Prefer output dir for hot deployment of resources

[brunolmfg]

The original resources without Maven properties resolution were provided by Static Handler for src/main/resources/META-INF/resources files when running in dev mode. The strategy used for hot deployment doesn't consider the resources filtering. So the interpolation of Maven properties wasn't processed.

Resolves #15303

[brunolmfg]

That solution has a side effect in config editor of dev mode console. Failed tests in DevConsoleConfigEditorTest and DevConsoleConfigEditorBodyHandlerTest when editing config.

[brunolmfg]

I've turned to include the first classesPath in RuntimeUpdatesProcessor#getClassesDir() instead resourcesPath. And StaticResourcesHotReplacementSetup will consider and prefer the HotReplacementContext#getClassesDir().

[gsmet]

@stuartwdouglas probably something for you to look at.

[stuartwdouglas]

This won't help if the resource is modified though, as dev mode will copy the file without interpolation. On the face of it it appears ok but it is only a partial solution to the issue.

[brunolmfg]

It's true. Using a IDE the changes were copied with interpolation and dev mode doesn't detect any change. But using a usual text editor the dev mode detect changes and copy the source file without interpolation. To resolve the later situation will need to call ClassLoaderCompiler firing the "compilation" with a CompilationProvider for filtered resources. Is it correct?

Is ok merging that partial solution?

[stuartwdouglas]

I think it is better than the current situation, so I am ok with merging.

[brunolmfg]

@gsmet will it be necessary to rebase? Is it possible to be merged into 1.12 or only for the next minor? 😄

[gsmet]

I think it's a bit too risky to be backported so it will be in 1.13.

[brunolmfg]

I totally agree. And I'm thinking about a set of changes over static resources. I've opened #15320 for provide customization of index page, but there are other improvements very useful. In a future moment I could invest a effort cataloging them.

Thank you @gsmet and @stuartwdouglas!