Seems not to support Vaadin 11. I assume 10 either. It's looking for com.va

Directory Stepper
1

Seems not to support Vaadin 11. I assume 10 either. It’s looking for com.vaadin.data.HasValue, com.vaadin.ui.Component, com.vaadin.ui.AbstractField

and complaints about: reason: varargs mismatch; org.vaadin.risto.stepper.IntStepper cannot be converted to com.vaadin.flow.component.Component

2

Vaadin 8 and 10 are not compatible by default, so a com.vaadin.ui package is always a sign of Vaadin 8 (or earlier), while Vaadin 10+ components are located inside of com.vaadin.flow.

This means a Vaadin 8 addon cannot be used in Vaadin 10 (except inside of MPR).