使用java代码获取JVM信息

接快背 · 前天 21:54

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　　最近在环境中定位服务问题，由于服务使用的docker部署的，且使用的docker镜像，在启动之后，容器内没有jdk相关的工具【jstat、jmap等等】；于是采用在项目中使用java类获取jvm相关信息，以下是测试的示例：

import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;
import java.lang.management.MemoryUsage;
import java.lang.management.GarbageCollectorMXBean;
import java.lang.management.MemoryPoolMXBean;
import java.lang.management.ThreadMXBean;
import java.util.List;
public class GCInfoDemo {
public static void main(String[] args) {
// 获取内存管理 bean
MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();
MemoryUsage heapMemoryUsage = memoryMXBean.getHeapMemoryUsage();
MemoryUsage nonHeapMemoryUsage = memoryMXBean.getNonHeapMemoryUsage();
// 打印内存信息
System.out.println("Heap Memory Usage:");
System.out.println(" Init: " + heapMemoryUsage.getInit() / (1024 * 1024) + " MB");
System.out.println(" Used: " + heapMemoryUsage.getUsed() / (1024 * 1024) + " MB");
System.out.println(" Committed: " + heapMemoryUsage.getCommitted() / (1024 * 1024) + " MB");
System.out.println(" Max: " + heapMemoryUsage.getMax() / (1024 * 1024) + " MB");
System.out.println("\nNon-Heap Memory Usage:");
System.out.println(" Init: " + nonHeapMemoryUsage.getInit() / (1024 * 1024) + " MB");
System.out.println(" Used: " + nonHeapMemoryUsage.getUsed() / (1024 * 1024) + " MB");
System.out.println(" Committed: " + nonHeapMemoryUsage.getCommitted() / (1024 * 1024) + " MB");
System.out.println(" Max: " + nonHeapMemoryUsage.getMax() / (1024 * 1024) + " MB");
// 获取垃圾回收回收器 bean 的列表
List<GarbageCollectorMXBean> gcBeans = ManagementFactory.getGarbageCollectorMXBeans();
System.out.println("\nGarbage Collectors:");
for (GarbageCollectorMXBean gcBean : gcBeans) {
System.out.println(" Name: " + gcBean.getName());
System.out.println(" Number of collections: " + gcBean.getCollectionCount());
System.out.println(" Total time spent in collections: " + gcBean.getCollectionTime() + " ms");
}
// 打印内存池信息
System.out.println("\nMemory Pools:");
for (MemoryPoolMXBean memoryPool : ManagementFactory.getMemoryPoolMXBeans()) {
System.out.println(" Name: " + memoryPool.getName());
System.out.println(" Usage: " + memoryPool.getUsage());
}
// 获取线程管理 bean
ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
// 获取所有线程 ID
long[] threadIds = threadMXBean.getAllThreadIds();
System.out.println("\nThreads Information:");
for (long threadId : threadIds) {
System.out.println(" Thread ID: " + threadId);
System.out.println(" Thread Name: " + threadMXBean.getThreadInfo(threadId).getThreadName());
System.out.println(" Thread State: " + threadMXBean.getThreadInfo(threadId).getThreadState());
}
// 检查死锁线程
long[] deadlockedThreads = threadMXBean.findDeadlockedThreads();
if (deadlockedThreads != null) {
System.out.println("\nDeadlocked Threads:");
for (long deadlockedThreadId : deadlockedThreads) {
System.out.println(" Deadlocked Thread ID: " + deadlockedThreadId);
System.out.println(" Thread Name: " + threadMXBean.getThreadInfo(deadlockedThreadId).getThreadName());
}
} else {
System.out.println("\nNo deadlocked threads found.");
}
}
}

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获取GC信息
- 通过ManagementFactory.getGarbageCollectorMXBeans()获取所有垃圾回收器的监控Bean。
- 每个GarbageCollectorMXBean提供：
  - getName()：GC算法名称（如G1 Young Generation）
  - getCollectionCount()：回收次数
  - getCollectionTime()：累计耗时（毫秒）

　　 2.打印当前线程信息：

- 使用 ThreadMXBean 获取当前线程的所有 ID，并通过 getThreadInfo 方法获取每个线程的信息，包括线程名字和状态。

　　 3.检查死锁线程：

- 使用 findDeadlockedThreads 方法检查 JVM 中的死锁情况。如果有死锁线程，则输出这些线程的 ID 和名称。如果没有，则输出相应的消息。

Heap Memory Usage:
Init: 508 MB
Used: 10 MB
Committed: 487 MB
Max: 7205 MB
Non-Heap Memory Usage:
Init: 2 MB
Used: 4 MB
Committed: 7 MB
Max: 0 MB
Garbage Collectors:
Name: PS Scavenge
Number of collections: 0
Total time spent in collections: 0 ms
Name: PS MarkSweep
Number of collections: 0
Total time spent in collections: 0 ms
Memory Pools:
Name: Code Cache
Usage: init = 2555904(2496K) used = 1235968(1207K) committed = 2555904(2496K) max = 251658240(245760K)
Name: Metaspace
Usage: init = 0(0K) used = 3597432(3513K) committed = 4980736(4864K) max = -1(-1K)
Name: Compressed Class Space
Usage: init = 0(0K) used = 392584(383K) committed = 524288(512K) max = 1073741824(1048576K)
Name: PS Eden Space
Usage: init = 133169152(130048K) used = 10914704(10658K) committed = 133169152(130048K) max = 2789212160(2723840K)
Name: PS Survivor Space
Usage: init = 22020096(21504K) used = 0(0K) committed = 22020096(21504K) max = 22020096(21504K)
Name: PS Old Gen
Usage: init = 355467264(347136K) used = 0(0K) committed = 355467264(347136K) max = 5666504704(5533696K)
Threads Information:
Thread ID: 6
Thread Name: Monitor Ctrl-Break
Thread State: RUNNABLE
Thread ID: 5
Thread Name: Attach Listener
Thread State: RUNNABLE
Thread ID: 4
Thread Name: Signal Dispatcher
Thread State: RUNNABLE
Thread ID: 3
Thread Name: Finalizer
Thread State: WAITING
Thread ID: 2
Thread Name: Reference Handler
Thread State: WAITING
Thread ID: 1
Thread Name: main
Thread State: RUNNABLE
No deadlocked threads found.
Process finished with exit code 0

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