Dynamic « DAO « JPA Q&A

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1. Find concrete class using a dynamic expression (where a Class instance is passed to a DAO)    stackoverflow.com

I have this method signature: 

public int nrOfEntities(Class<? extends MailConfirmation> clazz, User user, String email)
I would like nrOfEntities to return the number of entities that:
  • Are of the concrete class clazz
  • Have a matching ...

2. Generic DAO - Could Java Dynamic Proxies be used?    forum.hibernate.org