执行sh show-busy-java-threads.sh -F报错

[shenwenxin]

是我用户权限的问题吗？

Fail to jstack busy(0.1%) thread(40956/0x9ffc) stack of java process(40946) under user(root).

Error attaching to process: Doesn't appear to be a HotSpot VM (could not find symbol "gHotSpotVMTypes" in remote process)
sun.jvm.hotspot.debugger.DebuggerException: Doesn't appear to be a HotSpot VM (could not find symbol "gHotSpotVMTypes" in remote process)
	at sun.jvm.hotspot.HotSpotAgent.setupVM(HotSpotAgent.java:411)
	at sun.jvm.hotspot.HotSpotAgent.go(HotSpotAgent.java:305)
	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.JStack.main(JStack.java:92)
	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.jstack.JStack.runJStackTool(JStack.java:

[wangdongsong]

你主机上有JVM进程吗？

[oldratlee]

@shenwenxin 首先，不要用sh执行，详见说明 #57 (comment)

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Error attaching to process: Doesn't appear to be a HotSpot VM (could not find symbol "gHotSpotVMTypes" in remote process)
sun.jvm.hotspot.debugger.DebuggerException: Doesn't appear to be a HotSpot VM (could not find symbol "gHotSpotVMTypes" in remote process)
	at sun.jvm.hotspot.HotSpotAgent.setupVM(HotSpotAgent.java:411)
	at sun.jvm.hotspot.HotSpotAgent.go(HotSpotAgent.java:305)
	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.JStack.main(JStack.java:92)
	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.jstack.JStack.runJStackTool

看起来是 执行 jstack出错了，比如

• 被jsatck的Java进程坏掉了。
• jstack的版本过低、被jsatck的Java进程的Java版本不兼容

之类。

可以先直接用 jstack命令去操作一下 这个 Java进程 试试，再分析原因。

[oldratlee]

@shenwenxin 另外给一下运行过程日志

$ bash -x show-busy-java-threads

# 或是 
$ sudo bash -x show-busy-java-threads