Start with the parts already written.

Pick the AppJars modules you need. You get a Maven project — Spring Boot, Vaadin 25 — with security, navigation, properties and theme already wired for those modules. Unzip, mvn spring-boot:run, done.

No license key needed. Every module runs in free mode with record and operation limits, which is enough to evaluate it.

Modules

Project

Group id Artifact id

Package name Application name

Java

Database

Include Dockerfile

Appearance

plain CSS variables

Primary color --lumo-primary-color

#f7501f

Font family Corner radius 8px Written to styles.css as custom properties. Edit them later in any text editor.