Java support for jstack

[Brian Gardner]

Yes.  This is a requirement for the openjdk6 implementation

On Oct 13, 2009, at 2:46 PM, Ronald Klop wrote:

> On Tue, 13 Oct 2009 13:45:49 +0200, Victor Balada Diaz <v.balada at coolbleiben.net 
> > wrote:
>
>> Hello Ronald,
>>
>> I tried openjdk jstack against diablo-jdk and it doesn't work, so
>> i just tried using tomcat with openjdk and when running jstack i
>> get the following error:
>>
>> yac# /usr/local/openjdk6/bin/jstack -F -l 89291
>> Attaching to process ID 89291, please wait...
>> Debugger attached successfully.
>> Server compiler detected.
>> JVM version is 11.0-b17
>> Deadlock Detection:
>>
>> No deadlocks found.
>>
>> Thread -1924730496: (state = BLOCKED)
>> Error occurred during stack walking:
>> sun.jvm.hotspot.debugger.DebuggerException:
>> sun.jvm.hotspot.debugger.DebuggerException: get_thread_regs failed  
>> for a
>> lwp
>>        at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal
>> $BsdDebuggerLocalWorkerThread.execute(BsdDebuggerLocal.java:152)
>>        at
>> sun 
>> .jvm 
>> .hotspot 
>> .debugger 
>> .bsd 
>> .BsdDebuggerLocal.getThreadIntegerRegisterSet(BsdDebuggerLocal.java: 
>> 455)
>>        at
>> sun.jvm.hotspot.debugger.bsd.BsdThread.getContext(BsdThread.java:65)
>>        at
>> sun 
>> .jvm 
>> .hotspot 
>> .runtime 
>> .bsd_amd64 
>> .BsdAMD64JavaThreadPDAccess 
>> .getCurrentFrameGuess(BsdAMD64JavaThreadPDAccess.java:92)
>>        at
>> sun 
>> .jvm 
>> .hotspot.runtime.JavaThread.getCurrentFrameGuess(JavaThread.java:252)
>>        at
>> sun 
>> .jvm 
>> .hotspot.runtime.JavaThread.getLastJavaVFrameDbg(JavaThread.java:214)
>>        at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:76)
>>        at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:45)
>>        at sun.jvm.hotspot.tools.JStack.run(JStack.java:60)
>>        at sun.jvm.hotspot.tools.Tool.start(Tool.java:221)
>>        at sun.jvm.hotspot.tools.JStack.main(JStack.java:86)
>>        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:616)
>>        at sun.tools.jstack.JStack.runJStackTool(JStack.java:136)
>>        at sun.tools.jstack.JStack.main(JStack.java:102)
>> Caused by: sun.jvm.hotspot.debugger.DebuggerException:  
>> get_thread_regs
>> failed for a lwp
>>        at
>> sun 
>> .jvm 
>> .hotspot 
>> .debugger.bsd.BsdDebuggerLocal.getThreadIntegerRegisterSet0(Native  
>> Method)
>>        at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal.access
>> $800(BsdDebuggerLocal.java:51)
>>        at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal
>> $1GetThreadIntegerRegisterSetTask.doit(BsdDebuggerLocal.java:449)
>>        at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal
>> $BsdDebuggerLocalWorkerThread.run(BsdDebuggerLocal.java:127)
>>
>> Locked ownable synchronizers:
>>    - None
>>
>> [... same error for all the other threads ...]
>>
>> Also if i try to use it without -F i get the following error:
>>
>> /usr/local/openjdk6/bin/jstack  89291
>> 89291: Unable to open socket file: target process not responding or
>> HotSpot VM not loaded
>> The -F option can be used when the target process is not responding
>>
>> Do you have any ideas on what could be wrong?
>>
>> Thanks a lot.
>> Regards.
>>
>> On Sat, 2009-10-03 at 16:11 +0200, Ronald Klop wrote:
>>> Jstack works in openjdk6.
>>> Also on a program running in another jdk if I remember it correct.
>>>
>>> Ronald.
>>>
>>> On Thu, 01 Oct 2009 14:42:02 +0200, Victor Balada Diaz
>>> <v.balada at coolbleiben.net> wrote:
>>>
>>> > Hello,
>>> >
>>> > I'm trying to use jstack in a FreeBSD 7.1-RELEASE-p7 amd64 with
>>> > diablo-jdk-1.6.0.07.02_3 but i always get the following error:
>>> >
>>> > $PID: no providers installed
>>> >
>>> > I saw a mail in 2007 asking about what would be needed to make it
>>> > work, but no answers. Is there any work in progress to make  
>>> jstack work?
>>> > What's needed and how can i help?
>>> >
>>> > Thanks in advance.
>>> > Regards.
>>> >
>
> Do you run jstack as the same user as the java process?
>
> Ronald.
>
>
>
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