Polish "Stop limiting layer customization to external modules"

See gh-21207

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/main/java/org/springframework/boot/gradle/tasks/bundling/LayerResolver.java

@@ -28,9 +28,6 @@ import org.gradle.api.artifacts.Configuration;
 import org.gradle.api.artifacts.ModuleVersionIdentifier;
 import org.gradle.api.artifacts.ResolvedArtifact;
 import org.gradle.api.artifacts.ResolvedConfiguration;
-import org.gradle.api.artifacts.component.ComponentIdentifier;
-import org.gradle.api.artifacts.component.ModuleComponentIdentifier;
-import org.gradle.api.artifacts.component.ProjectComponentIdentifier;
 import org.gradle.api.file.FileCopyDetails;
 import org.gradle.api.specs.Spec;
 
@@ -137,16 +134,9 @@ class LayerResolver {
 		private final Map<File, LibraryCoordinates> artifactCoordinates = new LinkedHashMap<>();
 
 		ResolvedConfigurationDependencies(ResolvedConfiguration resolvedConfiguration) {
-			if (resolvedConfiguration != null) {
-				for (ResolvedArtifact resolvedArtifact : resolvedConfiguration.getResolvedArtifacts()) {
-					ComponentIdentifier identifier = resolvedArtifact.getId().getComponentIdentifier();
-					if (identifier instanceof ModuleComponentIdentifier
-							|| identifier instanceof ProjectComponentIdentifier) {
-						this.artifactCoordinates.put(resolvedArtifact.getFile(),
-								new ModuleVersionIdentifierLibraryCoordinates(
-										resolvedArtifact.getModuleVersion().getId()));
-					}
-				}
+			for (ResolvedArtifact resolvedArtifact : resolvedConfiguration.getResolvedArtifacts()) {
+				this.artifactCoordinates.put(resolvedArtifact.getFile(),
+						new ModuleVersionIdentifierLibraryCoordinates(resolvedArtifact.getModuleVersion().getId()));
 			}
 		}
 

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/tasks/bundling/BootJarIntegrationTests.java

@@ -178,7 +178,7 @@ class BootJarIntegrationTests extends AbstractBootArchiveIntegrationTests {
 	}
 
 	@TestTemplate
-	void projectDependenciesCanBeIncludedInCustomLayer() throws IOException {
+	void multiModuleCustomLayers() throws IOException {
 		writeSettingsGradle();
 		writeMainClass();
 		writeResource();
@@ -188,8 +188,8 @@ class BootJarIntegrationTests extends AbstractBootArchiveIntegrationTests {
 		String layerToolsJar = "BOOT-INF/lib/" + JarModeLibrary.LAYER_TOOLS.getName();
 		try (JarFile jarFile = new JarFile(new File(this.gradleBuild.getProjectDir(), "build/libs").listFiles()[0])) {
 			assertThat(jarFile.getEntry(layerToolsJar)).isNotNull();
-			assertThat(jarFile.getEntry("BOOT-INF/lib/foo-1.2.3.jar")).isNotNull();
-			assertThat(jarFile.getEntry("BOOT-INF/lib/bar-1.2.3.jar")).isNotNull();
+			assertThat(jarFile.getEntry("BOOT-INF/lib/alpha-1.2.3.jar")).isNotNull();
+			assertThat(jarFile.getEntry("BOOT-INF/lib/bravo-1.2.3.jar")).isNotNull();
 			assertThat(jarFile.getEntry("BOOT-INF/lib/commons-lang3-3.9.jar")).isNotNull();
 			assertThat(jarFile.getEntry("BOOT-INF/lib/spring-core-5.2.5.RELEASE.jar")).isNotNull();
 			assertThat(jarFile.getEntry("BOOT-INF/lib/spring-jcl-5.2.5.RELEASE.jar")).isNotNull();
@@ -203,8 +203,8 @@ class BootJarIntegrationTests extends AbstractBootArchiveIntegrationTests {
 				"subproject-dependencies", "static", "app");
 		assertThat(indexedLayers.keySet()).containsExactlyElementsOf(layerNames);
 		Set<String> expectedSubprojectDependencies = new TreeSet<>();
-		expectedSubprojectDependencies.add("BOOT-INF/lib/foo-1.2.3.jar");
-		expectedSubprojectDependencies.add("BOOT-INF/lib/bar-1.2.3.jar");
+		expectedSubprojectDependencies.add("BOOT-INF/lib/alpha-1.2.3.jar");
+		expectedSubprojectDependencies.add("BOOT-INF/lib/bravo-1.2.3.jar");
 		Set<String> expectedDependencies = new TreeSet<>();
 		expectedDependencies.add("BOOT-INF/lib/spring-core-5.2.5.RELEASE.jar");
 		expectedDependencies.add("BOOT-INF/lib/spring-jcl-5.2.5.RELEASE.jar");
@@ -261,9 +261,9 @@ class BootJarIntegrationTests extends AbstractBootArchiveIntegrationTests {
 	}
 
 	private void writeSettingsGradle() {
-		File settings = new File(this.gradleBuild.getProjectDir(), "settings.gradle");
-		try (PrintWriter writer = new PrintWriter(new FileWriter(settings))) {
-			writer.println("include 'foo', 'bar'");
+		try (PrintWriter writer = new PrintWriter(
+				new FileWriter(new File(this.gradleBuild.getProjectDir(), "settings.gradle")))) {
+			writer.println("include 'alpha', 'bravo'");
 		}
 		catch (IOException ex) {
 			throw new RuntimeException(ex);

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/tasks/bundling/BootJarIntegrationTests-multiModuleCustomLayers.gradle

@@ -40,8 +40,8 @@ repositories {
 }
 
 dependencies {
-	implementation(project(':foo'))
-	implementation(project(':bar'))
+	implementation(project(':alpha'))
+	implementation(project(':bravo'))
 	implementation("commons-io:commons-io:2.7-SNAPSHOT")
 	implementation("org.apache.commons:commons-lang3:3.9")
 	implementation("org.springframework:spring-core:5.2.5.RELEASE")