Support ResourceLoader delegation from ApplicationResourceLoader

[zmkpr0]

Is there a reason that JksSslStoreBundle creates a new instance of ApplicationResourceLoader instead of using an existing DefaultResourceLoader?

https://github.com/spring-projects/spring-boot/blob/main/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/ssl/jks/JksSslStoreBundle.java

Resource resource = new ApplicationResourceLoader().getResource(location);

Creating a new ApplicationResourceLoader instance means that for example S3ProtocolResolver from Spring Cloud AWS that works by registering itself using ResourceLoaderAware is ignored and only those declared in spring.factories get picked.

I know there are a few ways to work around this, but it's not that obvious that not all ProtocolResolvers work when declaring a bundle.

[philwebb]

I'm currently looking at #42468 and would like a way to have auto-configured SSL Bundles work with the classloader from the application context ResourceLoader. It seems like supporting delegation would be possible once that is fixed.