http://caktus.github.io/developer-documentation/rds.html

http://www.nurkiewicz.com/2013/08/optional-in-java-8-cheat-sheet.html https://www.mkyong.com/java8/java-8-optional-in-depth/ https://dzone.com/articles/using-optional-correctly-is-not-optional

What is HiDPI Confused about HiDPI and Retina display? ― Understanding pixel density in the age of 4K

Introduction to Vert.x A gentle guide to asynchronous programming with Eclipse Vert.x for Java developers Vert.x – From zero to (micro)-hero Vert.x Core Manual

http://winterbe.com/posts/2014/03/16/java-8-tutorial/ http://shebang.pl/artykuly/java-8-przewodnik/

http://www.samouczekprogramisty.pl/kurs-programowania-java/

https://github.com/joelparkerhenderson/architecture_decision_record

https://www.infoq.com/articles/gdpr-for-software-devs

https://www.youtube.com/user/AmazonWebServices/videos

http://kestas.kuliukas.com/RainbowTables/