Can I do this in JPA/Hibernate/Spring?

I have a simple hierarchy of objects which starts from the QuizResponse object.

First two of these are important:

UserPersonalityQuizResponse
   extends PersonalityQuizResponse开发者_如何学JAVA extends QuizResponse 
UserScoredQuizResponse
   extends ScoredQuizResponse extends QuizResponse 
...
AnonymousPersonalityQuizResponse
   extends PersonalityQuizResponse extends QuizResponse
AnonymousScoredQuizResponse
   extends ScoredQuizResponse extends QuizResponse 

These two, UserPersonalityQuizResponse and UserScoredQuizResponse, have a "user" property mapped on a different column for each.

Is it possible to make something in JPA/Hibernate, like an interface, UserResponse, to allow me to implement it and then to do this?

List<UserResponse> quizResponses = user.getUserQuizResponses()

Right now I need to make two queries to get this (on to retrieve userPersonalityQuizResponses and one for UserScoredQuizResponses).

Unfortunately the hierarchy of the QuizResponse class does not allow UserPersonalityQuizResponse and UserScoredQuizResponse to extend the same parent class.

You can do a HQL query like from QuizResponse q where q.class = UserScoredQuizResponse or q.class = UserPersonalityQuizResponse

See more details about polymorphic queries here: http://docs.jboss.org/hibernate/core/3.5/reference/en/html_single/#queryhql-polymorphism