I'm not sure we need to add grails-bom as a platform to testAndDevelopmentOnly as it is a Spring configuration and we are adding the bom to the Spring Dependency Management Plugin in GrailsGradlePlugin. It seems to work without it.

I was glad to remove grails-bom as a platform on testAndDevelopmentOnly. It appeared to be required when we switched from implementation to developmentOnly (https://github.com/apache/grails-core/actions/workflows/gradle.yml?query=branch%3Awebjars-developmentOnly)

* What went wrong:
Execution failed for task ':grails-test-examples-namespaces:bootJar'.
> Could not resolve all files for configuration ':grails-test-examples-namespaces:testAndDevelopmentOnly'.
   > Could not find org.webjars.npm:jquery:.
     Required by:
         project :grails-test-examples-namespaces

That's interesting. Gradle seems to be able to resolve the webjar versions in apps generated by Forge, without the platform added.

Aha, this is why the platform is needed in the functional test apps:

Based on

Given we use project() in these test projects, it appears we need to keep the dependency management plugin disabled and add grails-bom as a platform for testAndDevelopmentOnly.

This is different than generated apps, but we are moving in this direction: #14142