Creating a mapped superclass
In this recipe, we'll look at how to create an entity which inherits a mapped superclass. The fields of a mapped superclass are stored into the table to which the inheriting entity is mapped. The mapped superclass itself is not mapped to any table. In this recipe, we'll create the Flight entity, which extends the AuditFields class. The AuditFields class represents a mapped superclass; the fields of AuditFields are stored into the table to which the Flight entity is mapped.
The following figure shows the relationship between the Flight entity and the AuditFields mapped superclass:
Getting ready
Exit the Roo shell and delete the contents of the C:\roo-cookbook\ch03-recipes directory.
Start the Roo shell from the C:\roo-cookbook\ch03-recipes directory.
Execute the ch03_jpa_setup.roo script which creates the flight-app Roo project, sets up Hibernate as persistence provider, and configures MySQL as the database for the application. If you are using a different database...
