vaadin/flow 25.2.0-beta1 on GitHub

Overview

Vaadin Flow 25.2 adds Java API for two browser features — Geolocation and Clipboard. The reactive signal API gains pageVisibilitySignal() and routerStateSignal(), and the release ships major dependency upgrades (Vite 8, Spring Boot 4.1.0, JUnit Jupiter 6.1).

Breaking Changes

Stop auto-running vaadinPrepareFrontend in development mode (Gradle)
Commit · Pull request · Issue
IDE-triggered Gradle builds no longer interfere with the running Vite dev server. The previous behavior can be restored with alwaysExecutePrepareFrontend = true.
Auto-apply context:// for @StyleSheet values
Commit · Pull request
Bare relative @StyleSheet hrefs now resolve relative to the context root instead of <base>, fixing 404s when vaadin.urlMapping is set to a non-root path. http(s)://, //, context://, base://, and /-prefixed values pass through unchanged.

New Features

Geolocation API

Add Geolocation API
Commit · Pull request

A new Geolocation utility wraps the browser Geolocation API. One-shot reads via getPosition(...), continuous tracking via watchPosition(...), all asynchronous and delivered on the UI thread. Results use sealed types (GeolocationPosition | GeolocationError, plus GeolocationPending for the watcher signal) for exhaustive pattern matching. Watches auto-stop on detach; stop() and resume() are explicit.

// One-shot read
Button locate = new Button("Use my location");
locate.addClickListener(e -> Geolocation.getPosition(
        pos -> showNearest(pos.coords().latitude(), pos.coords().longitude()),
        err -> showManualEntry()));

// Continuous tracking via reactive signal
GeolocationWatcher watcher = Geolocation.watchPosition(this);
Signal.effect(() -> {
    if (watcher.positionSignal().get() instanceof GeolocationPosition pos) {
        map.setCenter(pos.coords().longitude(), pos.coords().latitude());
    }
});

Split get() into onSuccess/onError callbacks
Commit · Pull request
Add addPositionListener to GeolocationWatcher
Commit · Pull request
Add GeolocationClient port for external test drivers
Commit · Pull request

Clipboard API

Add Clipboard text/html write API
Commit · Pull request

A new Clipboard entry point binds clipboard writes to a user gesture — the browser requires a fresh gesture for each write. Fluent chaining via Clipboard.onClick(component) produces a ClipboardBinding with fire-and-forget and observed (onCopied / onError) variants for plain text, HTML, field values, and multi-format ClipboardContent.

Button copy = new Button("Copy");

// Copy a literal value
Clipboard.onClick(copy).writeText("Hello, world");

// Copy the current value of a field, with success/error callbacks
Clipboard.onClick(copy).writeText(textField,
        copied -> Notification.show("Copied " + copied),
        err    -> Notification.show("Failed: " + err.message()));

// Multi-format: text + HTML
Clipboard.onClick(copy).write(ClipboardContent.create()
        .text("Hello")
        .html("<b>Hello</b>"));

Signals

Add pageVisibilitySignal() to Page for tracking browser tab visibility
Commit · Pull request
Read-only signal tracking whether the browser tab is visible+focused, visible+not-focused, or hidden.
Add UI router state signal
Commit · Pull request
UI.routerStateSignal() is a read-only Signal<RouterState> updated atomically alongside AfterNavigationEvent dispatch, so reactive consumers can observe the active route without registering an AfterNavigationListener.

Components and Events

Add getUI() to ComponentEvent
Commit · Pull request
No more event.getSource().getUI().ifPresent(...) boilerplate.
Support explicit UI in ComponentEvent constructor
Commit · Pull request
Add relevant API to allow drag and drop to a certain location
Commit · Pull request · Issue
Exposes clientX/clientY for all D&D events plus offsets of the target and start element to enable repositioning absolutely-positioned components on drop.
Introduce HasComponentsOfType for typed child containers
Commit · Pull request

`executeJs` and Client-Side JS

Add JsFunction value type for composable executeJs
Commit · Pull request
Add Element.addJsInitializer for scoped client-side JS lifecycle
Commit · Pull request

Data and Binding

Extract interface HierarchicalTreeData from TreeData
Commit · Pull request
Add overloaded fromInputStream method with fileNameOverride
Commit · Pull request

Build, Frontend, and Tooling

Upgrade Vite 7 to Vite 8
Commit · Pull request
Only install npm packages that have been available more than a day
Commit · Pull request
Default --min-release-age guards against supply-chain attacks via fresh releases.
BuildFrontend incremental build
Commit · Pull request · Issue
Add help goal for the Maven plugin
Commit · Pull request

Dependency Updates

Spring Boot updated to 4.1.0-RC1 (from 4.0.4)
Vite updated to 8.0.14 (from 7)
Node.js updated to 24.16.0 (from 24.14.1)
pnpm updated to 11.1.3 (from 11.0.4)
TypeScript updated to 6.0.3
TestBench updated to 10.2.0-beta1 (from 10.1)
JUnit Jupiter updated to 6.1.0 (from 6.0.3)
Jackson BOM updated to 3.1.3 (from 3.1.0)
Jetty updated to 12.1.9 (from 12.1.7)
Tailwind CSS updated to 4.2.2
Maven updated to 3.9.16 (from 3.9.14)
ASM updated to 9.10.1 (from 9.9.1)
Workbox bumped to current
Guava updated to 33.6.0-jre (from 33.5.0-jre)

vaadin/flow 25.2.0-beta1 Vaadin Flow 25.2.0-beta1 on GitHub