Add native image manifest entry

A manifest entry `Spring-Boot-Native-Processed: true` is added to the
jar manifest by the Maven or Gradle plugin when the jar has been built
for use in a native image. With the Gradle plugin, this is done in
reaction to the GraalVM Native Image Plugin being applied to the
project. With the Maven plugin, this is done when the `native` profile
is applied to the build.

Author: scottfrederick

spring-boot-project/spring-boot-starters/spring-boot-starter-parent/build.gradle

@@ -233,6 +233,17 @@ publishing.publications.withType(MavenPublication) {
 					build {
 						pluginManagement {
 							plugins {
+								plugin {
+									delegate.groupId('org.apache.maven.plugins')
+									delegate.artifactId('maven-jar-plugin')
+									configuration {
+										archive {
+											manifestEntries {
+												delegate.'Spring-Boot-Native-Processed'("true")
+											}
+										}
+									}
+								}
 								plugin {
 									delegate.groupId('org.springframework.boot')
 									delegate.artifactId('spring-boot-maven-plugin')

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/main/java/org/springframework/boot/gradle/plugin/NativeImagePluginAction.java

@@ -59,10 +59,11 @@ public void execute(Project project) {
 			SourceSetContainer sourceSets = javaPluginExtension.getSourceSets();
 			GraalVMExtension graalVmExtension = configureGraalVmExtension(project);
 			configureMainNativeBinaryClasspath(project, sourceSets, graalVmExtension);
-			configureTestNativeBinaryClasspath(project, sourceSets, graalVmExtension);
+			configureTestNativeBinaryClasspath(sourceSets, graalVmExtension);
 			configureGraalVmReachabilityExtension(graalVmExtension);
 			copyReachabilityMetadataToBootJar(project);
 			configureBootBuildImageToProduceANativeImage(project);
+			configureJarManifestNativeAttribute(project);
 		});
 	}
 
@@ -85,8 +86,7 @@ private boolean isNotDevelopmentOnly(Configuration configuration) {
 		return !SpringBootPlugin.DEVELOPMENT_ONLY_CONFIGURATION_NAME.equals(configuration.getName());
 	}
 
-	private void configureTestNativeBinaryClasspath(Project project, SourceSetContainer sourceSets,
-			GraalVMExtension graalVmExtension) {
+	private void configureTestNativeBinaryClasspath(SourceSetContainer sourceSets, GraalVMExtension graalVmExtension) {
 		FileCollection runtimeClasspath = sourceSets.getByName(SpringBootAotPlugin.AOT_TEST_SOURCE_SET_NAME)
 			.getRuntimeClasspath();
 		graalVmExtension.getBinaries().getByName(NativeImagePlugin.NATIVE_TEST_EXTENSION).classpath(runtimeClasspath);
@@ -119,4 +119,11 @@ private void configureBootBuildImageToProduceANativeImage(Project project) {
 			});
 	}
 
+	private void configureJarManifestNativeAttribute(Project project) {
+		project.getTasks()
+			.named(SpringBootPlugin.BOOT_JAR_TASK_NAME, BootJar.class)
+			.configure((bootJar) -> bootJar
+				.manifest(((manifest) -> manifest.getAttributes().put("Spring-Boot-Native-Processed", true))));
+	}
+
 }

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/plugin/NativeImagePluginActionIntegrationTests.java

@@ -25,6 +25,7 @@
 import java.util.List;
 import java.util.jar.JarEntry;
 import java.util.jar.JarFile;
+import java.util.jar.Manifest;
 
 import org.gradle.testkit.runner.BuildResult;
 import org.gradle.testkit.runner.TaskOutcome;
@@ -115,6 +116,17 @@ void classesGeneratedDuringAotTestProcessingAreOnTheTestNativeImageClasspath() {
 				projectPath("build/resources/aotTest"), projectPath("build/generated/aotTestClasses"));
 	}
 
+	@TestTemplate
+	void nativeEntryIsAddedToManifest() throws IOException {
+		writeDummySpringApplicationAotProcessorMainClass();
+		BuildResult result = this.gradleBuild.build("bootJar");
+		assertThat(result.task(":bootJar").getOutcome()).isEqualTo(TaskOutcome.SUCCESS);
+		File buildLibs = new File(this.gradleBuild.getProjectDir(), "build/libs");
+		JarFile jarFile = new JarFile(new File(buildLibs, this.gradleBuild.getProjectDir().getName() + ".jar"));
+		Manifest manifest = jarFile.getManifest();
+		assertThat(manifest.getMainAttributes().getValue("Spring-Boot-Native-Processed")).isEqualTo("true");
+	}
+
 	private String projectPath(String path) {
 		try {
 			return new File(this.gradleBuild.getProjectDir(), path).getCanonicalPath();

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/plugin/NativeImagePluginActionIntegrationTests-nativeEntryIsAddedToManifest.gradle

@@ -0,0 +1,8 @@
+plugins {
+	id 'java'
+	id 'org.springframework.boot'
+	id 'org.springframework.boot.aot'
+}
+
+apply plugin: 'org.graalvm.buildtools.native'
+