title: JPA: How to have one-to-many relation of the same Entity type
body: <p>There's an Entity Class "A". Class A might have children of the same type "A". Also "A" should hold it's parent if it is a child.  </p>
  
  <p>Is this possible? If so how should I map the relations in the Entity class?
  ["A" has an id column.]</p>