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https://issues.apache.org/jira/browse/HTTPCLIENT-1681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14720648#comment-14720648
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Daniel Doubrovkine commented on HTTPCLIENT-1681:
------------------------------------------------

I chose to just let waffle loop over a size instead of hard-coding a bigger 
value. JNA still wants your pull request changing the default value with a nice 
explanation. Personally I think Waffle is doing the right thing so I didn't 
feel compelled changing the default in JNA myself.

> GPF occurs when WindowsNegotiateScheme.dispose() is called by garbage 
> collector
> -------------------------------------------------------------------------------
>
>                 Key: HTTPCLIENT-1681
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1681
>             Project: HttpComponents HttpClient
>          Issue Type: Bug
>          Components: HttpClient
>    Affects Versions: 4.5
>         Environment: Windows 7
>            Reporter: Alexander Bernstein
>
> I am using WindowsNegotiateScheme (created by WindowsNegotiateSchemeFactory) 
> to have my client authenticate using SPNEGO.
> During the auth dance, several instances of WindowsNegotiateScheme are 
> created. At a later time (arbitrary) these objects are finalized by GC, which 
> causes a GPF and a crash. 
> 1XMCURTHDINFO  Current thread
> NULL           ----------------------
> 3XMTHREADINFO      "Finalizer thread" J9VMThread:0x0000000003FD1B00, 
> j9thread_t:0x00000000050C1F10, java/lang/Thread:0x000007FFDE5E2800, state:R, 
> prio=5
> 3XMJAVALTHREAD            (java/lang/Thread getId:0x15, isDaemon:true)
> 3XMTHREADINFO1            (native thread ID:0xCBC, native priority:0x5, 
> native policy:UNKNOWN, vmstate:R, vm thread flags:0x00000000)
> 3XMTHREADINFO3           Java callstack:
> 4XESTACKTRACE                at com/sun/jna/Native.setPointer(Native Method)
> 4XESTACKTRACE                at 
> com/sun/jna/Pointer.setPointer(Pointer.java:1195)
> 4XESTACKTRACE                at com/sun/jna/Memory.setPointer(Memory.java:658)
> 4XESTACKTRACE                at com/sun/jna/Pointer.setValue(Pointer.java:937)
> 4XESTACKTRACE                at 
> com/sun/jna/Structure.writeField(Structure.java:800)
> 4XESTACKTRACE                at 
> com/sun/jna/Structure.write(Structure.java:718(Compiled Code))
> 4XESTACKTRACE                at 
> com/sun/jna/Structure.autoWrite(Structure.java:1923(Compiled Code))
> 4XESTACKTRACE                at 
> com/sun/jna/Function.convertArgument(Function.java:505(Compiled Code))
> 4XESTACKTRACE                at 
> com/sun/jna/Function.invoke(Function.java:297(Compiled Code))
> 4XESTACKTRACE                at 
> com/sun/jna/Library$Handler.invoke(Library.java:212)
> 4XESTACKTRACE                at 
> com/sun/proxy/$Proxy13.FreeCredentialsHandle(Bytecode PC:18)
> 4XESTACKTRACE                at 
> org/apache/http/impl/auth/win/WindowsNegotiateScheme.dispose(WindowsNegotiateScheme.java:99)
> 4XESTACKTRACE                at 
> org/apache/http/impl/auth/win/WindowsNegotiateScheme.finalize(WindowsNegotiateScheme.java:117)
> 4XESTACKTRACE                at 
> java/lang/J9VMInternals.runFinalize(J9VMInternals.java:436)
> 3XMTHREADINFO3           No native callstack available on this platform
> NULL



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