Frontend resources import with multimodule Maven projects

[flefebure]

We are migrating a Vaadin7/SpringBoot multimodule Gradle project to Flow 14.
Waiting for a compatible Gradle Plugin, I'm training with a Maven Multimodule project.

The subject is the handling of frontend resources (js, css..) located in modules.

For training, I tried to convert https://github.com/vaadin/flow-spring-examples to a multimodule layout
The result is https://github.com/flefebure/flow-spring-examples

The results of my tests are :
In production mode :

• I needed to put the resources both in ui-module/src/main/resources/ and ui-module/src/main/resources/META-INF/resources/frontend

• I needed to change the import from @jsmodule("./src/example-template.js") to @jsmodule("src/example-template.js")

• Then I can build and run successfully the bootJar with

mvn -PproductionMode clean package
java  ui-bootstrap/target/ui-bootstrap-1.0.0-SNAPSHOT.jar

In dev-mode : (main-class run in intellij Idea)

• The dev-server can't locate the ui-module frontend resources and the module template can't be imported
• This is maybe be related to In multi-module projects, other module resources are not visited by TaskCopyFrontendFiles #6242, that has been fixed, but in a feature-branch
• if we have built the project in productionMode beforehand, the run is successfull, but the dev-server is in fact not started.

Are there work in progress at this level ?

Hope this helps

[pleku]

Fixed by #6379