I opened up the feature flag and found this entry “com.vaadin.experimental.expressBuild=true” . Can you explain how it functions and if it bypasses the NPM build process? Thank you.
That kind of project includes a pre-built client bundle, a “chuck of JS” for the browser that it needs to communicate with your actual Vaadin application. As long as you only work with Java and don’t add any templates or add-ons that would need to be added to the client side bundle, no npm build is needed.
I’m afraid that will be ahead on your journey to get that fixed at some point, but go and enjoy your clean Java API for a while now 
@funny-manatee Would it be ok to have a video call at some point with somebody from the Vaadin team to look at the problem you had with Vaadin 23? Whether the issue was an actual bug or something to improve in the docs, we really should iron out these rough edges that exist for new users.
I am a 13 year old kid
Awesome, I’m glad you got it working!