@vaadin

The Open-Source UI framework for building web apps 100% in Java.

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vaadin.com
Joined April 2009
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  • Followers8.5K
2KMedia
How many Swing users fit on one server? With 4 GB of memory and a real app (JOSM): SwingBridge 38 users, Webswing 10. One shared JVM instead of one per user. vaadin.com/blog/how-many-swi…
Blog cover: How many Swing users fit on one server?

ALT Blog cover: How many Swing users fit on one server?

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Under the hood of Vaadin 25.3: Flow's client engine moved from GWT-compiled Java to native TypeScript. 107 modules, ~19k lines, 700+ browser tests, real source maps. Your Java APIs don't change. vaadin.com/blog/vaadin-25-3-…
Card: GWT to TypeScript, 107 modules, about 19k lines, 700+ browser tests

ALT Card: GWT to TypeScript, 107 modules, about 19k lines, 700+ browser tests

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Where does full-stack Java go next? Vaadin Create 2026, Barcelona, Oct 27–28: 2 days, 3 tracks, 20+ speakers including Josh Long. Trailer: youtube.com/watch?v=bfydXyAe… Tickets: vaadin.com/vaadin-create-202…
Video thumbnail: Where full-stack Java goes next, Vaadin Create 2026, Barcelona

ALT Video thumbnail: Where full-stack Java goes next, Vaadin Create 2026, Barcelona

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Vaadin 25.3 browserless tests now follow user rules: if a user can't do it in the browser, the test can't either. Still JVM-fast, no browser needed. Plus seven new component testers. vaadin.com/blog/vaadin-25-3-…
Card: If a user can't do it in the browser, the test can't either. Browserless tests in Vaadin 25.3

ALT Card: If a user can't do it in the browser, the test can't either. Browserless tests in Vaadin 25.3

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Theming tip for Vaadin 25.3: pair Copilot's new Aura theme editor with the all-components view. Every component in your project, custom ones included, with all variants. Change a property, see it everywhere. youtube.com/watch?v=WnkI6xA9…
Copilot's all-components view, showing every component in a project with its variants

ALT Copilot's all-components view, showing every component in a project with its variants

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Modernizing a Swing app? SwingBridge 1.3 adds memory optimizations, 24- and 32-bit adaptive color and high-DPI support for Retina and 4K displays. Release walkthrough: youtube.com/watch?v=WnkI6xA9…
Card: SwingBridge 1.3, your Swing app sharper in the browser, with three improvements listed

ALT Card: SwingBridge 1.3, your Swing app sharper in the browser, with three improvements listed

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How do you know whether your docs and tools actually help AI agents? You measure it. VaadinBench: real Vaadin tasks, graded by tests the agents never see. Benchmark and results are public. github.com/vaadin/vaadinbenc…
Blog cover: VaadinBench, which AI coding tools work with Vaadin?

ALT Blog cover: VaadinBench, which AI coding tools work with Vaadin?

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In Veracode's 2026 tests, Java had the lowest security pass rate for AI-generated code of any language: 30%. It was also the only language clearly improving. Setup matters more than the assistant. Six habits for Java teams: vaadin.com/blog/ai-coding-fo…
Feature image titled 'AI coding for Java teams: speed without losing control'. A prompt leads into a dashed box labeled 'AI control gap', followed by a card of Vaadin Java code.

ALT Feature image titled 'AI coding for Java teams: speed without losing control'. A prompt leads into a dashed box labeled 'AI control gap', followed by a card of Vaadin Java code.

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Migrating a 53-screen JSF 2 app to Vaadin 25 with 7 AI agents in parallel. Best lesson: tests were green while 13 forms rendered blank. Now no view closes until someone clicks through it in a browser. vaadin.com/blog/jsf-2-to-vaa…
Blog cover: Building a pipeline that migrates a JSF 2 application to Vaadin 25

ALT Blog cover: Building a pipeline that migrates a JSF 2 application to Vaadin 25

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Picking an AI coding tool for a Java team? We compared 8 (Claude Code, Cursor, GitHub Copilot, Junie, Codex, Antigravity, Kiro, Moderne) on codebase context, IDE fit, MCP support, enterprise readiness and price. vaadin.com/blog/the-best-ai-…
Workflow diagram: an AI agent uses the Vaadin MCP server and Agent Skills to write Java code, which the compiler and tests check before shipping, looping back to fix failures.

ALT Workflow diagram: an AI agent uses the Vaadin MCP server and Agent Skills to write Java code, which the compiler and tests check before shipping, looping back to fix failures.

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New in Vaadin 25.3: Switch, Table (replacing NativeTable) and Breadcrumbs out of preview. Plus Date Picker can disable specific dates, and ComboBox gets partial matching. vaadin.com/blog/vaadin-25-3-…
Two Switch components labelled Two-factor authentication, one on and one off

ALT Two Switch components labelled Two-factor authentication, one on and one off

A Table with a caption, grouped column headers and a totals row

ALT A Table with a caption, grouped column headers and a totals row

Date Picker overlay with Thursdays disabled and individual dates highlighted

ALT Date Picker overlay with Thursdays disabled and individual dates highlighted

Combo Box with partial text typed and the first matching item highlighted

ALT Combo Box with partial text typed and the first matching item highlighted

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The Vaadin MCP server now gives your agent the full Java API for any class, and runs as a self-hosted Docker image, even air-gapped. Plus a Directory MCP server for finding compatible add-ons. youtube.com/watch?v=WnkI6xA9…
Card: Vaadin MCP server, context your coding agent can rely on, with three capabilities listed

ALT Card: Vaadin MCP server, context your coding agent can rely on, with three capabilities listed

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Upgrading to Vaadin 25.3? SSO Kit, Collaboration Kit and AppSec Kit are deprecated ahead of Vaadin 26. Spring Security and shared signals replace them, with migration guides. Check the upgrade guide first: vaadin.com/docs/latest/upgra…
Card: Before you upgrade to Vaadin 25.3, a three-item checklist

ALT Card: Before you upgrade to Vaadin 25.3, a three-item checklist

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AI that fills in your forms is useful. AI you can audit is better. Vaadin 25.3's AI form filler shows a confidence level for every field, where in the document each value came from, and lets you undo any single field. vaadin.com/blog/vaadin-25-3-…
AI form filler: an invoice on the left with the source passages it used highlighted, and the filled form on the right

ALT AI form filler: an invoice on the left with the source passages it used highlighted, and the filled form on the right

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A Vaadin Grid with 1,000,000 rows: from ~8 seconds to under 1. Lazy loading, sorting and filtering in the database, and one data provider shared by Grid and ComboBox. Code along in 37 minutes: youtube.com/watch?v=KswDxz-j…
Video thumbnail: Vaadin Grid Lazy Loading, Backend Sorting and Filtering

ALT Video thumbnail: Vaadin Grid Lazy Loading, Backend Sorting and Filtering

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Observability Kit 5 is rebuilt from scratch: no Java agent, one dependency in Spring Boot, plugs into Prometheus, Datadog or Grafana. Plus Insights: route, component, click and failing line of code, structured for your AI agent. observability-cases.fly.dev
Card: Observability without the Java agent, with the observability-kit-starter Maven dependency

ALT Card: Observability without the Java agent, with the observability-kit-starter Maven dependency

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Port a Swing app to Vaadin by swapping imports: javax.swing.* → vaadinx.swing.* In a 65-file inventory app, 97.3% of lines stayed byte-identical. 40+ Swing components, blocking modal dialogs included. vaadin.com/blog/swingbridge-…
Blog cover: SwingBridge Emulators, Swing to Vaadin by swapping imports

ALT Blog cover: SwingBridge Emulators, Swing to Vaadin by swapping imports

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Did your coding agent's change actually reach the running app? Vaadin 25.3's Dev Loop CLI (preview) tells it: is the app running, hot-swap or restart, and is each change live. Try the tutorial: vaadin.com/docs/latest/build…
Video thumbnail: Vaadin 25.3, faster, more autonomous coding agents for Java UIs

ALT Video thumbnail: Vaadin 25.3, faster, more autonomous coding agents for Java UIs

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Record a macro, schedule it, or let an AI agent run it, all through your existing Vaadin UI and Spring Security rules. In one test, Draiv (alpha) used about a sixth of the input tokens and half the time of a browser-driving agent. vaadin.com/blog/driving-vaad…
Blog cover: Driving Vaadin apps with macros, automation, and AI

ALT Blog cover: Driving Vaadin apps with macros, automation, and AI

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Vaadin 25.3 is out, one of our largest feature releases yet. Dev Loop for AI agents, a self-hosted MCP server, Observability Kit 5 without a Java agent, auditable AI form filling, a new Switch component and more. Read the full release post: vaadin.com/blog/vaadin-25-3-… #java #ai
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