Merge pull request #44309 from nosan

* pr/44309:
  Handle absolute files on Windows

Closes gh-44309

Author: mhalbritter

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/io/ApplicationResourceLoader.java

@@ -216,10 +216,7 @@ public Resource getResource(String location) {
 		private Resource resolveFile(Resource resource) {
 			try {
 				File file = resource.getFile();
-				if (file.isAbsolute()) {
-					return resource;
-				}
-				return new ApplicationResource(new File(this.workingDirectory.toFile(), file.getPath()).getPath());
+				return new ApplicationResource(this.workingDirectory.resolve(file.toPath()));
 			}
 			catch (FileNotFoundException ex) {
 				return resource;
@@ -254,6 +251,10 @@ private static final class ApplicationResource extends FileSystemResource implem
 			super(path);
 		}
 
+		ApplicationResource(Path path) {
+			super(path);
+		}
+
 		@Override
 		public String getPathWithinContext() {
 			return getPath();