Description of the bug

I do have a problem with Subthemes. I do have the following project setup:

• core
• basic
• customer

The customer project depends on the basic project and the basic project depends on the core project. Each project has a theme. In the theme.json of the customer project I added the parent:

{
  "parent": "basic-theme"
}

In the basic project the core theme is added:

{
  "parent": "core-theme"
}

If there are no Npm Packages, the "core-theme" gets loaded when I start the customer project. But if there is a NpmPackage added, the "core-theme" does not get loaded.

The following project was the default project from start.vaadin.com.

I debugged it a bit and found out, that the application-theme-plugin does not load the core theme, because there is no theme.json in the folder

customer\frontend\generated\jar-resources\themes\core-theme

(not sure if that helps or is evem the error?)

Expected behavior

Parent theme of a parent theme should get loaded even with Npm-Packages.

There are 3 Buttons in the HelloWorldView (Route "" or "hello). Each button should have the color of the label. In this case the first button should be red, but since the theme is not loaded it has the default color.

If you remove the NpmPackage in the Application.java and compile again, it works as expected. (you might need to clear the browser cache)

Versions

Vaadin / Flow version: 24.2.2

Java version: 21

Spring Boot 3.1.5

How to start

the projects should be installed in the right order (core,basic,customer) with

mvn clean install -DskipTests -Pproduction

Alternatively in the win/ folder the install.cmd should do the trick (you can specify the java version in the entsampled setenv.cmd)

After all projects are build you can start the customer project with the win/run_server.cmd