How to properly fix 'Resource was located via Classloader'

Hi,

We have multiple modules that share resources (mostly images and css) which are placed in their own module.
This module has a *.gwt.xml file but no entrypoint and everything compiles as it should, except we get these warnings:

[WARN] Resource '{}' was located via ClassLoader. As a result changes in that resource will not be reflected in per-file recompiles.
It should be registered via  <source /> or <resource /> entry in your .gwt.xml. In a future version of GWT, we will remove this fallback and your application will stop compiling

These resources are currently located in src/main/resources/images/.../*.png where it all works.
But if I move them (and update references to them) to src/main/java/package/where/resourcebundle/class/lives the warnings doesn't go away.

I've tried several other variants with or without absolute references, either it won't compile or it will still give the warnings.
I suspect this is due to our multi-module maven setup, but I find it unclear how to resolve, maybe copy resources to the projects that use them? But that isn't really maintainable (there are occasional changes to the styling).
I could possibly use maven to do that during the build, but I'm unsure if that would solve it.

With kind regards,
Maarten Daalder
ISAAC

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