Master Microservices with Spring Boot and Spring Cloud - Step 6 – Defining a Service to Manage the Entity – UserService

The video tutorial explains how to manage and save user entities to a database using an Entity Manager. It covers creating a User DAO Service, implementing a save method, and managing transactions with JPA. The tutorial also delves into the concept of persistence context and how it relates to entity tracking, emphasizing the importance of annotations like @Transactional and @PersistenceContext.

Describe the relationship between the entity manager and the persistence context.

How does the entity manager track changes to entities, and what happens to entities not managed by it?