I am trying to use an empty id tag in a data mapping because I have a composite key and I want to assign both keys manually. I have tried using the composite-id tag but that fails as well, so I will post that issue in a separate thread.

According to the info here:

http://www.hibernate.org/hib_docs/reference/en/html/mapping.html



and



So I should be able to have an id tag with no name attribute.

Here is the .hbm.xml file.



I am using hibernate through the grails framework. The exception thrown is org.hibernate.InvalidMappingException: Could not parse mapping document.

If I fill in the column info for the id tag, it works fine.

This appears to me to be a bug in the hibernate documentation. I tested this outside of the Grails framework, in a pure hibernate environment, and the bottom line is that you cannot have an empty id tag.

If you do, you will get an exception saying you need to specify a type for the tag. If you specify a type (e.g. type="integer"), then hibernate will expect that your table has a column called id.