spring boot
https://github.com/spring-projects/spring-boot/wiki/
https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-2.0-Migration-Guide
https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-Config-Data-Migration-Guide
https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-3.0-Migration-Guide
spring
https://github.com/spring-projects/spring-framework/wiki/Spring-Framework-Versions
https://github.com/spring-projects/spring-framework/wiki/Upgrading-to-Spring-Framework-4.x
https://github.com/spring-projects/spring-framework/wiki/Upgrading-to-Spring-Framework-5.x
https://github.com/spring-projects/spring-framework/wiki/Upgrading-to-Spring-Framework-6.x