business/src/main/java/jumpstart/business/domain/workout/README.html

The workout package contains entities that model many relationship types:

These classes are not really part of the application. They've been put here solely to give the business layer's persistence and exception handling a "workout" (ie. testing) without disrupting the data in the app's real entities.

To give them a workout, run the integration tests.

Problems? Eclipse might not be ready for junit - see Could not create task or type of type: junit.

The diagram above comes from the workout.zargo file which can be edited with the free tool ArgoUML.
You can launch ArgoUML by Java Web Start by clicking here. If it downloads without launching, just open the downloaded file. For details visit http://argouml.tigris.org.