Merge branch '2.3.x'

Closes gh-24043

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/config/ConfigFileApplicationListener.java

@@ -554,7 +554,7 @@ public class ConfigFileApplicationListener implements EnvironmentPostProcessor,
 		private boolean hasHiddenPathElement(Resource resource) throws IOException {
 			String cleanPath = StringUtils.cleanPath(resource.getFile().getAbsolutePath());
 			for (Path value : Paths.get(cleanPath)) {
-				if (value.toString().startsWith(".")) {
+				if (value.toString().startsWith("..")) {
 					return true;
 				}
 			}

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/config/LocationResourceLoader.java

@@ -144,7 +144,7 @@ class LocationResourceLoader {
 	}
 
 	private boolean isVisibleDirectory(File file) {
-		return file.isDirectory() && !file.getName().startsWith(".");
+		return file.isDirectory() && !file.getName().startsWith("..");
 	}
 
 	/**

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/env/ConfigTreePropertySource.java

@@ -226,7 +226,7 @@ public class ConfigTreePropertySource extends EnumerablePropertySource<Path> imp
 		private static boolean hasHiddenPathElement(Path path) {
 			Iterator<Path> iterator = path.iterator();
 			while (iterator.hasNext()) {
-				if (iterator.next().toString().startsWith(".")) {
+				if (iterator.next().toString().startsWith("..")) {
 					return true;
 				}
 			}

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/config/LocationResourceLoaderTests.java

@@ -129,7 +129,7 @@ class LocationResourceLoaderTests {
 	@Test
 	void getResourcesWhenHasHiddenDirectoriesFiltersResults() throws IOException {
 		createTree();
-		File hiddenDirectory = new File(this.temp, ".a");
+		File hiddenDirectory = new File(this.temp, "..a");
 		hiddenDirectory.mkdirs();
 		FileCopyUtils.copy("h".getBytes(), new File(hiddenDirectory, "file"));
 		Resource[] resources = this.loader.getResources(this.temp.getAbsolutePath() + "/*/file", ResourceType.FILE);