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errors when clients use JPA without jdo.jar or JDO without jpa.jar. Give a more succinct warning when some product derivations are uninstantiable, with more detailed information available via the ProductDerivations class's main(). git-svn-id: https://svn.apache.org/repos/asf/incubator/openjpa/trunk@463829 13f79535-47bb-0310-9956-ffa450edef68