In this blog, I will show you how to quickly create a full-stack app using an extremely powerful, versatile, popular, and entirely free software stack consisting of Flutter, Spring Boot, Oracle Database with Spatial (SQL, JSON, and blockchain), and OpenStreetMap. All of the source is of course available here.
As a use case, I will create a multi-player game based on geocaching. (Fun fact, there are now more than 3.1 million active geocaches in 196 different countries and even space.)