mini-spring

mini-spring is a simplified version of the Spring framework that helps you quickly familiarize yourself with Spring source code and master Spring's core principles. It extracts Spring's core logic with extremely simplified code while preserving Spring's core functionality. Maintained by DerekYRC on GitHub, where it has earned 6,368 stars from the community.

It's actively developed around mini-spring, spring, spring-boot, and is a solid reference for anyone building with these tools.