I've just run into this bug with the latest snapshot of 4.2.0. Not only is it unnecessary to specify a DiscriminatorValue for an abstract entity type, it's illegal to do so: "The DiscriminatorValue annotation can only be specified on a concrete entity class." (http://docs.oracle.com/javaee/6/api/javax/persistence/DiscriminatorValue.html)
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I've just run into this bug with the latest snapshot of 4.2.0. Not only is it unnecessary to specify a DiscriminatorValue for an abstract entity type, it's illegal to do so: "The DiscriminatorValue annotation can only be specified on a concrete entity class." (http://docs.oracle.com/javaee/6/api/javax/persistence/DiscriminatorValue.html)