mac使用jmap报错问题

安装的jdk版本是jdk1.8.0_201，使用jmap -heap时一直报错

Error attaching to process: sun.jvm.hotspot.debugger.DebuggerException: Can't attach symbolicator to the process
sun.jvm.hotspot.debugger.DebuggerException: sun.jvm.hotspot.debugger.DebuggerException: Can't attach symbolicator to the process
	at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal$BsdDebuggerLocalWorkerThread.execute(BsdDebuggerLocal.java:169)
	at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal.attach(BsdDebuggerLocal.java:287)
	at sun.jvm.hotspot.HotSpotAgent.attachDebugger(HotSpotAgent.java:671)
	at sun.jvm.hotspot.HotSpotAgent.setupDebuggerDarwin(HotSpotAgent.java:659)
	at sun.jvm.hotspot.HotSpotAgent.setupDebugger(HotSpotAgent.java:341)
	at sun.jvm.hotspot.HotSpotAgent.go(HotSpotAgent.java:304)
	at sun.jvm.hotspot.HotSpotAgent.attach(HotSpotAgent.java:140)
	at sun.jvm.hotspot.tools.Tool.start(Tool.java:185)
	at sun.jvm.hotspot.tools.Tool.execute(Tool.java:118)
	at sun.jvm.hotspot.tools.HeapSummary.main(HeapSummary.java:49)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at sun.tools.jmap.JMap.runTool(JMap.java:201)
	at sun.tools.jmap.JMap.main(JMap.java:130)
Caused by: sun.jvm.hotspot.debugger.DebuggerException: Can't attach symbolicator to the process
	at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal.attach0(Native Method)
	at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal.access$100(BsdDebuggerLocal.java:65)

网上查了一下是jdk的bug，切换到jdk9以上就不会报错了bug链接
把jdk环境变量设置为jdk11，使用jps查看当前运行的java

jps

42160 
42177 RemoteMavenServer36
38246 
42873 Bootstrap
42875 Jps
41515 XMLServerLauncher
42174 Launcher

Bootstrap为当前运行的tomcat

jmap -heap 42873

提示

Error: -heap option used
Cannot connect to core dump or remote debug server. Use jhsdb jmap instead

使用它提示的jhsdb jmap

jhsdb jmap --heap  --pid 42873

提示

Attaching to process ID 42873, please wait...
Error attaching to process: java.lang.RuntimeException: can't determine target's VM version : field "_reserve_for_allocation_prefetch" not found in type ThreadLocalAllocBuffer
sun.jvm.hotspot.debugger.DebuggerException: java.lang.RuntimeException: can't determine target's VM version : field "_reserve_for_allocation_prefetch" not found in type ThreadLocalAllocBuffer
	at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.setupVM(HotSpotAgent.java:436)
	at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.go(HotSpotAgent.java:306)
	at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.attach(HotSpotAgent.java:141)
	at jdk.hotspot.agent/sun.jvm.hotspot.tools.Tool.start(Tool.java:185)
	at jdk.hotspot.agent/sun.jvm.hotspot.tools.Tool.execute(Tool.java:118)
	at jdk.hotspot.agent/sun.jvm.hotspot.tools.JMap.main(JMap.java:176)
	at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.runJMAP(SALauncher.java:326)
	at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.main(SALauncher.java:455)
Caused by: java.lang.RuntimeException: can't determine target's VM version : field "_reserve_for_allocation_prefetch" not found in type ThreadLocalAllocBuffer
	at jdk.hotspot.agent/sun.jvm.hotspot.runtime.VM.<init>(VM.java:337)
	at jdk.hotspot.agent/sun.jvm.hotspot.runtime.VM.initialize(VM.java:429)
	at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.setupVM(HotSpotAgent.java:432)
	... 7 more

查一下其他的jvm发现是可以正常查看堆的使用情况

jhsdb jmap --heap  --pid 41515

Heap Configuration:
   MinHeapFreeRatio         = 40
   MaxHeapFreeRatio         = 70
   MaxHeapSize              = 4294967296 (4096.0MB)
   NewSize                  = 1363144 (1.2999954223632812MB)
   MaxNewSize               = 2576351232 (2457.0MB)
   OldSize                  = 5452592 (5.1999969482421875MB)
   NewRatio                 = 2
   SurvivorRatio            = 8
   MetaspaceSize            = 21807104 (20.796875MB)
   CompressedClassSpaceSize = 1073741824 (1024.0MB)
   MaxMetaspaceSize         = 17592186044415 MB
   G1HeapRegionSize         = 1048576 (1.0MB)

Heap Usage:
G1 Heap:
   regions  = 4096
   capacity = 4294967296 (4096.0MB)
   used     = 39947264 (38.0966796875MB)
   free     = 4255020032 (4057.9033203125MB)
   0.9300947189331055% used
G1 Young Generation:
Eden Space:
   regions  = 21
   capacity = 164626432 (157.0MB)
   used     = 22020096 (21.0MB)
   free     = 142606336 (136.0MB)
   13.375796178343949% used
Survivor Space:
   regions  = 4
   capacity = 4194304 (4.0MB)
   used     = 4194304 (4.0MB)
   free     = 0 (0.0MB)
   100.0% used
G1 Old Generation:
   regions  = 14
   capacity = 99614720 (95.0MB)
   used     = 13732864 (13.0966796875MB)
   free     = 85881856 (81.9033203125MB)
   13.785978618421053% used

使用jps -v查看运行jvm配置详细信息,发现除了tomcat是我们自己配置的jdk8其余的程序用的都是环境变量中的jdk11，应该是版本不一致导致的问题，将jdk版本换成同一个就可以了