This article is an exploration of composition and inheritance relationships with Hibernate and Spring. The article begins with boilerplate project setup using Maven2 and presents individual examples of one-to-one, one-to-many and many-to-many relationships, as well as one way to map inheritance to a database schema. JUnit tests emphasize the interesting features of these relationships. By the end of the tutorial, we will have a framework and the tools for building more complex domains from these simple models.