In which release did Java Data Objects (JDO) first start allowing annotations as an alternative to XML?

My understanding is that the original incarnation of JDO required the use of XML files to describe the metadata but I see that the most recent version allows annotations.

Is this correct?

If so, when did annotations first become available in JDO as an alternative to XML开发者_Python百科?

From apaches JDO page:

The JDO 2.1 maintenance release provides support for JDK 1.5 features,including the use of annotations as a means of specifying mapping.

Most recent release is JDO 2.2, for 2.3 there's an early access release (again, this information is valid for apache JDO).