Creating Spring Boot Microservices

Course details

If you’re looking for a practical introduction on creating Spring Boot microservices, this course was designed just for you. Join instructor and software developer Mary Ellen Bowman as she provides a skills-based, intermediate-level overview on how to create microservices using the power of Spring Boot 3. Along the way, discover several other related technologies and frameworks such as Spring Data, Spring Data REST, Spring MVC, JUnit, Mockito, SpringBootTest, Docker, MongoDB, Spring Security, and Spring Cloud.

Concepts

Introduction

Build a RESTful Spring Boot microservice
What you should know
How to use the exercise files

Spring Framework Introduction

Inversion of control pattern
Spring ApplicationContext and Spring Beans
Spring autowiring annotations
Challenge
Solution

Create a Spring Boot Microservice

Introduction to Spring Initializr
Project setup
Build, deploy, and launch the microservice
Challenge - Add the Actuator dependency
Solution - Add the Actuator dependency

Leverage Spring-Data-JPA Repository Interfaces

The domain model
The persistence entities
Declare JPA repositories
Spring Data JPA repository dependency injection
Invoking the repositories
Introduction to Spring Data query methods
Challenge - Create a JPQL query method
Solution - Create a JPQL query method

Expose RESTful API's with Spring Data REST

Create APIs with Spring Data REST
Mapping API endpoints to repositories
Override default behavior
Swagger UI
Challenge - Modify the URL repository keyword
Solution - Modify the URL repository keyword

Expose RESTful API's with Spring MVC

Choosing the right framework
Declaring a new RestController
Create the RestController HTTP POST endpoint
Create the RestController HTTP GET endpoint
Create the RestController HTTP PUT, PATCH, and DELETE endpoints
Challenge - Add a PATCH endpoint
Solution - Add a PATCH endpoint

Best Practices

Global exception handling
Transaction rollback
Add a runtime logger
JUnit, Mockito, and SpringBootTest
API documentation

Dockerized Microservices and Databases

Why Docker
Dockerizing a microservice
Spring Boot Docker Compose
Database versioning with Flyway migrate

Create a RESTful MongoDB Microservice

Use cases for an image microservice
Challenge - Create the Spring Boot MongoDB project
Solution - Create the Spring Boot MongoDB project
Image file upload microservice
Spring Data MongoDB documents and repositories

Create an API Gateway with Spring Cloud

Use cases for an API gateway microservice
Routing to the JPA microservice
Routing to the MongoDB microservice
Add Spring Security to the gateway
Orchestrate with Docker Compose
Cleaning up the workspace

Conclusion

Next steps