Support wildcard configtree imports

Update `ConfigTreeConfigDataResource` so that a wildcard suffix can
be used to import multiple folders. The pattern logic from
`StandardConfigDataLocationResolver` has been extracted into a new
`LocationResourceLoader` class so that it can be reused.

Closes gh-22958

spring-boot-project/spring-boot-docs/src/docs/asciidoc/spring-boot-features.adoc

@@ -796,13 +796,46 @@ To import these properties, you can add the following to your `application.prope
 ----
 	spring:
 	  config:
-	    import: "optional:configtree:/etc/config"
+	    import: "optional:configtree:/etc/config/"
 ----
 
 You can then access or inject `myapp.username` and `myapp.password` properties from the `Environment` in the usual way.
 
 TIP: Configuration tree values can be bound to both string `String` and `byte[]` types depending on the contents expected.
 
+If you have multiple config trees to import from the same parent folder you can use a wildcard shortcut.
+Any `configtree:` location that ends with `/*/` will import all immediate children as config trees.
+
+For example, given the following volume:
+
+[source,indent=0]
+----
+	etc/
+	  config/
+	    dbconfig/
+	      db/
+	        username
+	        password
+	    mqconfig/
+	      mq/
+	        username
+	        password
+----
+
+You can use `configtree:/etc/config/*/` as the import location:
+
+[source,yaml,indent=0,configprops,configblocks]
+----
+	spring:
+	  config:
+	    import: "optional:configtree:/etc/config/*/"
+----
+
+This will add `db.username`, `db.password`, `mq.username` and `mq.password` properties.
+
+NOTE: Directories loaded using a wildcard are sorted alphabetically.
+If you need a different order, then you should list each location as a separate import
+
 
 
 [[boot-features-external-config-placeholders-in-properties]]

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

@@ -16,9 +16,16 @@
 
 package org.springframework.boot.context.config;
 
+import java.io.IOException;
+import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
+import org.springframework.boot.context.config.LocationResourceLoader.ResourceType;
+import org.springframework.core.io.Resource;
+import org.springframework.core.io.ResourceLoader;
+import org.springframework.util.Assert;
+
 /**
  * {@link ConfigDataLocationResolver} for config tree locations.
  *
@@ -30,6 +37,12 @@ public class ConfigTreeConfigDataLocationResolver implements ConfigDataLocationR
 
 	private static final String PREFIX = "configtree:";
 
+	private final LocationResourceLoader resourceLoader;
+
+	public ConfigTreeConfigDataLocationResolver(ResourceLoader resourceLoader) {
+		this.resourceLoader = new LocationResourceLoader(resourceLoader);
+	}
+
 	@Override
 	public boolean isResolvable(ConfigDataLocationResolverContext context, ConfigDataLocation location) {
 		return location.hasPrefix(PREFIX);
@@ -38,8 +51,27 @@ public class ConfigTreeConfigDataLocationResolver implements ConfigDataLocationR
 	@Override
 	public List<ConfigTreeConfigDataResource> resolve(ConfigDataLocationResolverContext context,
 			ConfigDataLocation location) {
-		ConfigTreeConfigDataResource resolved = new ConfigTreeConfigDataResource(location.getNonPrefixedValue(PREFIX));
-		return Collections.singletonList(resolved);
+		try {
+			return resolve(context, location.getNonPrefixedValue(PREFIX));
+		}
+		catch (IOException ex) {
+			throw new ConfigDataLocationNotFoundException(location, ex);
+		}
+	}
+
+	private List<ConfigTreeConfigDataResource> resolve(ConfigDataLocationResolverContext context, String location)
+			throws IOException {
+		Assert.isTrue(location.endsWith("/"),
+				() -> String.format("Config tree location '%s' must end with '/'", location));
+		if (!this.resourceLoader.isPattern(location)) {
+			return Collections.singletonList(new ConfigTreeConfigDataResource(location));
+		}
+		Resource[] resources = this.resourceLoader.getResources(location, ResourceType.DIRECTORY);
+		List<ConfigTreeConfigDataResource> resolved = new ArrayList<>(resources.length);
+		for (Resource resource : resources) {
+			resolved.add(new ConfigTreeConfigDataResource(resource.getFile().toPath()));
+		}
+		return resolved;
 	}
 
 }

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

@@ -40,6 +40,11 @@ public class ConfigTreeConfigDataResource extends ConfigDataResource {
 		this.path = Paths.get(path).toAbsolutePath();
 	}
 
+	ConfigTreeConfigDataResource(Path path) {
+		Assert.notNull(path, "Path must not be null");
+		this.path = path.toAbsolutePath();
+	}
+
 	Path getPath() {
 		return this.path;
 	}

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

+/*
+ * Copyright 2012-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.context.config;
+
+import java.io.File;
+import java.io.FilenameFilter;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Comparator;
+import java.util.List;
+
+import org.springframework.core.io.FileSystemResource;
+import org.springframework.core.io.Resource;
+import org.springframework.core.io.ResourceLoader;
+import org.springframework.core.io.support.ResourcePatternResolver;
+import org.springframework.util.Assert;
+import org.springframework.util.ResourceUtils;
+import org.springframework.util.StringUtils;
+
+/**
+ * Strategy interface for loading resources from a location. Supports single resource and
+ * simple wildcard directory patterns.
+ *
+ * @author Phillip Webb
+ * @author Madhura Bhave
+ */
+class LocationResourceLoader {
+
+	private static final Resource[] EMPTY_RESOURCES = {};
+
+	private static final Comparator<File> FILE_PATH_COMPARATOR = Comparator.comparing(File::getAbsolutePath);
+
+	private static final Comparator<File> FILE_NAME_COMPARATOR = Comparator.comparing(File::getName);
+
+	private final ResourceLoader resourceLoader;
+
+	/**
+	 * Create a new {@link LocationResourceLoader} instance.
+	 * @param resourceLoader the underlying resource loader
+	 */
+	LocationResourceLoader(ResourceLoader resourceLoader) {
+		this.resourceLoader = resourceLoader;
+	}
+
+	/**
+	 * Returns if the location contains a pattern.
+	 * @param location the location to check
+	 * @return if the location is a pattern
+	 */
+	boolean isPattern(String location) {
+		return StringUtils.hasLength(location) && location.contains("*");
+	}
+
+	/**
+	 * Get a single resource from a non-pattern location.
+	 * @param location the location
+	 * @return the resource
+	 * @see #isPattern(String)
+	 */
+	Resource getResource(String location) {
+		validateNonPattern(location);
+		location = StringUtils.cleanPath(location);
+		if (!ResourceUtils.isUrl(location)) {
+			location = ResourceUtils.FILE_URL_PREFIX + location;
+		}
+		return this.resourceLoader.getResource(location);
+	}
+
+	private void validateNonPattern(String location) {
+		Assert.state(!isPattern(location), () -> String.format("Location '%s' must not be a pattern", location));
+	}
+
+	/**
+	 * Get a multiple resources from a location pattern.
+	 * @param location the location pattern
+	 * @param type the type of resource to return
+	 * @return the resources
+	 * @see #isPattern(String)
+	 */
+	Resource[] getResources(String location, ResourceType type) {
+		validatePattern(location, type);
+		String directoryPath = location.substring(0, location.indexOf("*/"));
+		String fileName = location.substring(location.lastIndexOf("/") + 1);
+		Resource directoryResource = getResource(directoryPath);
+		if (!directoryResource.exists()) {
+			return new Resource[] { directoryResource };
+		}
+		File directory = getDirectory(location, directoryResource);
+		File[] subDirectories = directory.listFiles(this::isVisibleDirectory);
+		if (subDirectories == null) {
+			return EMPTY_RESOURCES;
+		}
+		Arrays.sort(subDirectories, FILE_PATH_COMPARATOR);
+		if (type == ResourceType.DIRECTORY) {
+			return Arrays.stream(subDirectories).map(FileSystemResource::new).toArray(Resource[]::new);
+		}
+		List<Resource> resources = new ArrayList<>();
+		FilenameFilter filter = (dir, name) -> name.equals(fileName);
+		for (File subDirectory : subDirectories) {
+			File[] files = subDirectory.listFiles(filter);
+			if (files != null) {
+				Arrays.sort(files, FILE_NAME_COMPARATOR);
+				Arrays.stream(files).map(FileSystemResource::new).forEach(resources::add);
+			}
+		}
+		return resources.toArray(EMPTY_RESOURCES);
+	}
+
+	private void validatePattern(String location, ResourceType type) {
+		Assert.state(isPattern(location), () -> String.format("Location '%s' must be a pattern", location));
+		Assert.state(!location.startsWith(ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX),
+				() -> String.format("Location '%s' cannot use classpath wildcards", location));
+		Assert.state(StringUtils.countOccurrencesOf(location, "*") == 1,
+				() -> String.format("Location '%s' cannot contain multiple wildcards", location));
+		String directoryPath = (type != ResourceType.DIRECTORY) ? location.substring(0, location.lastIndexOf("/") + 1)
+				: location;
+		Assert.state(directoryPath.endsWith("*/"), () -> String.format("Location '%s' must end with '*/'", location));
+	}
+
+	private File getDirectory(String patternLocation, Resource resource) {
+		try {
+			File directory = resource.getFile();
+			Assert.state(directory.isDirectory(), () -> "'" + directory + "' is not a directory");
+			return directory;
+		}
+		catch (Exception ex) {
+			throw new IllegalStateException(
+					"Unable to load config data resource from pattern '" + patternLocation + "'", ex);
+		}
+	}
+
+	private boolean isVisibleDirectory(File file) {
+		return file.isDirectory() && !file.getName().startsWith(".");
+	}
+
+	/**
+	 * Resource types that can be returned.
+	 */
+	enum ResourceType {
+
+		/**
+		 * Return file resources.
+		 */
+		FILE,
+
+		/**
+		 * Return directory resources.
+		 */
+		DIRECTORY
+
+	}
+
+}

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

@@ -16,12 +16,8 @@
 
 package org.springframework.boot.context.config;
 
-import java.io.File;
-import java.io.FilenameFilter;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Collections;
-import java.util.Comparator;
 import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Set;
@@ -30,18 +26,16 @@ import java.util.regex.Pattern;
 
 import org.apache.commons.logging.Log;
 
+import org.springframework.boot.context.config.LocationResourceLoader.ResourceType;
 import org.springframework.boot.context.properties.bind.Binder;
 import org.springframework.boot.env.PropertySourceLoader;
 import org.springframework.core.Ordered;
 import org.springframework.core.env.Environment;
-import org.springframework.core.io.FileSystemResource;
 import org.springframework.core.io.Resource;
 import org.springframework.core.io.ResourceLoader;
-import org.springframework.core.io.support.ResourcePatternResolver;
 import org.springframework.core.io.support.SpringFactoriesLoader;
 import org.springframework.core.log.LogMessage;
 import org.springframework.util.Assert;
-import org.springframework.util.ResourceUtils;
 import org.springframework.util.StringUtils;
 
 /**
@@ -61,10 +55,6 @@ public class StandardConfigDataLocationResolver
 
 	private static final String[] DEFAULT_CONFIG_NAMES = { "application" };
 
-	private static final Resource[] EMPTY_RESOURCES = {};
-
-	private static final Comparator<File> FILE_COMPARATOR = Comparator.comparing(File::getAbsolutePath);
-
 	private static final Pattern URL_PREFIX = Pattern.compile("^([a-zA-Z][a-zA-Z0-9*]*?:)(.*$)");
 
 	private static final Pattern EXTENSION_HINT_PATTERN = Pattern.compile("^(.*)\\[(\\.\\w+)\\](?!\\[)$");
@@ -77,7 +67,7 @@ public class StandardConfigDataLocationResolver
 
 	private final String[] configNames;
 
-	private final ResourceLoader resourceLoader;
+	private final LocationResourceLoader resourceLoader;
 
 	/**
 	 * Create a new {@link StandardConfigDataLocationResolver} instance.
@@ -90,7 +80,7 @@ public class StandardConfigDataLocationResolver
 		this.propertySourceLoaders = SpringFactoriesLoader.loadFactories(PropertySourceLoader.class,
 				getClass().getClassLoader());
 		this.configNames = getConfigNames(binder);
-		this.resourceLoader = resourceLoader;
+		this.resourceLoader = new LocationResourceLoader(resourceLoader);
 	}
 
 	private String[] getConfigNames(Binder binder) {
@@ -243,20 +233,20 @@ public class StandardConfigDataLocationResolver
 	}
 
 	private void assertDirectoryExists(StandardConfigDataReference reference) {
-		Resource resource = loadResource(reference.getDirectory());
+		Resource resource = this.resourceLoader.getResource(reference.getDirectory());
 		StandardConfigDataResource configDataResource = new StandardConfigDataResource(reference, resource);
 		ConfigDataResourceNotFoundException.throwIfDoesNotExist(configDataResource, resource);
 	}
 
 	private List<StandardConfigDataResource> resolve(StandardConfigDataReference reference) {
-		if (!reference.isPatternLocation()) {
+		if (!this.resourceLoader.isPattern(reference.getResourceLocation())) {
 			return resolveNonPattern(reference);
 		}
 		return resolvePattern(reference);
 	}
 
 	private List<StandardConfigDataResource> resolveNonPattern(StandardConfigDataReference reference) {
-		Resource resource = loadResource(reference.getResourceLocation());
+		Resource resource = this.resourceLoader.getResource(reference.getResourceLocation());
 		if (!resource.exists() && reference.isSkippable()) {
 			logSkippingResource(reference);
 			return Collections.emptyList();
@@ -265,9 +255,8 @@ public class StandardConfigDataLocationResolver
 	}
 
 	private List<StandardConfigDataResource> resolvePattern(StandardConfigDataReference reference) {
-		validatePatternLocation(reference.getResourceLocation());
 		List<StandardConfigDataResource> resolved = new ArrayList<>();
-		for (Resource resource : getResourcesFromResourceLocationPattern(reference.getResourceLocation())) {
+		for (Resource resource : this.resourceLoader.getResources(reference.getResourceLocation(), ResourceType.FILE)) {
 			if (!resource.exists() && reference.isSkippable()) {
 				logSkippingResource(reference);
 			}
@@ -287,62 +276,4 @@ public class StandardConfigDataLocationResolver
 		return new StandardConfigDataResource(reference, resource);
 	}
 
-	private void validatePatternLocation(String resourceLocation) {
-		Assert.state(!resourceLocation.startsWith(ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX),
-				"Classpath wildcard patterns cannot be used as a search location");
-		Assert.state(StringUtils.countOccurrencesOf(resourceLocation, "*") == 1,
-				() -> "Search location '" + resourceLocation + "' cannot contain multiple wildcards");
-		String directoryPath = resourceLocation.substring(0, resourceLocation.lastIndexOf("/") + 1);
-		Assert.state(directoryPath.endsWith("*/"),
-				() -> "Search location '" + resourceLocation + "' must end with '*/'");
-	}
-
-	private Resource[] getResourcesFromResourceLocationPattern(String resourceLocationPattern) {
-		String directoryPath = resourceLocationPattern.substring(0, resourceLocationPattern.indexOf("*/"));
-		String fileName = resourceLocationPattern.substring(resourceLocationPattern.lastIndexOf("/") + 1);
-		Resource directoryResource = loadResource(directoryPath);
-		if (!directoryResource.exists()) {
-			return new Resource[] { directoryResource };
-		}
-		File directory = getDirectory(resourceLocationPattern, directoryResource);
-		File[] subDirectories = directory.listFiles(this::isVisibleDirectory);
-		if (subDirectories == null) {
-			return EMPTY_RESOURCES;
-		}
-		Arrays.sort(subDirectories, FILE_COMPARATOR);
-		List<Resource> resources = new ArrayList<>();
-		FilenameFilter filter = (dir, name) -> name.equals(fileName);
-		for (File subDirectory : subDirectories) {
-			File[] files = subDirectory.listFiles(filter);
-			if (files != null) {
-				Arrays.stream(files).map(FileSystemResource::new).forEach(resources::add);
-			}
-		}
-		return resources.toArray(EMPTY_RESOURCES);
-	}
-
-	private Resource loadResource(String location) {
-		location = StringUtils.cleanPath(location);
-		if (!ResourceUtils.isUrl(location)) {
-			location = ResourceUtils.FILE_URL_PREFIX + location;
-		}
-		return this.resourceLoader.getResource(location);
-	}
-
-	private File getDirectory(String patternLocation, Resource resource) {
-		try {
-			File directory = resource.getFile();
-			Assert.state(directory.isDirectory(), () -> "'" + directory + "' is not a directory");
-			return directory;
-		}
-		catch (Exception ex) {
-			throw new IllegalStateException(
-					"Unable to load config data resource from pattern '" + patternLocation + "'", ex);
-		}
-	}
-
-	private boolean isVisibleDirectory(File file) {
-		return file.isDirectory() && !file.getName().startsWith(".");
-	}
-
 }

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

@@ -78,10 +78,6 @@ class StandardConfigDataReference {
 		return this.configDataLocation.isOptional() || this.directory != null || this.profile != null;
 	}
 
-	boolean isPatternLocation() {
-		return this.resourceLocation.contains("*");
-	}
-
 	PropertySourceLoader getPropertySourceLoader() {
 		return this.propertySourceLoader;
 	}

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

@@ -20,6 +20,10 @@ import java.io.File;
 import java.util.List;
 
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+import org.springframework.core.io.DefaultResourceLoader;
+import org.springframework.util.FileCopyUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.Mockito.mock;
@@ -32,10 +36,14 @@ import static org.mockito.Mockito.mock;
  */
 class ConfigTreeConfigDataLocationResolverTests {
 
-	private ConfigTreeConfigDataLocationResolver resolver = new ConfigTreeConfigDataLocationResolver();
+	private ConfigTreeConfigDataLocationResolver resolver = new ConfigTreeConfigDataLocationResolver(
+			new DefaultResourceLoader());
 
 	private ConfigDataLocationResolverContext context = mock(ConfigDataLocationResolverContext.class);
 
+	@TempDir
+	File temp;
+
 	@Test
 	void isResolvableWhenPrefixMatchesReturnsTrue() {
 		assertThat(this.resolver.isResolvable(this.context, ConfigDataLocation.of("configtree:/etc/config"))).isTrue();
@@ -50,10 +58,26 @@ class ConfigTreeConfigDataLocationResolverTests {
 	@Test
 	void resolveReturnsConfigVolumeMountLocation() {
 		List<ConfigTreeConfigDataResource> locations = this.resolver.resolve(this.context,
-				ConfigDataLocation.of("configtree:/etc/config"));
+				ConfigDataLocation.of("configtree:/etc/config/"));
 		assertThat(locations.size()).isEqualTo(1);
 		assertThat(locations).extracting(Object::toString)
 				.containsExactly("config tree [" + new File("/etc/config").getAbsolutePath() + "]");
 	}
 
+	@Test
+	void resolveWilcardPattern() throws Exception {
+		File directoryA = new File(this.temp, "a");
+		File directoryB = new File(this.temp, "b");
+		directoryA.mkdirs();
+		directoryB.mkdirs();
+		FileCopyUtils.copy("test".getBytes(), new File(directoryA, "spring"));
+		FileCopyUtils.copy("test".getBytes(), new File(directoryB, "boot"));
+		List<ConfigTreeConfigDataResource> locations = this.resolver.resolve(this.context,
+				ConfigDataLocation.of("configtree:" + this.temp.getAbsolutePath() + "/*/"));
+		assertThat(locations.size()).isEqualTo(2);
+		assertThat(locations).extracting(Object::toString).containsExactly(
+				"config tree [" + directoryA.getAbsolutePath() + "]",
+				"config tree [" + directoryB.getAbsolutePath() + "]");
+	}
+
 }

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

@@ -17,6 +17,7 @@
 package org.springframework.boot.context.config;
 
 import java.io.File;
+import java.nio.file.Path;
 
 import org.junit.jupiter.api.Test;
 
@@ -31,9 +32,15 @@ import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException
  */
 public class ConfigTreeConfigDataResourceTests {
 
+	@Test
+	void constructorWhenPathStringIsNullThrowsException() {
+		assertThatIllegalArgumentException().isThrownBy(() -> new ConfigTreeConfigDataResource((String) null))
+				.withMessage("Path must not be null");
+	}
+
 	@Test
 	void constructorWhenPathIsNullThrowsException() {
-		assertThatIllegalArgumentException().isThrownBy(() -> new ConfigTreeConfigDataResource(null))
+		assertThatIllegalArgumentException().isThrownBy(() -> new ConfigTreeConfigDataResource((Path) null))
 				.withMessage("Path must not be null");
 	}
 

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

+/*
+ * Copyright 2012-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.context.config;
+
+import java.io.File;
+import java.io.IOException;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+import org.springframework.boot.context.config.LocationResourceLoader.ResourceType;
+import org.springframework.core.io.DefaultResourceLoader;
+import org.springframework.core.io.Resource;
+import org.springframework.util.FileCopyUtils;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatIllegalStateException;
+
+/**
+ * Tests for {@link LocationResourceLoader}.
+ *
+ * @author Phillip Webb
+ */
+class LocationResourceLoaderTests {
+
+	private LocationResourceLoader loader = new LocationResourceLoader(new DefaultResourceLoader());
+
+	@TempDir
+	File temp;
+
+	@Test
+	void isPatternWhenHasAsteriskReturnsTrue() {
+		assertThat(this.loader.isPattern("spring/*/boot")).isTrue();
+	}
+
+	@Test
+	void isPatternWhenNoAsteriskReturnsFalse() {
+		assertThat(this.loader.isPattern("spring/boot")).isFalse();
+	}
+
+	@Test
+	void getResourceWhenPatternThrowsException() {
+		assertThatIllegalStateException().isThrownBy(() -> this.loader.getResource("spring/boot/*"))
+				.withMessage("Location 'spring/boot/*' must not be a pattern");
+	}
+
+	@Test
+	void getResourceReturnsResource() throws Exception {
+		File file = new File(this.temp, "file");
+		FileCopyUtils.copy("test".getBytes(), file);
+		Resource resource = this.loader.getResource(file.toURI().toString());
+		assertThat(resource.getInputStream()).hasContent("test");
+	}
+
+	@Test
+	void getResourceWhenNotUrlReturnsResource() throws Exception {
+		File file = new File(this.temp, "file");
+		FileCopyUtils.copy("test".getBytes(), file);
+		Resource resource = this.loader.getResource(file.getAbsolutePath());
+		assertThat(resource.getInputStream()).hasContent("test");
+	}
+
+	@Test
+	void getResourceWhenNonCleanPathReturnsResource() throws Exception {
+		File file = new File(this.temp, "file");
+		FileCopyUtils.copy("test".getBytes(), file);
+		Resource resource = this.loader.getResource(this.temp.getAbsolutePath() + "/spring/../file");
+		assertThat(resource.getInputStream()).hasContent("test");
+	}
+
+	@Test
+	void getResourcesWhenNotPatternThrowsException() {
+		assertThatIllegalStateException().isThrownBy(() -> this.loader.getResources("spring/boot", ResourceType.FILE))
+				.withMessage("Location 'spring/boot' must be a pattern");
+	}
+
+	@Test
+	void getResourcesWhenLocationStartsWithClasspathWildcardThrowsException() {
+		assertThatIllegalStateException()
+				.isThrownBy(() -> this.loader.getResources("classpath*:spring/boot/*/", ResourceType.FILE))
+				.withMessage("Location 'classpath*:spring/boot/*/' cannot use classpath wildcards");
+	}
+
+	@Test
+	void getResourcesWhenLocationContainsMultipleWildcardsThrowsException() {
+		assertThatIllegalStateException()
+				.isThrownBy(() -> this.loader.getResources("spring/*/boot/*/", ResourceType.FILE))
+				.withMessage("Location 'spring/*/boot/*/' cannot contain multiple wildcards");
+	}
+
+	@Test
+	void getResourcesWhenPatternDoesNotEndWithAsteriskSlashThrowsException() {
+		assertThatIllegalStateException().isThrownBy(() -> this.loader.getResources("spring/boot/*", ResourceType.FILE))
+				.withMessage("Location 'spring/boot/*' must end with '*/'");
+	}
+
+	@Test
+	void getFileResourceReturnsResources() throws Exception {
+		createTree();
+		Resource[] resources = this.loader.getResources(this.temp.getAbsolutePath() + "/*/file", ResourceType.FILE);
+		assertThat(resources).hasSize(2);
+		assertThat(resources[0].getInputStream()).hasContent("a");
+		assertThat(resources[1].getInputStream()).hasContent("b");
+	}
+
+	@Test
+	void getDirectoryResourceReturnsResources() throws Exception {
+		createTree();
+		Resource[] resources = this.loader.getResources(this.temp.getAbsolutePath() + "/*/", ResourceType.DIRECTORY);
+		assertThat(resources).hasSize(2);
+		assertThat(resources[0].getFilename()).isEqualTo("a");
+		assertThat(resources[1].getFilename()).isEqualTo("b");
+	}
+
+	@Test
+	void getResourcesWhenHasHiddenDirectoriesFiltersResults() throws IOException {
+		createTree();
+		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);
+		assertThat(resources).hasSize(2);
+		assertThat(resources[0].getInputStream()).hasContent("a");
+		assertThat(resources[1].getInputStream()).hasContent("b");
+	}
+
+	private void createTree() throws IOException {
+		File directoryA = new File(this.temp, "a");
+		File directoryB = new File(this.temp, "b");
+		directoryA.mkdirs();
+		directoryB.mkdirs();
+		FileCopyUtils.copy("a".getBytes(), new File(directoryA, "file"));
+		FileCopyUtils.copy("b".getBytes(), new File(directoryB, "file"));
+	}
+
+}

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

@@ -100,14 +100,14 @@ public class StandardConfigDataLocationResolverTests {
 	void resolveWhenLocationWildcardIsSpecifiedForClasspathLocationThrowsException() {
 		ConfigDataLocation location = ConfigDataLocation.of("classpath*:application.properties");
 		assertThatIllegalStateException().isThrownBy(() -> this.resolver.resolve(this.context, location))
-				.withMessageContaining("Classpath wildcard patterns cannot be used as a search location");
+				.withMessageContaining("Location 'classpath*:application.properties' cannot use classpath wildcards");
 	}
 
 	@Test
 	void resolveWhenLocationWildcardIsNotBeforeLastSlashThrowsException() {
 		ConfigDataLocation location = ConfigDataLocation.of("file:src/test/resources/*/config/");
 		assertThatIllegalStateException().isThrownBy(() -> this.resolver.resolve(this.context, location))
-				.withMessageStartingWith("Search location '").withMessageEndingWith("' must end with '*/'");
+				.withMessageStartingWith("Location '").withMessageEndingWith("' must end with '*/'");
 	}
 
 	@Test
@@ -123,8 +123,7 @@ public class StandardConfigDataLocationResolverTests {
 	void resolveWhenLocationHasMultipleWildcardsThrowsException() {
 		ConfigDataLocation location = ConfigDataLocation.of("file:src/test/resources/config/**/");
 		assertThatIllegalStateException().isThrownBy(() -> this.resolver.resolve(this.context, location))
-				.withMessageStartingWith("Search location '")
-				.withMessageEndingWith("' cannot contain multiple wildcards");
+				.withMessageStartingWith("Location '").withMessageEndingWith("' cannot contain multiple wildcards");
 	}
 
 	@Test