Duke’s Forest Case Study Example - The Java EE 6 Tutorial: Advanced Topics - page 519

is also used as a base for the entities consumed and produced by the web services through
JAXB. Each entity has validation rules based on business requirements, specified using
Bean Validation.
FIGURE 27-3. Duke's Forest Database Tables and their Relationships
The database schema contains eight tables:
• PERSON , which has a one-to-many relationship with PERSON_GROUPS and
CUSTOMER_ORDER
• GROUPS , which has a one-to-many relationship with PERSON_GROUPS
• PERSON_GROUPS , which has a many-to-one relationship with PERSON and
GROUPS (it is the join table between those two tables)