Building Robust API Clients with RestClient in Spring Boot 3.X

In this story, we’ll explore how to use the RestClient class in Spring Boot 3 to perform GET, POST, PUT, and DELETE operations against REST APIs.

If you are not a Medium member, then click here to read for free.

· Prerequisites
· Overview
∘ Why RestClient Was Introduced in Spring Boot 3
∘ Choosing the Right REST Client in Spring Boot 3
· Real-World Example: CRUD on Products using FakeStoreAPI in Spring Boot 3
∘ Configure the RestClient Bean
∘ Product DTO (model)
∘ Using the RestClient: Service Layer - ProductService
∘ Controller
∘ Error handling patterns
∘ Test API Calls
· Conclusion
· References

Prerequisites

This is the list of all the prerequisites:

• Spring Boot 3
• Maven 3.6.3 or later
• Java 21
• IntelliJ IDEA, Visual Studio Code, or another IDE
• Postman / insomnia or any other API testing tool.