Property Migration from Spring Boot 2.x to 3.x

A Step-by-Step Guide

Upgrading to Spring Boot 3.x unlocks Java 17 features, improved performance, and long-term support — but breaking changes in configuration properties can trip up even seasoned developers.

Non-members can read FULL story here: Property Migration from Spring Boot 2.x to 3.x

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This guide walks through migrating properties from Spring Boot 2.x to 3.x, covering deprecated settings, package relocations, and strategies to avoid common pitfalls.

Why Migrate to Spring Boot 3.x?

• Java 17 Baseline: Records, sealed classes, and enhanced APIs.
• Jakarta EE 9+: Package namespace changes (e.g., javax → jakarta).
• Deprecated Property Cleanup: Simplified configuration with updated properties.

1. Deprecated Properties with spring-boot-properties-migrator

The Properties Migrator tool spring-boot-properties-migrator flags deprecated properties and suggests replacements.

Step 1: Add the Dependency

Maven:

<dependency>
    <groupId>org.springframework.boot</groupId>…