Johannes Rabauer

Spec: humans. Plan: robots. @asm0dey.site skims the spec in a couple of minutes. The plan is "a very long document which I almost never read." Which of the two do you read? Full live session: https://youtu.be/mufzjT87pmI

Bad graph, bad GraphRAG. If the data is duplicated and related in nonsensical ways, that's just bad. So how do you get a good graph out of plain text? @neo4j.com https://youtu.be/fWOptSc7wpk #GraphRAG

New date for the Jakarta Agentic AI session with Luís Neto from @azulsystems.bsky.social: Wed Oct 28, 8pm CET (it was Oct 12). Same plan, a CFP reviewer as one CDI bean on Payara Micro with a local Ollama model. https://youtube.com/live/bm4BRjW0pUs

We’re hiring a Java developer who already works with Claude Code. The job: let the agent draft OpenRewrite recipes, review them closely, run them against real customer code. Java upgrades, javax → jakarta, CVE fixes. Weiden or remote ☕️🇩🇪👨‍💻 xdev.software/jobs #Java #OpenRewrite

Funny AI moment: the agent built my GraphRAG app, it ran nicely, and it never touched @neo4j.com. In-memory store instead. How long would it take you to notice? https://youtu.be/fWOptSc7wpk

Same question, two pipelines. GraphRAG retrieved 15 context items, vector search fewer, and the vector answer came out more detailed. When does more context make an answer less specific? https://youtu.be/fWOptSc7wpk #GraphRAG

Tonight, 20:30 CEST: @asm0dey.site and I build a @maven.apache.org plugin live. Design first, then the spec, then AI agents write the code. Out comes one interactive HTML page of your dependency graph. https://youtube.com/live/mufzjT87pmI

I thought GraphRAG was just RAG on a graph database. Then I built an app that replays every retrieval step on @neo4j.com. The more interesting thing for me were the communities. What are they? https://youtu.be/fWOptSc7wpk #GraphRAG

@filiphric.com asked his coding agent for a deliberately buggy demo app. With the Qodo plugin on, it refused until he switched it off. Good sign or just annoying? https://youtu.be/ljntagQDc5Q

4 meetings booked, 5 bookings saved. @filiphric.com's coding agent wrote an off-by-one loop, and Qodo's review caught it. Would yours, in a 500-line PR? https://youtu.be/ljntagQDc5Q

Thursday 8pm CEST, live: @asm0dey.site and I build a @maven.apache.org plugin that writes your dependency graph as one interactive HTML page. Pasha's order: design, then spec, then the AI agents code. https://youtube.com/live/mufzjT87pmI

Should Claude Code review Claude Code's code? @filiphric.com says no, they may share a blind spot. In my projects a fresh session with the same model still finds plenty. Who's right? https://youtu.be/ljntagQDc5Q

@filiphric.com wanted a deliberately buggy Java demo app. With the Qodo plugin on, his coding agent refused to write it until he switched the plugin off. That moment says a lot about what Qodo is. My recap: https://rabauer.dev/en/blog/qodo-is-not-a-pr-bot/

Your coding agent loaded the rules file. Did it actually follow it? @filiphric.com: loaded doesn't mean enforced, and auto-compact can make a rule quietly disappear. How do you check? https://youtu.be/ljntagQDc5Q

100 villagers in Java, zero LLMs. Each choice is one pass of Laya, a 421M classifier by Nandakishor Mukkunnoth. Click anyone to see the sentence it got. One bad phrase and all 100 chose "relax". Town: johannesrabauer.github.io/laya-pixel-t...

If an AI writes your code, is a second AI reviewing it just a yes-man? @filiphric.com from Qodo and I find out live, no Qodo knowledge needed. Thu Oct 8, 8pm CEST: youtube.com/live/ljntagQ...

@mdelapenya.bsky.social built biomelab, an open-source dashboard for running several AI coding agents in parallel without losing track of which is doing what. I assumed each agent got its own isolated sandbox. Wrong, and the real reason is worth knowing. rabauer.dev/en/blog/biom...

I used to think GraphRAG was just RAG with @neo4j.com swapped in for the vector store. Simple, right? Wrong, and I only found out by building something to check. Coming live Oct 1: youtube.com/live/fWOptSc...

Code reviews that build trust instead of frustration 🔍 At IT-Tage in Frankfurt, Johannes Rabauer @rabauer.dev shares what he has seen in Java teams working on established codebases, and how they improved quality without burning people out. Get your ticket for #ITTage now. #Java #CodeReview

Quick reminder: Don't mess up selecting the right Tom!

I've run a dozen AI coding tools live on stream. Copilot, Junie, IBM Bob, Antigravity, Kiro. All cloud-hosted. I still haven't found a local model that's actually good at generating code. Who's cracked this? What's your stack?

Premiere: Mein erstes Mal auf dem JUG Saxony Day, und ich bin gleich zweimal auf der Bühne. Vormittags geht's um Code-Reviews, die eskalieren. Abends um Dev-Stories, die schiefgingen, und was am Ende wirklich geholfen hat. Fr, 25.09. Radebeul: Salon Lößnitz & Hamburg 2. #JSD2026

Everyone keeps asking which model I use. Wrong question. Months of streaming live AI-assisted coding taught me the model is rarely the bottleneck. A rules file the AI actually reads, small iterations, and letting tests judge the diff beat any model swap. Workflow > model. What's yours?

3 AI coding agents. 1 Java project. Everyone assumes that's chaos. @mdelapenya.bsky.social says otherwise. We put it to the test live, Thu Sep 17, 8pm CEST. youtube.com/watch?v=9-Wx...

Had a great time with @rabauer.dev ! We went over time, and eventually got the app working, it's a pretty complicated app that would have probably taken weeks before AI! Check out the repo at github.com/bbenz/202608...

📖 Neuer Beitrag: Die Jagd nach jedem einzelnen CVE ist sinnlos. Eine bessere Lösung ist ein Schwachstellenmanagementsystem aufzubauen, das sich auf Hardened Images, Build-Provenienz, und Richtlinien für die Behebung von Schwachstellen stützt. javapro.io/de/wie-man-c...

You’ve seen plenty of #JCON2026 sessions lately. Now it’s time to start creating the next ones. 🎬 The Call for Papers for #JCON EUROPE 2027 is officially OPEN! 📅 April 26–29, 2027 📍 Cinedom, Cologne ⏰ Submit by October 16 ➡️ sessionize.com/jcon-europe-... #JCON2027 #CFP #Java #Conference

Everyone "knows" Java is too slow to start for serverless. Building a real Quarkus (@quarkus.io) app and deploying it to Cloud Run live, scale-to-zero on, to find out if that's still true. youtube.com/live/5PKJI3W...

Java plus a real AI model, built with @langchain4j.dev, plus deploying to @azure.microsoft.com. Sounds like a whole day gone before lunch. Today @bbenz.bsky.social and I find out live, no prep hidden off-screen. youtube.com/live/TI7_Wz5... #Java #AI #AzureAIFoundry

Here's a thing about AI "agents" in Java: if your LLM ever picked a tool, ran it, and reacted to the result, you already built one. So what's #LangGraph4j actually adding? Bartolomeo Sorrentino, who built it, joins live tomorrow to find out. youtube.com/live/bLN1iiT...

Join @lizziesiegle.com and me on a live-coding session about @entire.io! It will be fun and there will be swag to give away! :) youtube.com/live/Z-8V8xg...

Using AI for a code review sounds unsafe, right? Join @nnennahacks.com's and my session on thursday 8PM CEST and see how #QodoAI handles this: youtube.com/live/9OyKQbC... We'll see how we can use all the advantages of AI while still maintaining control of our code. 💪

Our next #JCON2026 session is live: 'Ten Angry #Comments Later: #Stories About #Code Reviews, Teams, and Yesterday’s Code' with Johannes Rabauer You open a #pullrequest. Ten comments later, you’re wondering whether the code … Grab your coffee and hit play: youtu.be/N5hGP4qQ30I

Last weeks coding was amazing! I learned so much about (AI) skills and (AI) workflows! If you are only slightly interested in AI coding, please check out my summary of the Bmad-Method! Great stuff: rabauer.dev/en/blog/bmad...

Took a while, but i finally got the verification: "GitHub Certified: Agentic AI Developer" 🎉 I liked to work with @github.com Actions before, but adding #AI to that workflow just makes it even more powerful!

How can i build a reliable workflow with #Java and @langchain4j.dev? Let's find out with the help of Les Jackson and @temporal.io! Join us tomorrow at 8PM CEST: youtube.com/live/saM_XnO...

Here is the new #JavaFX #LinksOfTheWeek, published on www.jfx-central.com/links. Thanks to @johanvos.bsky.social @gluonhq.bsky.social @azulsystems.bsky.social @frankdelporte.be @rabauer.dev Happy reading, and have a lovely #Java weekend!

Pretty excited to learn about the Bmad Method today from the man himself: Brian Madison. Join us if you have questions or want to comment. Or view it later, if you are busy ;) youtube.com/live/Gki9fAl... #Java #AI

We had another great 🛠️ DCN meetup this week. Stefan Böhringer gave us an introduction to Event Sourcing and shared his experience with the topic. The discussion and questions afterward showed how much interest there still is in fundamental software architecture topics.

Honestly kind of impressed by how far IBM Bob has come. Last time we torched 40 Bobcoins on a chess game, this time we built a whole habit tracker for just 8. If you don't have 2 hours for the stream, I wrote up the short version with all the learnings. rabauer.dev/en/blog/ibm-...

Going live to build a @quarkus.io + Qute personal finance tracker with Brian "BMad" Madison, creator of the BMad Method on friday. No script, no editing out the messy parts, just seeing how far structured AI planning actually gets you. youtube.com/live/Gki9fAl... #Java

If you are interested in playing around with midi devices and files, check out melodymatrix.rocks. It's free and quite fun :) @frankdelporte.be built this with his son, which is such a great idea on it's own! #JavaFX #MIDI #Piano

Final preparations for my live-coding session about coding some java with Maximilian Jesch and IBMs Bob. Join us tomorrow at 8pm CEST for some educational fun 😅🤓 -> youtube.com/live/_7rzl1_...

I wanted to summarize things that i learned so far on coding with #AI and will share that in a live-coding session. This will be different, with a longer theory part with a few slides, and then we'll get into a #Java project. Join me and learn something or correct me: youtube.com/live/pMAdjgY...

I had a great time learning about Ingos definition of a software factory in my last live-coding session. As usual, if the session is too much for you to watch, you can read this short article about it: rabauer.dev/en/blog/soft... (Yet i still recommend watching the whole video 😉)