nice hibernate annotation tutorial
playing around with spring and hibernate I found this very good and practical tutorial which explained to me how to model many-to-many and one-to-many relationships with hibernate using annotations.
http://www.vaannila.com/hibernate/hibernate-tutorial/hibernate-tutorial.html
By the way. If you need a good starting point for exploring spring with hibernate and maven as build system check this page out. For my tests I slightly modified the example and added the maven exec plugin to actually run the project without having to worry about the dependency libraries. (i will add this part of the pom.xml some day to this post)
http://www.mkyong.com/spring/maven-spring-hibernate-annotation-mysql-example/