Java responsive web app layout: side navigation in webforJ

The quickest way to build a responsive Java web app layout in webforJ is AppLayout for the shell, AppNav for the side navigation, and ColumnsLayout or FlexLayout for the content. AppLayout gives you a fixed header and footer plus a drawer that turns into a popover on narrow screens. Everything is plain Java and every view is a route.
This guide builds the whole shell in one pass: the drawer and its breakpoint, navigation linked to routes, a content grid that changes column count with the viewport, and what happens on a phone.





