Markus articles - 26 total
Dynamic Role-Based Access in Quarkus: Fine-Grained Security Without Redeploys
Hardcoding @RolesAllowed("manager") works for demos. It crumbles when requirements change weekly....
SFTP Meets PostgreSQL: Building a Smart File Upload System with Quarkus Dev Services
Most file-handling tutorials stop at REST endpoints and a local filesystem. That’s fine for...
Charting Twain: Building a Character Interaction Graph with Quarkus, OpenNLP, and a local Ollama Model
What if you could analyze a classic novel not just for words, but for relationships? In this...
Counting Millions of Things with Kilobytes
How do you count millions of unique users, sessions, or IPs using just a few kilobytes of memory,...
Build a Full-Stack Todo App with Quarkus, Panache, and Qute
Every developer has written a Todo app at some point. But with Quarkus, building one becomes more...
Stop Leaking Stack Traces: Mastering RFC 7807 Error Handling in Quarkus
Insecure error handling is one of the fastest ways to lose user trust, or worse, leak sensitive...
Build Your First AI Agent in Java: Quarkus, Langchain4j, and the A2A SDK
AI Agents aren't just hype. They're the foundation for the next generation of autonomous and...
Master AI-Powered DNS Lookups with Quarkus and Langchain4j
What if you could ask your Java app, “What are the MX records for gmail.com?” and get a precise,...
Mastering AI Tool-Calling with Java: Build Your Own Dungeon Master with Quarkus and LangChain4j
Welcome, traveler. You are about to embark on a journey through code and imagination, where your...
Groan-Worthy Greatness: Build an AI Dad Joke Generator with Java, Quarkus, and Langchain4j
Welcome to the one tutorial guaranteed to make your code and your coworkers groan. In this...
From Black Box to Blueprint: Tracing Every LLM Decision with Quarkus
In a world of agentic AI, knowing what your model did isn't enough. You need to know why. This is...
JVM Inspector with AI: Build a Smart Diagnostic Tool with Quarkus, LangChain4j, and Dev Services
Most observability tools speak machine. But what if you could ask your system a human question...
Taming Unstructured Data: From PDFs to JSON with Quarkus and Docling
Enterprise data rarely arrives in clean, structured formats. In the real world, valuable...
Mastering Reasoning with Code: Chain of Thought Pipelines in Java
Large Language Models are impressive, but unpredictable. Give them a task and they might produce...
Build an AI-Powered Document Assistant with Quarkus and LangChain4j
Enterprise Java developers know the pain: slow startup times, high memory usage, and complex AI...
Building a Real-Time File Upload Progress Tracker with Quarkus and SSE
Uploading large files is a common task in modern web apps, but doing it well? That’s another story....
Composite Keys in Quarkus: Building Smarter IDs with Hibernate and Panache
Most Java developers default to using surrogate keys (or auto-generated id fields) for their...
The Distributed Dragon Forge: A Hands-On OpenTelemetry Adventure with Quarkus
Most observability tutorials start with something uninspiring: a monolith logging its own method...
One Does Not Simply Build Memes with Java: Unless It’s Quarkus
What do you get when you combine a legendary Java framework with a legendary meme? A REST API that...
Level Up Your Java: A Developer's Guide to Agentic AI
(Originally Published on My Substack) Hey Java devs! 👋 Have you been hearing the buzz around...
Spring Cleaning: Tidy Your Java Code & Maybe Your Framework? ✨
Original posted on Substack Alright folks, you feel it right? That urge to open the metaphorical...
A Lean Decision-Making Approach for Choosing Java Frameworks with Architecture Decision Records
Technology changes fast. But there's still business value that needs to be created and software...
Your First Open Source Contribution: A Beginner's Guide
Open source software thrives on community involvement. Contributing to these projects is a great way...
Quarkus: A Lean and Agile Foundation for Enterprise Generative AI
While Spring Boot, with the advent of Spring AI, is making significant strides in the Generative AI...
Use local AI Models easily for Development and Experimentation
Podman Desktop AI Lab is a recently announced extension for Podman Desktop, aimed at simplifying the...
Use LLMs in Java. An example with Merlinite, Quarkus, and Podman Desktop AI Lab
Incorporating AI Models into Your Java Applications This guide dives into how Java developers can...