Is it possible to use the Vaadin Designer in a project that contains all java as a source? I realized that the designer works only if you use the full stack with JS
It depends a bit on how you want to think about it.
If your question is “Can I create Vaadin views using drag and drop in Designer and have it output Vaadin Java code?”, then the answer is no. Designer creates 1) a client-side JavaScript template (Lit or Polymer) and 2) a Java companion file to connect to that template.
You don’t necessarily need to need to write any JavaScript with this approach. Designer creates the template for you, and you interact with the Java companion file in your Java code. All your dynamic logic still happens in Java code and the template is essentially just a static file you include for the layout.
Thank you so much!