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If you’re using those pattern resolvers from a Gradle task that will not work via the classpath, as the task’s classpath is different than the classpath of what you are building. If you do need those files at build time you’ll need to reference the filesystem, not the classpath.

Ok it's the end of the work day and I've managed to do it by adding

file:

to the search path:

StandardEnvironment environment = new StandardEnvironment();
		PathMatchingResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver()
		for (final def resDir in sourceSets.main.getResources().srcDirs) {
			<http://project.logger.info|project.logger.info>("resDir: " + resDir.toString())
			String searchPath = Paths.get("file:" + resDir.toString(), "*.properties").toString()
			<http://project.logger.info|project.logger.info>("searchPath: " + searchPath)
			var resources = resourcePatternResolver.getResources(searchPath)
			for (final def res in resources) {
				<http://project.logger.info|project.logger.info>("Found resource " + res.filename)
			}
		}

This is a part of the task