This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Hibernate has <component> XML element which allows you define mapping for embeddable objects whose properties are mapped in the same table as the owning entity's table. See Embedded objects (aka components)