解决jmap命令打印JVM堆信息异常的问题

Attaching to process ID 19560, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 24.79-b02
 
using thread-local object allocation.
Parallel GC with 33 thread(s)
 
Heap Configuration:
  MinHeapFreeRatio = 0
  MaxHeapFreeRatio = 100
  MaxHeapSize   = 32038191104 (30554.0MB)
  NewSize     = 1310720 (1.25MB)
  MaxNewSize    = 17592186044415 MB
  OldSize     = 5439488 (5.1875MB)
  NewRatio     = 2
  SurvivorRatio  = 8
  PermSize     = 21757952 (20.75MB)
  MaxPermSize   = 174063616 (166.0MB)
  G1HeapRegiOnSize= 0 (0.0MB)
 
Heap Usage:
Exception in thread "main" java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at sun.tools.jmap.JMap.runTool(JMap.java:197)
    at sun.tools.jmap.JMap.main(JMap.java:128)
Caused by: java.lang.RuntimeException: unknown CollectedHeap type : class sun.jvm.hotspot.gc_interface.CollectedHeap
    at sun.jvm.hotspot.tools.HeapSummary.run(HeapSummary.java:146)
    at sun.jvm.hotspot.tools.Tool.start(Tool.java:221)
    at sun.jvm.hotspot.tools.HeapSummary.main(HeapSummary.java:40)
    ... 6 more

Attaching to process ID 19560, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 24.79-b02
 
using thread-local object allocation.
Parallel GC with 33 thread(s)
 
Heap Configuration:
  MinHeapFreeRatio = 0
  MaxHeapFreeRatio = 100
  MaxHeapSize   = 32038191104 (30554.0MB)
  NewSize     = 1310720 (1.25MB)
  MaxNewSize    = 17592186044415 MB
  OldSize     = 5439488 (5.1875MB)
  NewRatio     = 2
  SurvivorRatio  = 8
  PermSize     = 21757952 (20.75MB)
  MaxPermSize   = 174063616 (166.0MB)
  G1HeapRegiOnSize= 0 (0.0MB)
 
Heap Usage:
PS Young Generation
Eden Space:
  capacity = 537919488 (513.0MB)
  used   = 532557632 (507.88653564453125MB)
  free   = 5361856 (5.11346435546875MB)
  99.00322332252071% used
From Space:
  capacity = 89128960 (85.0MB)
  used   = 0 (0.0MB)
  free   = 89128960 (85.0MB)
  0.0% used
To Space:
  capacity = 89128960 (85.0MB)
  used   = 0 (0.0MB)
  free   = 89128960 (85.0MB)
  0.0% used
PS Old Generation
  capacity = 1431306240 (1365.0MB)
  used   = 844440 (0.8053207397460938MB)
  free   = 1430461800 (1364.194679260254MB)
  0.058997856391655217% used
PS Perm Generation
  capacity = 22020096 (21.0MB)
  used   = 8512616 (8.118263244628906MB)
  free   = 13507480 (12.881736755371094MB)
  38.65839640299479% used
 
3145 interned Strings occupying 252104 bytes.

private Object lock1 = new Object();
private Object lock2 = new Object();
public  String deadlock() {
   new Thread(() -> {
  synchronized(lock1) {
  synchronized(lock1) {System.out.println(“Thread1 get lock1”)}
  try{Thread.sleep(5000);}cache(Exception e){}
  synchronized(lock2) {System.out.println(“Thread1 get lock2”)}
}
}).start();
new Thread(() -> {
  synchronized(lock2) {
  synchronized(lock1) {System.out.println(“Thread2 get lock2”)}
  try{Thread.sleep(5000);}cache(Exception e){}
  synchronized(lock1) {System.out.println(“Thread2 get lock1”)}
}
}).start();
}