Howdy !
The Auction Application is a JPA sample application used in Oracle's course:
Building Database Driven Applications with JPA. It's used for demonstration purposes.
Unfortunately, it's available only for those who take this course, it's not available for free download.
The good news is that Enthuware has similar
Toy Application for JPA application which demonstrates different kinds of JPA 2.0 aspects (mappings, relationships, inheritance, collections, query builder, etc.). The ToyAppForJPA was written for Hibernate persistence provider (and
Maven ?), I needed to make some minor modifications to run it on EclipseLink persistence provider in NetBeans 7.1. But it worked pretty well - the RDBMS was used Derby
Java DB (bundled with JDK since Java SE 6).
Best regards,
MZ