Marcus Hellberg @marcushellberg
Applied AI Researcher, Speaker, DevRel expert. Java Champion. VP of AI Research @vaadin marcushellberg.dev California, USA Joined November 2008-
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@slava_imeshev Sorry, I realize the way I put that might have been misleading. What I meant is that we are not planning to deprecate Lumo. Whenever we’ve shipped a new theme, we’ve always kept the prevous one around for a good while to avoid people having to migrate their themes unnecessarily.
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This is cool! There's now a Vaadin Aura theme preset gallery and theme builder: vaadin.github.io/web-components… 🎉 The functionality will also be available in Vaadin Copilot shortly!
@slava_imeshev What are the things that make you want to stay on Lumo? The look and feel? The amount of customization you've built on top of it? We don't have plans on deprecating Lumo right now, I'm just interested in learning what you feel is better in Lumo than in Aura to help us improve it
@jonas_toma We don’t have any plans of deprecating it as of yet. We’ve eventually deprecated older themes in the past, so it’s likely to happen at some point in the future, but not in the near future.
Marcus Hellberg retweeted
A small experiment with Claude Code: Hotel room search, built twice. 1) Vaadin + Spring Boot + jOOQ + Testcontainers + PostgreSQL: 3 minutes. 2) Angular + Python + DynamoDB: about 5x longer. Why the gap? One stack is one language, one runtime, and a clear data model. The other is two ecosystems, two languages, and design decisions that need to be made up front. Choose your tech stack wisely.
Marcus Hellberg retweeted
Vaadin 25.1 brings reactive state management to Java—define your state once, and your UI stays in sync automatically. #Java #FullStack #WebDev #ReactiveProgramming
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: youtube.com/watch?v=7gVOjb…
@Sharat_Chander @vilojona @Oracle So sorry to hear that Shar, a big loss for the Java community. Wishing you the best of luck on finding your next adventure.
Cool side-benefit of using signals for state management in Vaadin: state is persisted across code hot swaps 🤩 (even scroll position is preserved!)
@kristoftaveirne Awesome! Glad to hear that 👏
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-25…
Ready for @Jfokus 2026, let’s goo!
Getting ready for our long Viking boat trip to @Jfokus with a proper Viking feast with the @vaadin gang, @starbuxman, @gAmUssA and @jbaruch 🥳
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 🤞
Marcus Hellberg retweeted
Many know that in its early days @vaadin was called Millstone. Did you know that for a split-second, it was called Enably?
Marcus Hellberg retweeted
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 Check it out: vaadin.com/blog/vaadin-25…
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.
Marcus Hellberg retweeted
Want to add a filter to a @vaadin Grid – in Java only? Drew shared a nice example showing how simple it can be. 🔗 Code: github.com/drewharvey/vaa… Great for dashboards & CRUD apps. #Vaadin #Java #WebDev
Marcus Hellberg retweeted
Today's #JCON Content Board Spotlight: @marcushellberg (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 is fully committed. Join #JCON2026 at 2026.europe.jcon.one
Marcus Hellberg retweeted
#LangChain4j 1.9.0 is out! 🎉 github.com/langchain4j/la…
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