Master Java Web Services and REST API with Spring Boot- Step 5: Defining a JPA Entity-User

The video tutorial guides viewers through creating a simple Java entity class named 'User'. It covers setting up a project, defining attributes like ID and name, and generating methods such as getters, setters, and constructors. The tutorial also explains how to annotate the class for database persistence using JPA annotations, including marking the ID as a primary key with a generated value. Finally, it introduces the concept of using an entity manager to store and retrieve entities from a database.

What is the purpose of the default constructor in the user class, and how does it relate to JPA?

Describe the role of the entity manager in storing and retrieving entities from the database.