关于JDO和CMP的一段对话:

Do you support JDO and what are your plans for JDO?

JBOSS: we have been supporting JDO for quite a while via Castor and other means. But, JDO has not taken the persistence crown. EJB/CMP is much more powerful than JDO. JBoss is working to decouple the CMP engine from JBoss so that it can be used independently of EJB.
ORACLE: The Oracle app server does not supprt JDO, but our new TopLink product is very close, and may enable Oracle to support JDO in the future.
BEA: does not support JDO and says that JDO is not compelling vs. CMP 2.0.
IBM: Websphere 4 and 5 do not support JDO. IBM is still trying to figure out what to do about JDO.