found some information, that this error is caused when there is an active dead transaction. ...
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How do I stop a query from running if the row is locked?

I have a section of code that locks the database, updates it and then confirms. This is all working fine, if another user attempts to update the same row they cannot and their changes are discarded. ...