ResourceUtils.isUrl not considers classpath*: a valid protocol

[vkochnev]

Affects: \5.2.5

Discovered when trying to set spring.cloud.bootstrap.location to something like classpath*:/config/, but it didn't work because internally SpringBoot calls org.springframework.util.ResourceUtils#isUrl with supplied location and when receives false prepends it with file:. As a result it ends up with file:classpath*:/config/ in my case, which is obviously incorrect.

Expected result

ResourceUtils.isUrl("classpath*:/some/path/") == true just like in case of another pseudo-protocol classpath:.

[jhoeller]

If pattern support is desirable as well, then the method to use is org.springframework.core.io.support.ResourcePatternUtils#isUrl. The regular ResourceUtils is only really designed for single resource scenarios, not for matching patterns into multiple resources.

So if Boot intends to supports patterns there, it should simply call ResourcePatternUtils instead.