We have now configured the Spring application context and configured our web application to load it during startup. We will now implement CRUD functions for a simple entity. Our example application is used to view and manage contact information, and we can implement it by following these steps:
Create a domain model.
Create a repository for an entity.
Implement CRUD functions.
This chapter describes only such parts of our application that are required to understand how Spring Data JPA works.
The information content of each class
How we can create new objects by using the builder pattern (see also: Effective Java (Second Edition), Joshua Bloch, Addison-Wesley)
How we can update the information of an object