Do you know that too? You are working on Project A, which is still running on Java 11 LTS, while at the same time you are developing a new feature for Project B, which is already based on the current Java 21. And then there is this legacy system that, for some unknown reason, requires Java 8.

If you’ve been programming Java for a while, you probably use List, Set, and Map every day. But let’s be honest: most developers barely scratch the surface of what the Java Collections API can really do.

Hello everyone,

In modern, microservices-oriented architectures, we want to keep components as independent as possible. When service A performs an action (e.g. registers a user), service B should respond to it (e.g. send a welcome email) without A needing to know from B directly.