VB Process Does Not Shut Down After Attaching VM

I am using the axbridge with Java 1.5.0_02 to embed a swing GUI into a VB app. When I close the VB app, the window disappears, but the process is still running.
I believe that part of the reason why I've encountered this problem lies in the way the VB app is implemented. The app is a COM out-of-process server brought up from Excel using...
Object m_tool = CreateObject("VBapp.ToolClass").
To bring down the app, m_tool is set to "Nothing". COM then realizes that no one is holding a reference to anything in the server the VB app is running as, and the server is shut down by COM. Unfortunately, a thread still seems to be running, so the process doesn't die.
Doing a System.exit() or some other equivalent would certainly take care of the process, but it doesn't make sense for my addition to the greater application to descide when the application should be killed. I need Java to shut down cleanly.
Here's why I think Java is not shutting down cleanly. Upon inspecting the process, I find one thread that is still running. Here's a trace of the stack for that thread.
ntdll.dll!KiFastSystemCallRet
!SetWindowTextW+0x120
!CoUnmarshalInterface+0x13e2
!CoUnmarshalInterface+0x1509
!StgGetIFillLockBytesOnFile+0x10fea
!StgGetIFillLockBytesOnFile+0x109fe
!StgGetIFillLockBytesOnFile+0x108e2
!CoUnmarshalInterface+0x15b6
!CoUnmarshalInterface+0x155f
!DcomChannelSetHResult+0xd55
!NdrProxySendReceive+0x40
!NdrProxySendReceive+0x137
!NdrProxySendReceive+0xcd
!NdrComplexArrayMemorySize+0x695
!CoUnmarshalInterface+0x5bd
!CoUnmarshalInterface+0x55e
!DcomChannelSetHResult+0x993
!DcomChannelSetHResult+0x78c
!StringFromIID+0x194
!StringFromIID+0x175
!CoWaitForMultipleHandles+0xdc62
!OleInitialize+0x66c
!OleInitialize+0x5bf
!CoInitializeEx+0x2b6
!CoUninitialize+0x52
!Java_com_sun_deploy_util_UpdateCheck_handleUserResponse+0x743
ntdll.dll!LdrInitializeThunk+0x29
ntdll.dll!LdrShutdownProcess+0x142
!IsValidLocale+0x8eb
!ExitProcess+0x14
!ThunRTMain+0xae
Notice that it looks like we have a call from Java to native code going on.
Java_com_sun_deploy_util_UpdateCheck_handleUserResponse
I believe the UpdateCheck class has something to do with checking to see if there is a Java version update to be had, but I don't really know for sure. I've tried turning off the auto-update feature through the Java control panel, but that doesn't solve the problem. Does anyone have any info. that might shed some light on what's going on here?

I would definitely have given it longer than a minute.
OS X does quite a few things during a shutdown routine. It clears caches, updates them for the next boot, etc. Sometimes this process can take a bit, especially after software updates or major system changes.
Try shutting down again and see if the problem persists. If the computer doesn't turn off immediately, give it a few minutes before holding down the power button.

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