Where to store `UI`-object scoped state in a Vaadin 14 app?

Question

Context (web app)

To store state available to our entire Vaadin app, we can get and set \"Attribute\" on the VaadinContext object that represents our entire Vaadin

Answer 1

In Vaadin Flow there is ComponentUtil helper class which has methods to store data with components and UI.

See the pair of ComponentUtil.setData methods, one taking a Class as key, the other taking a String as key, just like the getAttribute/setAttribute methods found on VaadinContext & VaadinSession.