All you need to do is create your two classes, and in the encapsulating class, declare a list of instances of the encapsulated class. So, a Team has Players, right? Well, you could create a Team class that has a List of Players:
Of course, you'd need the Player class as well.
Then, it's just a matter of writing normal
Java code that uses the Hibernate and JPA annotated classes!
It's all that easy!
Here's the full Hibernate3 tutorial if you're interested:
Doing One to Many and Many To One Associations with Hibernate and JPA Annotations -Cameron McKenzie