Marcus Hellberg

Vaadin 25.3 shipped a ton of improvements for AI development, new components, and improved production observability. Check out the highlights! www.youtube.com/watch?v=WnkI...

Vaadin 25.3 improves the AI dev loop 🤖 🧠 MCP, skills & agent tools give coding agents up-to-date Vaadin context ⚡ Browserless tests let agents self-verify changes in milliseconds 🎨 Dev Loop makes UI tweaks visible instantly vaadin.com/docs/latest/...

This week, @boredabdel.bsky.social and I will find out. We'll build a Marathon Tracking App with: 🏃 GPX uploads 🗺️ OpenStreetMap 📈 Pace & elevation charts Using Antigravity CLI, Java, @Quarkus.io and @Vaadin.com Live. From scratch.

This is cool! There's now a Vaadin Aura theme preset gallery and theme builder: vaadin.github.io/web-compone... 🎉 The functionality will also be available in Vaadin Copilot shortly!

Vaadin 25.1 is out. Despite it's minor version bump, it comes loaded with some big features 🤩 Want to learn more and ask the team questions? Join our live stream in 15 minutes: www.youtube.com/watch?v=7gV...

Vaadin 25.1 is out! 🥳 Signals for reactive UI state management is the biggest update to our Java API since Vaadin 10 (but this time without breaking changes)! Other goodies: 🧑‍✈️ Copilot is free 🧪 Browserless UI testing is now free 🤖 New AI chat components vaadin.com/blog/vaadin...

In the upcoming Vaadin 25.1 release, browserless UI tests will be part of our free offering — Apache 2.0 licensed, just like the core framework. Test component state, events, routing, and UI logic directly inside the JVM. 🔗 Learn more on the blog: vaadin.com/blog/browser...

Ready for @Jfokus.se 2026, let’s goo!

Getting ready for our long Viking boat trip to @Jfokus.se with a proper Viking feast with the @vaadin.com gang, @starbuxman.joshlong.com, @gAmUssA.dev and @jbaru.ch 🥳

Last year was still busy with talks 💪 This year will be fewer talks as I'm focusing more on my new VP of Products role. But I'll still try to speak at a few key events a year 🤞

Vaadin 25.0 has landed! 🛬 ✨ New "Aura" theme & native CSS styling ☕ #Java 21 + Spring Boot 4 support 🚀 50% faster dev-mode startup 📦 Production-ready builds by default 📉 30% fewer dependencies Stop fighting the framework and start building. Check it out: vaadin.com/blog/vaadin-...

Some nice CSS simplifications in Vaadin 25: CSS is just CSS now, no need for any Vaadin specific theme config. New Aura theme. Automatic light/dark color scheme support.

Ever wondered how Quarkus builds its Dev UI? It’s Vaadin under the hood — and it’s actually great for building your own apps too. I wrote a full hands-on tutorial showing how to build a clean task manager UI using #Vaadin Flow + #Quarkus, all in pure #Java. Zero JavaScript drama. buff.ly/fcMQX9x

Today's #JCON Content Board Spotlight: Marcus Hellberg (Vaadin) Another #JavaChampion within our board who has over 20 years of experience in combining modern web technologies and #Java Whether hiking or exploring the next AI integration, he's fully committed. Join #JCON2026 2026.europe.jcon.one

🟦 Full-stack Web Apps, 100% Java with Marcus Hellberg (Vaadin). One language. One stack. As Odin intended ⚡ 👉 www.jfokus.se #Jfokus #DeveloperConference #Java #Vaadin #SpringBoot #Fullstack #WebDevelopment

Excited to speak at @Jfokus.se in February. Really love my Norse god avatar, I think it really highlights my luscious locks of hair 😂 www.jfokus.se/speakers.ht...

Today and tomorrow, I'm giving a Vaadin workshop for a client team in Greece. Vaadin is the easiest way to build great web applications in Java. Interested? I do Vaadin workshops worldwide, either online or, upon request, on-site for your team. martinelli.ch/training/vaa...

I created a new Vaadin AI starter that gives you a great starting point for building AI-powered apps. It includes: 💬 Streaming chat interface with Open AI 🔧 MCP support ☕ Java tool calling, local and REST → github.com/marcushellb...

Does anyone have a functioning example with @spring-ai.bsky.social and an HTTP MCP server? I've been going round in circles for an hour reading docs and examples, but still can't get it working 🤔

👾Vaadin Tutorial for Beginners: Beautiful UIs in Pure Java My new step-by-step tutorial on using @vaadin.com with #SpringBoot to build awesome UIs. Create a login page, filtered search, and update form in just 15 minutes. No HTML or JS needed! youtu.be/67oJxPRa3Mg

Are you a Vaadin developer using AI coding tools? Stop everything you're doing and add the new Vaadin MCP server to your setup before continuing! 🚀 mcp.vaadin.com/docs/

🥳🥳🥳 going to @Jfokus.se 2026!!

What an absolute treat to have my friend @starbuxman join Vaadin Create to do fast-paced, funny, and information-packed speedrun of all the exciting new features coming in Spring Boot 4 and @spring.io 7!

Vaadin Create 2025 is on!

So close… My flight from Orlando was late and I just caught a glimpse of my connection to Helsinki as it pulled out of the gate 😭

🍃 Real-World AI Patterns with Spring AI and Vaadin by @marcushellberg.dev / @thomasvitale.com @ Spring I/O 2025 ▶️ Video: youtu.be/cLWFu33kM3E 🔗 Slides: speakerdeck.com/thomasvitale... #springio25

When Claude goes down

Should we have a higher-level AI chat component in @vaadin.com that handles attachments, streaming, message history? You could register #SpringAI tools, advisors to it to expand its functionality. Full code for the demo below: new AiChat(OpenAiChatModel.class)

#Java fanatics come together! Pack your bags (and your #JVM) for #JCONUSA25 at #IBM #TechXchange in sunny Orlando, Florida (Oct 6–9)! Meet Java #Champions learn futuristic #tech and #geek out with fellow #devs 🌴☕ Discounted until the end of August 👉 usa.jcon.one/register #JCON #JCON2025

The @vaadin WTF summit is happening! (The only logical name for a workshop spanning Wednesday, Thursday, and Friday)

Regular registration is now open for @dev2next.bsky.social 2025 www.dev2next.com/4/news

My weekly AI news roundup by ChatGPT is exceptionally insightful this week

Ollama now has a UI as well! I know what I'll be doing today 🤩

BREAKING: @vaadin.com is a terrible framework (if you're trying to hack it).

🚀 Updated Vaadin MCP ✨ Combines semantic + keyword search with reranking 🛠️ MCP Tools Available: 📚 get_vaadin_primer - Vaadin fundamentals & best practices 🔍 search_vaadin_docs - Search Vaadin docs 📄 get_full_document - Complete doc retrieval 🏷️ get_vaadin_version - Latest stable version info

Vacation update 🏔️

TIL: in Norway they put the picture of the child whose liver they use to make the paté on the can.

Getting new Vaadin followers with @marcenglund.com

For the next 2 weeks I’ll be observing a different kind of #Vaadin 🤩

It's fair to say I'm not a big fan of Kubernetes ☸️

New blog post: How to consume and display Kafka messages in a reactive way using #SpringKafka, #SpringBoot, #React and #Hilla (by @vaadin.com) 👇 rene-wilby.de/en/blog/hill...

Don’t you just love that feeling when you dig around your old stuff and happen to find 100 trillion dollars?

“The summer is short. Most of it rains away.” - popular Swedish summer song Happy midsummer! ☀️

Judge me. I’ve been using Spring Boot with Vaadin to build a typical reactive web app, sort of thing React gets used for. I like it, it feels way more solid than flaky JS and bundling. Also does hotswap and is of course statically typed (as all good languages are). I’m smitten.

Vaadin 24.8 is out!

Looking forward to an amazing few days with 95 other Vaadiners in Berlin! #VaadinConnected2025

Hallo aus Berlin @jetbrains.com!

Did you know you can message @marcenglund.com right from the comfort of your Vaadin app devtools?

Interesting route choice for my Finnair HEL - BER flight, flying backwards through Poland 👀

Gelato run! 🍦🏃‍♂️💨