!7

p-exp {
  HotSpotDiagnosticMXBean bean = ManagementFactory.getPlatformMXBean(HotSpotDiagnosticMXBean.class);
  print("PrintGCDetails=" + bean.getVMOption("PrintGCDetails"));
  bean.setVMOption("PrintGCDetails", "true");
  print("PrintGCDetails=" + bean.getVMOption("PrintGCDetails"));
}