Add info log message if AOT mode is enabled

Closes gh-32396

Author: mhalbritter

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/StartupInfoLogger.java

@@ -24,6 +24,7 @@
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
+import org.springframework.aot.AotDetector;
 import org.springframework.boot.system.ApplicationHome;
 import org.springframework.boot.system.ApplicationPid;
 import org.springframework.context.ApplicationContext;
@@ -64,7 +65,8 @@ void logStarted(Log applicationLog, Duration timeTakenToStartup) {
 
 	private CharSequence getStartingMessage() {
 		StringBuilder message = new StringBuilder();
-		message.append("Starting ");
+		message.append("Starting");
+		appendAotMode(message);
 		appendApplicationName(message);
 		appendVersion(message, this.sourceClass);
 		appendJavaVersion(message);
@@ -85,7 +87,7 @@ private CharSequence getRunningMessage() {
 
 	private CharSequence getStartedMessage(Duration timeTakenToStartup) {
 		StringBuilder message = new StringBuilder();
-		message.append("Started ");
+		message.append("Started");
 		appendApplicationName(message);
 		message.append(" in ");
 		message.append(timeTakenToStartup.toMillis() / 1000.0);
@@ -100,9 +102,13 @@ private CharSequence getStartedMessage(Duration timeTakenToStartup) {
 		return message;
 	}
 
+	private void appendAotMode(StringBuilder message) {
+		append(message, "", () -> AotDetector.useGeneratedArtifacts() ? "AOT-processed" : null);
+	}
+
 	private void appendApplicationName(StringBuilder message) {
-		String name = (this.sourceClass != null) ? ClassUtils.getShortName(this.sourceClass) : "application";
-		message.append(name);
+		append(message, "",
+				() -> (this.sourceClass != null) ? ClassUtils.getShortName(this.sourceClass) : "application");
 	}
 
 	private void appendVersion(StringBuilder message, Class<?> source) {

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/StartupInfoLoggerTests.java

@@ -36,6 +36,7 @@
  *
  * @author Dave Syer
  * @author Andy Wilkinson
+ * @author Moritz Halbritter
  */
 class StartupInfoLoggerTests {
 
@@ -53,6 +54,25 @@ void startingFormat() throws UnknownHostException {
 				+ System.getProperty("user.dir") + ")");
 	}
 
+	@Test
+	void startingFormatInAotMode() throws UnknownHostException {
+		System.setProperty("spring.aot.enabled", "true");
+		try {
+			given(this.log.isInfoEnabled()).willReturn(true);
+			new StartupInfoLogger(getClass()).logStarting(this.log);
+			ArgumentCaptor<Object> captor = ArgumentCaptor.forClass(Object.class);
+			then(this.log).should().info(captor.capture());
+			assertThat(captor.getValue().toString()).contains("Starting AOT-processed " + getClass().getSimpleName()
+					+ " using Java " + System.getProperty("java.version") + " on "
+					+ InetAddress.getLocalHost().getHostName() + " with PID " + new ApplicationPid() + " (started by "
+					+ System.getProperty("user.name") + " in " + System.getProperty("user.dir") + ")");
+
+		}
+		finally {
+			System.clearProperty("spring.aot.enabled");
+		}
+	}
+
 	@Test
 	void startedFormat() {
 		given(this.log.isInfoEnabled()).willReturn(true);