97 Things Every Java Programmer Should Know
Kevlin Henney & Trisha Gee
grep Pocket Reference
John Bambenek & Agnieszka Klus
99 Bottles of OOP (Milk, JS)
Sandi Metz & Katrina Owen & TJ Stankus
Hands-On Server-Side Web Development with Swift
Angus Yeung
A Microservice Architecture with Spring Boot and Spring Cloud
Baeldung
Do JSON with Jackson
Persistence with Spring
Get the Most out of HTTP Client
Move on to JUnit 5
Build Your API with Spring