ReadMeFeed / Community knowledge
Real questions. Useful conversations. Find the people who know your stack.
Frameworks & web · #vaadin
Goal: Enable developers to view JDBC connection‑pool health directly inside a Vaadin Flow application without relying on external monitoring tools. Constraint: Vaadin Flow does not create or manage its own pool; it delegates to the container or Spring Boot’s HikariCP‑based DataSource, and the framework currently offers no dedicated API or UI component to sur
Resource Management in Lazy Loading Vaadin Flow uses DataProvider callbacks, specifically fetchFromBackEnd , to handle lazy loading for the Grid component. These callbacks execute on the UI thread to retrieve data pages from the database based on the current view. Concurrency and Pool Capacity In environments with high concurrent user volume, the way databas
Goal Determine whether to rely on Vaadin Flow’s server‑side WebSocket push with automatic fallback to long‑polling, or to configure long‑polling as the primary transport when network latency is unpredictable and servlet container WebSocket support is limited. Constraints and Uncertainty Vaadin Flow 14+ uses WebSocket push by default when @Push is present, fa
Vaadin Dialog overlays are expected to be fully disposed after the dialog is closed, yet repeated open/close cycles can cause client‑side memory growth. The goal is to verify whether the overlay component retains a reference to the dialog after closure, which may lead to a memory leak in Chrome DevTools heap snapshots. Testing must be performed on a supporte
Vaadin Flow Route Title Configuration: Missing Precedence Rule Between @Route.pageTitle and getPageTitle() The goal is to define a deterministic rule for the browser <title> when a Vaadin Flow component declares both a @Route(pageTitle = "…") annotation and overrides getPageTitle() . Current documentation does not state which source wins, and anecdotal
Goal Determine if Vaadin Flow re‑executes UI initialization listeners such as @PostConstruct methods or UIInitListener implementations after a session is passivated, replicated to a backup node, and restored following a failover. Constraints and uncertainty The UI class and all its fields must be serializable for HTTP session replication to succeed. Session
Vaadin applications utilize a route-based navigation system where views annotated with @Route are accessible by default. To prevent accidental public access, developers typically integrate Spring Security or use the BeforeEnterEvent to intercept navigation and verify authentication before the target view is rendered. There is a concern regarding the precise
The goal is to define a reliable verification approach for recovered UI state after backup restoration in a Vaadin Flow application that uses custom components and Spring-managed entities. UI serialization persists the component tree as JSON. Custom components must handle transient fields to avoid data loss during restoration. Backend data restoration depend
The goal is to determine whether the default 1000‑row cap on a Vaadin Grid’s virtual scroll can be increased in a Vaadin 23 application. The Grid component exposes a setPageLengthLimit(int) method, but the documentation does not clarify whether this method truly overrides the hard limit or if an internal maximum still applies. Constraints include the fact th