Breaking changes in Vaadin Flow 25 #7691
Description
Deprecated API
New Theming system
- Styles declared via @CssImport should be isolated within exported component flow#21272
- Load Aura theme by default in greenfield projects flow#21609
- Shadow DOM injection through components folder behind feature flag in V25 flow#21608
- WebComponentExporter should copy @font-face declarations to document body in V25 flow#21607
- Don’t load Lumo by default in V25 flow#21606
- Lumo class should be deprecated and just load stylesheets in V25 flow#21605
Frontend
Polymer -> Lit
Binder
- Adds isApplied feature for Binding flow#18540
- Binder.validate() no longer fails with "bean level validators have been configured but no bean is currently set" when in buffered mode flow#18121 / Binder.validate() fails with "bean level validators have been configured but no bean is currently set" when in buffered mode flow#18120
Dependencies
- chore(deps): bump org.hibernate.validator:hibernate-validator from 8.0.2.Final to 9.0.0.Final flow#21466
- Remove "construct-style-sheets-polyfill" in Vaadin 25 flow#21675
- chore: bump Spring Boot to 4.0.0-M1 flow#21951
Other
- Deprecate VaadinWebSecurity in Vaadin 24 and remove in Vaadin 25 flow#21410
- DeploymentConfiguration is retained in VaadinSession over session store-load cycle flow#18318
- Restrict VaadinWebSecurity to urlMapping flow#17624
- Deny access if Flow layout class has no annotation flow#21832
- Provide method to set Anchor's router-ignore flag. flow#17617 (comment) / feature: provide an API to make router ignore an anchor flow#17745 (comment)
- Set closeIdleSessions = true by default in Vaadin 25 flow#18153 (WebSocket connection vs http connection, push, let's ask on the forum what is an appropriate default in projects)
- Remove support for legacy frontend location in Vaadin 25.0 flow#22126
- Remove deprecated VaadinWebSecurity in Vaadin 25.0 flow#22129