Strange problem with Taha's AjaxUpload

[Rural Hunter]

I'm using Tapestry 5.3.3 and AjaxUpload comp blogged by Taha here: 
http://tawus.wordpress.com/2011/06/25/ajax-upload-for-tapestry/
Everything works fine but there is a strange problem. Sometimes the file 
uploaded is alwasy empty(size 0). I checked 
AjaxFileUploadDecoderImpl.setupUploadedFile and suspected the problem is 
in TapestryInternalUtils.copy. So I tried to read the inputstream of the 
request myself. But strangely I always got return value -1 when I call 
the inputream.read when the problem happens. Looks the inputstream is 
totally empty. I checked the request sent by browser with firebug and 
can see the content is sent by post. Don't know why I just can not read 
it at server end.
One more interesting thing is that, this problem only happens sometimes 
after tomcat6 is recycled. Fore example, I recycle tomcat 10 times and 
only get problem with 1 time. With that recycle, all the file upload 
fails. The problelm persists until I recycle tomcat again. With a good 
recycle, the problem doesn't happen at all. I tested this on several 
machines with different tomcat versions and see the same problem on all 
of them. I can not get any clue and hope someone could give me some 
light.  Thanks in advance.

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