GPF in WindowsNegotiateScheme.dispose()

[al...@yahoo.com.INVALID]

Hello,
I am new here, please pardon if this is not the right place for this kind of question.
I am using httpclient-win-4.5 from httpClient 4.5 and jna-4.1.0/jna-platform-4.1.0 JNA libraries to authenticate to Kerberos server from Eclipse-based application. 
I create my client from WinHttpClients.custom(). The authentication is successful, but sooner or later, when JVM calls WindowsNegotiateScheme.dispose() my Eclipse crashes with GPF.
I noticed that WindowsNegotiateSchemeFactory.create() is called twice, for some reason. Not sure if this is a normal flow and/or is relevant to the problem.

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
Appreciate any help and suggestions.Thank you
Alex Bernstein