Creating Spring Boot Microservices

Get an intermediate-level overview on how to start creating microservices using the power of the Spring Boot 3 platform.

Introduction

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

1. Spring Framework Introduction

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

2. 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

3. 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

4. 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

5. 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

6. Best Practices

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

7. Dockerized Microservices and Databases

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

8. 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

9. 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