Align Gradle's plugin's META-INF repackaging with Maven plugin's

Closes gh-28562

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2021 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -182,6 +182,15 @@ class BootArchiveSupport {
 		spec.filesMatching("module-info.class", BootArchiveSupport::moveToRoot);
 	}
 
+	void moveMetaInfToRoot(CopySpec spec) {
+		spec.eachFile((file) -> {
+			String path = file.getRelativeSourcePath().getPathString();
+			if (path.startsWith("META-INF/") && !path.equals("META-INF/aop.xml") && !path.endsWith(".kotlin_module")) {
+				moveToRoot(file);
+			}
+		});
+	}
+
 	private static void moveToRoot(FileCopyDetails details) {
 		details.setRelativePath(details.getRelativeSourcePath());
 	}

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2021 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -91,8 +91,8 @@ public class BootJar extends Jar implements BootArchive {
 	private void configureBootInfSpec(CopySpec bootInfSpec) {
 		bootInfSpec.into("classes", fromCallTo(this::classpathDirectories));
 		bootInfSpec.into("lib", fromCallTo(this::classpathFiles)).eachFile(this.support::excludeNonZipFiles);
-		bootInfSpec.filesMatching("module-info.class",
-				(details) -> details.setRelativePath(details.getRelativeSourcePath()));
+		this.support.moveModuleInfoToRoot(bootInfSpec);
+		this.support.moveMetaInfToRoot(bootInfSpec);
 	}
 
 	private Iterable<File> classpathDirectories() {

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2021 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -74,6 +74,7 @@ public class BootWar extends War implements BootArchive {
 		this.mainClass = project.getObjects().property(String.class);
 		getWebInf().into("lib-provided", fromCallTo(this::getProvidedLibFiles));
 		this.support.moveModuleInfoToRoot(getRootSpec());
+		this.support.moveMetaInfToRoot(getRootSpec());
 		getRootSpec().eachFile(this.support::excludeNonZipLibraryFiles);
 		project.getConfigurations().all((configuration) -> {
 			ResolvableDependencies incoming = configuration.getIncoming();

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2021 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -185,6 +185,66 @@ abstract class AbstractBootArchiveTests<T extends Jar & BootArchive> {
 		}
 	}
 
+	@Test
+	void metaInfEntryIsPackagedInTheRootOfTheArchive() throws IOException {
+		this.task.getMainClass().set("com.example.Main");
+		File classpathDirectory = new File(this.temp, "classes");
+		File metaInfEntry = new File(classpathDirectory, "META-INF/test");
+		metaInfEntry.getParentFile().mkdirs();
+		metaInfEntry.createNewFile();
+		File applicationClass = new File(classpathDirectory, "com/example/Application.class");
+		applicationClass.getParentFile().mkdirs();
+		applicationClass.createNewFile();
+		this.task.classpath(classpathDirectory);
+		executeTask();
+		try (JarFile jarFile = new JarFile(this.task.getArchiveFile().get().getAsFile())) {
+			assertThat(jarFile.getEntry(this.classesPath + "com/example/Application.class")).isNotNull();
+			assertThat(jarFile.getEntry("com/example/Application.class")).isNull();
+			assertThat(jarFile.getEntry(this.classesPath + "META-INF/test")).isNull();
+			assertThat(jarFile.getEntry("META-INF/test")).isNotNull();
+		}
+	}
+
+	@Test
+	void aopXmlIsPackagedBeneathClassesDirectory() throws IOException {
+		this.task.getMainClass().set("com.example.Main");
+		File classpathDirectory = new File(this.temp, "classes");
+		File aopXml = new File(classpathDirectory, "META-INF/aop.xml");
+		aopXml.getParentFile().mkdirs();
+		aopXml.createNewFile();
+		File applicationClass = new File(classpathDirectory, "com/example/Application.class");
+		applicationClass.getParentFile().mkdirs();
+		applicationClass.createNewFile();
+		this.task.classpath(classpathDirectory);
+		executeTask();
+		try (JarFile jarFile = new JarFile(this.task.getArchiveFile().get().getAsFile())) {
+			assertThat(jarFile.getEntry(this.classesPath + "com/example/Application.class")).isNotNull();
+			assertThat(jarFile.getEntry("com/example/Application.class")).isNull();
+			assertThat(jarFile.getEntry(this.classesPath + "META-INF/aop.xml")).isNotNull();
+			assertThat(jarFile.getEntry("META-INF/aop.xml")).isNull();
+		}
+	}
+
+	@Test
+	void kotlinModuleIsPackagedBeneathClassesDirectory() throws IOException {
+		this.task.getMainClass().set("com.example.Main");
+		File classpathDirectory = new File(this.temp, "classes");
+		File kotlinModule = new File(classpathDirectory, "META-INF/example.kotlin_module");
+		kotlinModule.getParentFile().mkdirs();
+		kotlinModule.createNewFile();
+		File applicationClass = new File(classpathDirectory, "com/example/Application.class");
+		applicationClass.getParentFile().mkdirs();
+		applicationClass.createNewFile();
+		this.task.classpath(classpathDirectory);
+		executeTask();
+		try (JarFile jarFile = new JarFile(this.task.getArchiveFile().get().getAsFile())) {
+			assertThat(jarFile.getEntry(this.classesPath + "com/example/Application.class")).isNotNull();
+			assertThat(jarFile.getEntry("com/example/Application.class")).isNull();
+			assertThat(jarFile.getEntry(this.classesPath + "META-INF/example.kotlin_module")).isNotNull();
+			assertThat(jarFile.getEntry("META-INF/example.kotlin_module")).isNull();
+		}
+	}
+
 	@Test
 	void classpathCanBeSetUsingAFileCollection() throws IOException {
 		this.task.getMainClass().set("com.example.Main");