A comprehensive Domain-Driven Design example with problem space strategic analysis and various tactical patterns.

An extremely easy way to perform background processing in Java. Backed by persistent storage. Open and free for commercial use.

Enhancing Java Stream API

Secure and speedy templates for Java and Kotlin.

Compare JSON in your Unit Tests

SequencePlugin for IntelliJ IDEA

Spring Boot Startup Report library generates an interactive Spring Boot application startup report that lets you understand what contributes to the application startup time and perhaps helps to opt…

Code katas for learning Spring® and Spring Boot.

A full featured, stand-alone, high-performance HTTP server and client written entirely in plain Java

Gang of Four patterns in Kotlin.

Decorates stack traces with source code snippets.

An example of an Architecture Guild repository

JVM related (Java, Groovy, Scala, Kotlin, etc) samples for the Raspberry PI, relying on PI4J. IoT and friends.

A collection of tiny helpers for building Spring applications

RIS Caselaw

Refactoring exercise where data layer and business layer are not clearly separated

A Java library to control remote switch units using a RC Transmitter (like this one: http://www.watterott.com/de/RF-Link-Sender-434MHz) connected to the Raspberry Pi.

List of questions and solutions to different problems presented during technical interviews