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Action behavior

In Mateu, actions are not only about what happens in the backend.

They also define how the UI behaves when an action is executed.

This is controlled with @Action.

What @Action defines

  • validation
  • confirmation dialogs
  • execution mode
  • UI behavior
  • browser integration
  • SSE support
  • validation scope

Returning values

Actions can also influence navigation.

If a method returns a URI, Mateu navigates to that route.

@SneakyThrows
@Button
URI adminUser() {
  return new URI("/users/admin?version=2772");
}

Mental model

  • methods define what an action does
  • @Button / @Toolbar define where it appears
  • @Action defines how it behaves
  • returning URI can trigger navigation

👉 For the bigger picture, see Routing and parameters →