JVM內存模型和性能調優：JVM調優工具詳解及調優實戰：Jstack - 第37篇

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一、用jstack加進程id查找死鎖

         用jstack加進程id查找死鎖，見如下示例DeadLockTest：

public class DeadLockTest {

   private static Object lock1 = new Object();
   private static Object lock2 = new Object();

   public static void main(String[] args) {
      new Thread(() -> {
         synchronized (lock1) {
            try {
               System.out.println("thread1 begin");
               Thread.sleep(5000);
            } catch (InterruptedException e) {
            }
            synchronized (lock2) {
               System.out.println("thread1 end");
            }
         }
      }).start();

      new Thread(() -> {
         synchronized (lock2) {
            try {
               System.out.println("thread2 begin");
               Thre