SpringBoot ConfigDataLocationResolvers and PropertySourceLoaders are loaded using a potentially different class loader

ConfigDataLocationResolver implementations are loaded using the resource loader's ClassLoader

https://github.com/spring-projects/spring-boot/blob/5e57f1bb7b145db735fb2e6634f52896907db0ce/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/config/ConfigDataEnvironment.java#L157-L161

One of these implementations, StandardConfigDataLocationResolver, then uses its class's own class loader to load PropertySourceLoader implementations:

https://github.com/spring-projects/spring-boot/blob/5e57f1bb7b145db735fb2e6634f52896907db0ce/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/config/StandardConfigDataLocationResolver.java#L86-L93

For consistency, it should use the ResourceLoader that's passed into its constructor instead.