Using Spring Data JPA for persistence

This section will introduce JPA and how to use Spring Data JPA repositories to provide Create, Retrieve, Update, and Delete (CRUD) operations on JPA easily.

 

Class diagram for the domain model

Since the domain model is the most important component of an application, this section will go over designing it before we go any further. The following is the simple class diagram for this web service:

There is only one main domain model, as shown in the preceding diagram. This is explained as follows:

User: This is the main domain model, which will store user details such as username, password, email, and id.

Implementation of the domain model using JPA annotations

This section will explain the details of how to configure and use Spring Data JPA with an embedded database with the domain model designed in the previous section.

Setting up dependencies and the configuration class

Initially, before implementing the domain model, the dependencies and configuration classes...