prepare-frontend is automatically used with build-frontend and should be omitted.

clean-frontend can be used when maintaining multiple versions of Vaadin, e.g., in different hotfix branches. Although it comes with longer build times, this will clean up any incompatible frontend dependency artifacts and fetch them anew.

mvn clean package and mvn clean install will create a production build and omit any development dependencies that are declared optional. (Note that this only applies for spring projects.)

Start the main application in your IDE

Use mvn spring-boot:run from the command line

Terminal: Run java -jar target/<application>.jar.

IntelliJ: Start the generated JAR file from IntelliJ.

Server console: On start, the application will write to the console in which mode it was started.

Browser console: In production mode, you should see less log entries. In particular, you should not see any logs regarding server round trips and how long each took.