{ 4Comprehension }

One of Vavr’s users hit a peculiar bug recently: a serialized map containing enum keys, deserialized in another process, appeared to hold the right entries but the map… just could not find them.

Daily Docker loop involves a bunch of operations used over and over again, and everything usually starts with docker ps.

A long time ago, when applying to one of the unicorns, they gave me a take-home exercise that I remember to this day.

If you maintain a Java library, you’ve probably felt the disconnect between supporting Java 8 and providing support for the Java Platform Module System.

Gatherers is the missing piece of the Stream API.

Using fakes in tests instead of mocks has great advantages – it enables behaviour verification, which enables a true TDD, where you start with capturing desired behaviour in tests.

Sometimes, bugs are obvious, trivial, and punch you right in the face.

The impedance mismatch between Project Reactor’s thread hopping and thread-local model is still hard to grasp for many teams – context propagation has consistently been a key part of every Project Reactor workshop I’ve delivered since… ~2016.

Your JVM application “broke” and stopped logging exception stack traces?

Converting a Java Stream into a List sounds trivial but can be surprising sometimes, especially when dealing with nulls and immutability.