Polish "Add info contributor support for JDK 24's VirtualThreadSchedulerMXBean"

See gh-43594

Author: mhalbritter

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/info/ProcessInfo.java

@@ -19,6 +19,7 @@
 import java.lang.management.ManagementFactory;
 import java.lang.management.MemoryMXBean;
 import java.lang.management.MemoryUsage;
+import java.lang.management.PlatformManagedObject;
 
 /**
  * Information about the process of the application.
@@ -75,23 +76,25 @@ public MemoryInfo getMemory() {
 
 	/**
 	 * Virtual threads information for the process. These values provide details about the
-	 * current state of virtual threads, including the number of mounted threads, queued threads,
-	 * the parallelism level, and the thread pool size.
-	 * @return an instance of {@link VirtualThreadsInfo} containing information about virtual threads,
-	 * or {@code null} if the VirtualThreadSchedulerMXBean is not available.
+	 * current state of virtual threads, including the number of mounted threads, queued
+	 * threads, the parallelism level, and the thread pool size.
+	 * @return an instance of {@link VirtualThreadsInfo} containing information about
+	 * virtual threads, or {@code null} if the VirtualThreadSchedulerMXBean is not
+	 * available.
 	 * @since 3.5.0
 	 */
+	@SuppressWarnings("unchecked")
 	public VirtualThreadsInfo getVirtualThreads() {
 		try {
-			Class mxBeanClass = Class.forName("jdk.management.VirtualThreadSchedulerMXBean");
+			Class<PlatformManagedObject> mxBeanClass = (Class<PlatformManagedObject>) Class
+				.forName("jdk.management.VirtualThreadSchedulerMXBean");
 			Object bean = ManagementFactory.getPlatformMXBean(mxBeanClass);
-			return new VirtualThreadsInfo(
-					(Integer) mxBeanClass.getMethod("getMountedVirtualThreadCount").invoke(bean),
+			return new VirtualThreadsInfo((Integer) mxBeanClass.getMethod("getMountedVirtualThreadCount").invoke(bean),
 					(Long) mxBeanClass.getMethod("getQueuedVirtualThreadCount").invoke(bean),
 					(Integer) mxBeanClass.getMethod("getParallelism").invoke(bean),
-					(Integer) mxBeanClass.getMethod("getPoolSize").invoke(bean)
-			);
-		} catch (ReflectiveOperationException e) {
+					(Integer) mxBeanClass.getMethod("getPoolSize").invoke(bean));
+		}
+		catch (ReflectiveOperationException ex) {
 			return null;
 		}
 	}

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/info/ProcessInfoTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2024 the original author or authors.
+ * Copyright 2012-2025 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.
@@ -17,10 +17,11 @@
 package org.springframework.boot.info;
 
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.EnabledForJreRange;
+import org.junit.jupiter.api.condition.JRE;
 
 import org.springframework.boot.info.ProcessInfo.MemoryInfo.MemoryUsageInfo;
 import org.springframework.boot.info.ProcessInfo.VirtualThreadsInfo;
-import org.springframework.util.ClassUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -58,22 +59,22 @@ void memoryInfoIsAvailable() {
 	}
 
 	@Test
-	void virtualThreadsInfoIsNullWhenMXBeanIsNotAccessible() {
-		if (ClassUtils.isPresent("jdk.management.VirtualThreadSchedulerMXBean", null)) {
-			ProcessInfo processInfo = new ProcessInfo();
-
-			VirtualThreadsInfo virtualThreadsInfo = processInfo.getVirtualThreads();
-
-			assertThat(virtualThreadsInfo).isNotNull();
-			assertThat(virtualThreadsInfo.getMounted()).isGreaterThanOrEqualTo(0);
-			assertThat(virtualThreadsInfo.getQueued()).isGreaterThanOrEqualTo(0);
-			assertThat(virtualThreadsInfo.getParallelism()).isGreaterThan(0);
-			assertThat(virtualThreadsInfo.getPoolSize()).isGreaterThan(0);
-		} else {
-			ProcessInfo processInfo = new ProcessInfo();
+	@EnabledForJreRange(min = JRE.JAVA_24)
+	void virtualThreadsInfoIfAvailable() {
+		ProcessInfo processInfo = new ProcessInfo();
+		VirtualThreadsInfo virtualThreadsInfo = processInfo.getVirtualThreads();
+		assertThat(virtualThreadsInfo).isNotNull();
+		assertThat(virtualThreadsInfo.getMounted()).isGreaterThanOrEqualTo(0);
+		assertThat(virtualThreadsInfo.getQueued()).isGreaterThanOrEqualTo(0);
+		assertThat(virtualThreadsInfo.getParallelism()).isGreaterThan(0);
+		assertThat(virtualThreadsInfo.getPoolSize()).isGreaterThanOrEqualTo(0);
+	}
 
-			assertThat(processInfo.getVirtualThreads()).isNull();
-		}
+	@Test
+	@EnabledForJreRange(max = JRE.JAVA_23)
+	void virtualThreadsInfoIfNotAvailable() {
+		ProcessInfo processInfo = new ProcessInfo();
+		assertThat(processInfo.getVirtualThreads()).isNull();
 	}
 
 }