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Watch out for Hibernate unsaved-value

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dion

Posts: 5028
Nickname: dion
Registered: Feb, 2003

Dion Almaer is the Editor-in-Chief for TheServerSide.com, and is an enterprise Java evangelist

Watch out for Hibernate unsaved-value

Posted: Nov 7, 2004 9:42 PM

This post originated from an RSS feed registered with Java Buzz by dion.
Original Post: Watch out for Hibernate unsaved-value Feed Title: techno.blog(Dion) Feed URL: http://feeds.feedburner.com/dion Feed Description: blogging about life the universe and everything tech	Latest Java Buzz Posts Latest Java Buzz Posts by dion Latest Posts From techno.blog(Dion)

I spent far too much time on a stupid bug of my making. Part of my model had a simple One to Many relationship. Everything was fine until when creating a new child in the many side of the house I would see an error: org.springframework.dao.InvalidDataAccessApiUsageException: object references an unsaved transient instance - save the transient instance before flushing: model.Item Why was it showing this from time to time? I studied my Hibernate mapping files. I was using an inverse="true" relationship, and the cascade options looked good. Next, I checked over the code, and all seemed well. It turned out that I had set the unsaved value in a past life: <id name="id" column="id" unsaved-value="0"> The problem was occuring ONLY on a parent with the id of 0! Duh! What I would give for top class error messages when writing apps. "Hey you idiot. You have set the unsaved-value to 0. Think that may be the problem?" :)

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