Delve into creating REST APIs with Spring Framework, integrating databases with JPA, implementing Aspect-Oriented Programming, unit testing, and documenting with Springfox, and monitoring with Spring Boot Actuator.

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In this advanced-level course, you’ll learn to create REST APIs using the Spring Framework. The course gives a detailed experience in designing, implementing, and documenting REST APIs with end-to-end features like database integration and monitoring.

Firstly, you'll set up a Spring Boot project and create fully-functional REST APIs to manage your to-do lists. Secondly, you’ll learn database integration using Spring Data JPA and consume APIs using various tools such as cURL, Postman, and the Swagger UI. Thirdly, you'll learn Aspect-Oriented Programming (AOP) in Spring and Unit test the APIs using Spring Framework. Lastly, you’ll learn to document APIs using Springfox and Spring REST Docs and monitor them using the Spring Boot Actuator. 

By the end of this course, you'll be confident to design, implement, and document REST APIs end-to-end using the Spring Framework, including advanced topics like AOP, Unit Testing, and Monitoring.

REST APIs with Spring, JPA, and Springfox

A **repository** is a class that provides storage, retrieval, and search behavior over a collection of objects that are usually persisted in the database.

Furthermore, simply by declaring the class with the `@Repository` annotation, we can define a repository in the Spring application, enabling autodetection through classpath scanning.

The **JPA repository** is the `Repository` interface provided by the Spring Data JPA over Java Persistence API (JPA). It provides a complete abstraction over the data access layer in a project.

First, the repository interfaces offer various abstract methods for storage, retrieval, and search features. 
Then, Spring provides proxy implementations for the defined interfaces at the runtime. 

This reduces a lot of the boilerplate code required for creating an efficient data access layer such as the implementation and utilization of an entity manager.


The `CrudRepository` and `PagingAndSortingRepository` repositories are handy repository interfaces available in the generic Spring Data framework. However, Spring Data JPA also provides the JPA-specific `JpaRepository`.

Let’s explore these repositories a bit more  before creating them:

* The `CrudRepository` provides CRUD features through methods like *`save`*, *`findOne`*, *`findAll`*, *`count`*, *`exists`*, and *`delete`*.

* The `PagingAndSortingRepository` extends the `CrudRepository` and provides pagination and sorting features over it.

* The `JpaRepository` contains features of the `PagingAndSortingRepository` and `CrudRepository`, and extends it with JPA-related features like flushing and deleting in batches.

Let’s explore JPA repositories and learn how to use them to add persistence to the todo application.

Introduction to Spring Boot

Develop REST APIs

Database Integration With Spring Data JPA

REST APIs With Spring Data REST

Aspect Oriented Programming

Spring Framework Testing

Consuming APIs

API Documentation With Swagger

API Documentation Using Spring REST Docs

Spring Boot Actuator

Wrapping Up

Setup JPA Repositories

What is a repository?

What is a JPA repository?