Johan Haleby

loopndroll. Keep Codex running forever

build-your-own-x. Master programming by recreating your favorite technologies from scratch.

tirith. Terminal security for developers and AI agents. Intercepts homograph URLs, pipe-to-shell, ANSI injection, obfuscated payloads, data exfiltration, and malicious AI skills/configs before they execute.

adk-java. An open-source, code-first Java toolkit for building, evaluating, and deploying sophisticated AI agents with flexibility and control.

yazi. 💥 Blazing fast terminal file manager written in Rust, based on async I/O.

stove. Stove: The easiest way of writing e2e/component tests for your JVM back-end app with Kotlin

mock-oauth2-server. Mock OAuth2/OpenID Connect server for JVM tests and Docker Compose. No security workarounds needed.

dcb-eventstore. Implementation of the Dynamic Consistency Boundary pattern described by Sara Pellegrini

bypass-mdm. Bypass MDM Setup for MacOS, up to MacOS Tahoe 26.3

occurrent. Unintrusive Event Sourcing Library for the JVM

mastermind. A deliberate practice exercise

evolutionary-architecture-by-example. Navigate the complex landscape of .NET software architecture with our step-by-step, story-like guide. Unpack the interplay between modular monoliths, microservices, domain-driven design, and various architectural patterns. Go beyond the one-size-fits-all solutions and understand how to blend these approaches based on your unique needs.

fmodel. Functional, Algebraic and Reactive domain modeling with Kotlin (Multiplatform)

kata-catalog. My list of code katas

awesome-katas. A curated list of code katas

blog-example-code. Example code for my blog entries

openai-kotlin. OpenAI API client for Kotlin with multiplatform and coroutines capabilities.

crnk-framework. JSON API library for Java

junit5-formatted-source. Format-driven parameterized tests for JUnit 5

act. Executable state charts, property based testing and more.

socketbroker. Java Socket library supporting SOCKS and HTTP proxy servers with authentication

trading. 💱 Trading application written in Scala 3 that showcases an Event-Driven Architecture (EDA) and Functional Programming (FP)

mock-in-bean. Surgically Inject Mockito Mock/Spy in Spring Beans

hotel-demo. Hotel booking application - Demo - Axon Framework & Axon Server

fmodel-demos. Functional Domain Modeling - Demos - https://fraktalio.com/fmodel/

htmx-demo. Very simple demonstration of the use of htmx with Spring Boot and Thymeleaf.

excalidraw. Virtual whiteboard for sketching hand-drawn like diagrams

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

sql-to-mongo-db-query-converter. sql-to-mongo-db-query-converter

playingwithprojections-haskell. Playing with Projections - Haskell

ddd-starter-modelling-process. If you're new to DDD and not sure where to start, this process will guide you step-by-step

WebRTC-Experiment. WebRTC, WebRTC and WebRTC. Everything here is all about WebRTC!!

awesome-reasonml. A collection of awesome things regarding Reason/OCaml ecosystem.

mackup. Backup and keep your application settings in sync.

jonotin. Small library for Google cloud Pub/Sub queue with Clojure.

buckpal. An example approach for implementing a Clean/Hexagonal Architecture

jattach. JVM Dynamic Attach utility

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

event-storming-cheatsheet. Short cheat sheet for preparing and facilitating event storming workshops

tech-radar. Visualizing our technology choices

pure-cqrs-example. An implementation of a CQRS/ES system using functional FP in scala.

siren-java. Java Library and Annotation Processor for Building Siren Web APIs

elm-spa-example. A Single Page Application written in Elm

kystrix. Kystrix is a small Kotlin DSL over Hystrix

json-graphql-server. Get a full fake GraphQL API with zero coding in less than 30 seconds.

event-driven-spring-boot. Example Application to demo various flavours of handling domain events in Spring Boot

scotty-blog. Haskell

spring-cloud-stream-rabbit-sample. Kotlin

arrow. The perfect companion for your Kotlin journey - Inspired by functional, data-oriented and concurrent programming

Nightlight. An embedded editor for Clojure

what-happens-when. An attempt to answer the age old interview question "What happens when you type google.com into your browser and press enter?"

kubeval. Validate your Kubernetes configuration files, supports multiple Kubernetes versions

awaitility. Awaitility is a small Java DSL for synchronizing asynchronous operations

kubetail. Bash script to tail Kubernetes logs from multiple pods at the same time

Pushraven. A simple Java library to interface with Firebase Cloud Messaging (FCM) API. Pushraven allows you to push notifications to clients in very few lines of code.

clj-lens. Nested data structure querying and updating

curl-logger. Logs HTTP requests sent by REST-assured as CURL commands.

architecture. Repository of Architecture Decision Records

microservice-websites. Building consumer-facing websites with multiple teams

schema-viz. Plumatic Schema visualization using Graphviz.

processing-logs-using-dataflow. Processing Logs at Scale using Cloud Dataflow

oden. The Oden Programming Language (NO LONGER IN ACTIVE DEVELOPMENT)

talk-transcripts. Transcripts of Clojure-related talks

spring-boot-container-demo. Groovy

re-frame. A ClojureScript framework for building user interfaces, leveraging React

compose2kube. Convert docker-compose service files to Kubernetes objects.

rock-paper-scissors-in-java. The game rock-paper-scissors implemented using Event Sourcing in Java

eventstore2. A framework for building event sourced Java applications

event-sourcing-examples. Example code for my building and deploying microservices with event sourcing, CQRS and Docker presentation

accurest. Accurest - Consumer Driven Contracts verifier for Java. Moved to:

embedded-jetty-jsp. Example of Embedded Jetty with JSP support

docker-ecosystem-survey. An incomplete survey of the Docker ecosystem.

gtd. Sample app for Getting Things Done with Facebook Flux and ReactJS

docker-gen. Generate files from docker container meta-data

compojure-api. Sweet web apis with Compojure & Swagger

http-api-design. HTTP API design guide extracted from work on the Heroku Platform API

spring-hateoas. Spring HATEOAS - Library to support implementing representations for hyper-text driven REST web services.

jOOL. jOOλ - The Missing Parts in Java 8 jOOλ improves the JDK libraries in areas where the Expert Group's focus was elsewhere. It adds tuple support, function support, and a lot of additional functionality around sequential Streams. The JDK 8's main efforts (default methods, lambdas, and the Stream API) were focused around maintaining backwards compatibility and implementing a functional API for parallelism.

powermock. PowerMock is a Java framework that allows you to unit test code normally regarded as untestable.

meangirls. Convergent Replicated Data Types

actor-lab. A small lab on how to use actors

crash-lab. A library for testing stability of web apps

Hystrix. Hystrix is a latency and fault tolerance library designed to isolate points of access to remote systems, services and 3rd party libraries, stop cascading failure and enable resilience in complex distributed systems where failure is inevitable.

assertj. Fluent testing assertions for Java and the JVM

ice. AWS Usage Tool

rest-assured. Java DSL for easy testing of REST services

IDDD_Samples. These are the sample Bounded Contexts from the book "Implementing Domain-Driven Design" by Vaughn Vernon: http://vaughnvernon.co/?page_id=168

Java-Chronicle. Java Indexed Record Chronicle

rock-paper-scissors-in-java. The game rock-paper-scissors implemented using Event Sourcing in Java

rest-assured-lab. Labs for REST Assured Java API