Juergen Hoeller opened SPR-14484 and commented

Two common delegates have been in demand for a while and are now strongly suggested by our reactive efforts:

• A Resource.isFile() indicator for whether Resource.getFile() would succeed. This can make use of default methods in the interface, like isReadable() and isOpen().

• A MediaTypeFactory in org.springframework.http, resolving content type values to MediaType instances via the Java Activation Framework (remaining an implementation detail).

Issue Links:

• MediaTypeFactory should come with its own complete mime.types file [SPR-14908] #19474 MediaTypeFactory should come with its own complete mime.types file

Referenced from: commits 8bb34bc