Strange router error

Could someone explain this error?

com.vaadin.flow.server.AmbiguousRouteConfigurationException: Navigation targets must have unique routes, found navigation targets ‘it.prismatdi.ui.graffiti_user.UserLayoutTab’ and ‘it.prismatdi.ui.graffiti_user.UserLayoutTab’ with the same route.

Are you using a Hotswap-enabled JDK?
http://hotswapagent.org/
https://github.com/TravaOpenJDK/trava-jdk-11-dcevm

The message appears when we recompile UI classes with routes. After recompilation, two (three, four, …) loaded classes of the same type are present in the VM. Vaadin then thinks you have different UIs with identical routes.

Just restart or ignore :slight_smile: