Upgrading from Spring Boot 3.3 to 3.4: A Comprehensive Guide with Examples

Upgrading your Spring Boot application from version 3.3 to 3.4 introduces a plethora of new features, enhancements, and some critical changes. This guide aims to help you navigate these updates smoothly, providing detailed explanations and practical examples.

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Introduction

Spring Boot 3.4 brings significant improvements to application performance, observability, and developer experience. However, some changes require attention during the upgrade to ensure your application continues to function correctly. This guide provides an in-depth look at the most impactful changes, complete with code examples to facilitate a smooth transition.

Key Changes and Enhancements

RestClient and RestTemplate

What’s New?

• Auto-Configuration Support: RestClient and RestTemplate now support auto-configuration with various HTTP clients, such as Apache HTTP Components, Jetty Client, Reactor Netty's HttpClient, and the JDK's HttpClient.