Marc Englund

After a few months of intensive work with AI agents on Java projects, I can say: Vaadin is currently the best web framework for Java developers. Two reasons make the difference. 𝟭) 𝗕𝗿𝗼𝘄𝘀𝗲𝗿𝗹𝗲𝘀𝘀 𝗧𝗲𝘀𝘁𝗶𝗻𝗴 Karibu Testing and the official UIUnitTest let me test complete views without a browser. No WebDriver, no flakiness, no 30 seconds wait per run. Tests run in milliseconds. This sounds like a pure comfort argument, but it is much more. When I let an AI agent work on a Vaadin project, the test suite runs after every change. The agent sees right away if it broke something and fixes it. With a slow E2E suite, this does not happen. The agent gets the feedback too late, and quality drops. The Test Trophy model fits very well here: the focus is on integration tests through the whole view, not on isolated unit tests of single components. 𝟮) 𝗔𝗜 𝗦𝗸𝗶𝗹𝗹𝘀 𝗮𝗻𝗱 𝗠𝗖𝗣 𝗮𝗿𝗲 𝘁𝗵𝗲𝗿𝗲 Vaadin has released an official Claude Code plugin: github.com/vaadin/claude-… It comes with eleven curated skills (Theming, Layouts, Forms, Signals, Views, Testing and more) plus an integrated Vaadin MCP server for live documentation lookups. The effect in daily work: without MCP, the agent guesses from its training data. That data is months old and does not know the current Vaadin 25 APIs. The result: hallucinated methods, outdated patterns, code that does not compile. With MCP, Claude queries the official documentation live. With the skills, the agent gets curated best practice knowledge on top, which is not part of the general training data. The difference in code quality is clear. 𝗧𝗵𝗲 𝗯𝗶𝗴𝗴𝗲𝗿 𝗽𝗶𝗰𝘁𝘂𝗿𝗲 I believe that frameworks will no longer be measured only by their Developer Experience, but also by their Agent Experience. Short feedback loops, curated knowledge via MCP and skills, consistent patterns: these are the new quality criteria. Vaadin already meets these points today. Java instead of JavaScript, server-side, fast tests, official AI tools. Exactly the combination that matters in the enterprise Java space. This aligns strongly with what I teach in my SDD Workshop and in the AIUP methodology: anyone working with AI agents needs the right tooling around them, otherwise you fight against the agent instead of with it. #Vaadin #Java #SpringBoot #AI #ClaudeCode

Restarting your http MCP server? ✔️Codex CLI reconnects (JIT connect, I think) ✔️ Claude Code started reconnecting "recently" ❌ Claude Desktop via mcp-remote does not reconnect Other findings/corrections? Is there a cross-agent feature matrix somewhere?

Did you know @vaadin 24.8 now offers a super-simple way to share feedback? 🚀 Give the Beta a spin and tell us what you think (how meta)!

Watch this if you're even slightly interested in how AI powered apps are built! @marcushellberg does a great job showing the most important bits and illustrating what they actually do in an approachable manner – even if you're not a @java @springboot @vaadin type of person.

Hey @vs_marketplace, was support replaced by an AI, or what's going on? - We were already verified back in April. - I resubmitted and replied last week; no response. - What does "by date based on publisher date 10/04/2024" exactly? - Does "by" mean "after" in your language?

Join @leifastrand @marcenglund and me for a @vaadin 24.4 demo on Tue (8am PT / 6pm EET). Bring your questions! youtube.com/watch?v=J1HH4U…

📣 SAVE THE DATE! Vaadin Create conference returns on 29-30 October 2024 in Frankfurt, Germany! 🎉 Join us for two days of innovation, learning, and networking with the #Vaadin community. Stay tuned for agenda and registration details. We hope to see you!

@simas_ch Occasionally. The autocomplete is powerful, but it’s different enough so I try for a while, then decide to focus on / learn it more later. But it supports light/dark properly, which Terminal does not 🤯

Do you use warp.dev?

@langchain4j @vaadin Vaadin Copilot is included when running your project in dev mode, knows context, able modify, hotswap code. The AI combines LLM, RAG, pre- & post-processing, clever prompting, and project knowledge to get the job done – plus @langchain4j, of course.

@vaadin Very cool! Please tell us more, how does it work?

🎉 We're eager for you to try Vaadin Copilot, a new visual development tool and AI-powered code assistant now available in our 24.4 beta release on trial basis. It's optimized for Hilla/React views but Flow support is forthcoming. 🧠 Learn more here! -> bit.ly/3wJMSbP

“Dave is deaf, and Wally is blind. They witness a murder, but it was Dave who was looking at her, and Wally who was listening.” Multimodal often reminds me of “See No Evil, Hear No Evil” (1989, viewer discretion advised), but #OpenAI & #GoogleAI look really promising now!

Friday glitch or a new type of #MFAFatigue attack? 🤔 Safari asking for Touch ID, but I’m not in Safari, and I can’t find which page is asking. “Cancel” does nothing. Seriously: Touch ID should never be active w/o the target being visible and focused on screen.

A sneak peek of my next Java AI business app starter for analyzing review sentiments and drafting custom responses (using LangChain4j and Hilla). I want to create a handful of these starters: what are some other use cases for AI in business apps that you'd like to see?

I created a new app starter that lets you build a custom chat with docs (RAG) app in 4 simple steps. ☕ 100% #Java 🤖 @OpenAI or @ollama for a local LLM 🦌 🦜 @vaadin and @langchain4j Step 1: clone github.com/marcushellberg…

I spoke about “AI-powered business applications”, why it’s crazy right now but still the perfect time to act + some examples. As it’s about AI you should watch it right now, because tomorrow it might be outdated: youtu.be/J3wbPLrxpvE?fe…

In case you missed it, the recordings from Vaadin Create 2023 are now on YouTube: youtube.com/playlist?list=…

@marcushellberg @alejandro_du @vaadin @joonaslehtinen Yeah, it’s not very dependent on output format –that demo is made with Hilla, but when integrated into Start it outputs Vaadin Flow code. Why not have both 😉

@alejandro_du @vaadin @joonaslehtinen AFAIK, it'll be integrated into start.vaadin.com and work with either. @marcenglund worked on it, he might be able to confirm.

Is @Vaadin planning anything like this?github.com/SawyerHood/dra…

Hey @builderio, I just noticed all the #opensource links seem to go to the wrong place. Been there, done that, thought I'd let you know 😉

The subscription experience for @OpenAI must be one of the most confusing and buggy ones I know. Others tend to make it easy to keep paying. Maybe ChatGPT is coding its own site – that would explain a lot 😉

I mentioned to @LawrenceDCodes that I wanted to show him how I like to build @hillaframework apps and share some tips and tricks. We decided to live stream it on YT so everyone can join. What could go wrong? Join us on Tuesday and find out! 😄 youtube.com/watch?v=yPv7U3…

Today, #JugOberpfalz hosts @MattiTahvonen 🇫🇮! Matti is a long-time open-source veteran at @vaadin. In his talk about "You are not Google" he will explore if "best practices" from Big-Players like Google work for "normal companies." meetup.com/de-DE/jug-ober…