README.md

Java Lessons

1. Lesson #1 - How to write an annotation for your JUnit5 tests and to use application.properties from Spring environment

2. Lesson #2 - How to log every request in Spring/SpringBoot web application

Snippets

1. Flexible Caffeine Cache Manager - How to separate different cache configurations into one application using Caffeine cache
2. Big decimal example
3. 'At least one group' Validator - JavaX validator to check whether only one field is specified