I'm using Hibernate 2.0.3.

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Here's a peace of my mapping file
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( ... )
<!-- bi-directional one-to-one association to OpControloSq0589 -->
<one-to-one
name="opControloSq0589"
class="xpto.OpControloSq0589"
outer-join="auto"
constrained="true"
property-ref="opFk"
column="op_fk"
/>
( ... )

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When I execute my test code I get:
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ERROR: Error parsing XML: XML InputStream(122)
org.xml.sax.SAXParseException: Attribute "property-ref" must be declared for element type "one-to-one".
( ... )

It's weird because the "property-ref" is really used for a "one-to-one" association in my mapping file!?

Is it a bug? Please help.

Thanks in advance.

property-ref is a 2.1 feature. The error refers to a lack into the DTD, the DTD must reference property-ref.

I'm using the DTD:
http://hibernate.sourceforge.net/hibern ... ng-2.0.dtd

In the following page:
http://www.hibernate.org/68.html

it says that the DTD is the same (2.1 and 2.0.3).

And I saw the DTD above and the one-to-one element has the attribute "property-ref".
So I'm confused. It exists in fact.

You're using hibernate 2.0.3 and Hibernate will start looking the DTD in the jar before looking for internet.

The DTD policy of Hibernate is not to update the DTD version if it's backward compatible. The site DTD is uptodate with hibernate 2.1 final.
Be sure to use your local DTD to have proper DTD checks.

You are right. In fact the DTD shiped with the jar doesn't have "property-ref" for the "one-to-one" element.

Thanks for the tip.