title: JPA - Retrieve all Entity Classes
body: <p>I need to have a List of clasess that are Persistence Entities, I need have Entity Information, using Reflection API of JPA</p>
  
  <p>I have the EntityManager, But I do not know if that is the way.</p>
  
  <p>I want to do a generic logging for my Entities using a EntityListener. That works well, but I do not have the way to register the listener to all my entities.</p>