f751b38795
The JDK has decent support for walking a file system (via the FileSystem API in java.nio.file), but prior to this commit Spring still used hand-rolled pre-Java 7 code. Also, in principle, FileSystem can be an abstraction used to express any hierarchy of resources through their URIs. This is a good fit with the Spring Resource abstraction, and for instance would mean that GraalVM native images could potentially do classpath scanning through a custom URI and FileSystem already provided by GraalVM. In light of the above, this commit overhauls the implementation of PathMatchingResourcePatternResolver to use a java.nio.file.FileSystem to find matching resources within a file system. As a side effect, several obsolete `protected` methods have been removed from PathMatchingResourcePatternResolver. See gh-29163
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