content: package org.aion.utils;
  
  import com.sun.management.HotSpotDiagnosticMXBean;
  import java.lang.management.ManagementFactory;
  import javax.management.MBeanServer;
  
  /**
   * Source code form
   * <b>https://blogs.oracle.com/sundararajan/programmatically-dumping-heap-from-java-applications</b>.
   *
   * <p>To analyse the report call <code>jhat filename.hprof</code> and open
   * <b>http://localhost:7000/</b>.
   */
  public class HeapDumper {
      // This is the name of the HotSpot Diagnostic MBean
      private static final String HOTSPOT_BEAN_NAME = "com.sun.management:type=HotSpotDiagnostic";
      // Field to store the hotspot diagnostic MBean
      private static volatile HotSpotDiagnosticMXBean hotspotMBean;
  
      /**
       * Call this method from your application whenever you want to dump the heap snapshot into a
       * file.
       *
       * @param fileName name of the heap dump file
       * @param live flag that tells whether to dump only the live objects
       */
      public static void dumpHeap(String fileName, boolean live) {
          // initialize hotspot diagnostic MBean
          initHotspotMBean();
          try {
              hotspotMBean.dumpHeap(fileName, live);
          } catch (RuntimeException re) {
              throw re;
          } catch (Exception exp) {
              throw new RuntimeException(exp);
          }
      }
  
      // initialize the hotspot diagnostic MBean field
      private static void initHotspotMBean() {
          if (hotspotMBean == null) {
              synchronized (HeapDumper.class) {
                  if (hotspotMBean == null) {
                      hotspotMBean = getHotspotMBean();
                  }
              }
          }
      }
  
      // get the hotspot diagnostic MBean from the
      // platform MBean server
      private static HotSpotDiagnosticMXBean getHotspotMBean() {
          try {
              MBeanServer server = ManagementFactory.getPlatformMBeanServer();
              HotSpotDiagnosticMXBean bean =
                      ManagementFactory.newPlatformMXBeanProxy(
                              server, HOTSPOT_BEAN_NAME, HotSpotDiagnosticMXBean.class);
              return bean;
          } catch (RuntimeException re) {
              throw re;
          } catch (Exception exp) {
              throw new RuntimeException(exp);
          }
      }
  
      /** Example of class usage. */
      public static void main(String[] args) {
          // default heap dump file name
          String fileName = "heap.bin.hprof";
          // by default dump only the live objects
          boolean live = true;
          // simple command line options
          switch (args.length) {
              case 2:
                  live = args[1].equals("true");
              case 1:
                  fileName = args[0];
          }
          // dump the heap
          dumpHeap(fileName, live);
      }
  }
  