Problem using payloadZipBean to unzip a file

I would like to run OS command to zip large amount of xml into one zip file before XI pick it up, then use unzip option in payloadZipBean to unzip all the xml files so XI can process them one by one from memory, this will reduce lots file I/O time.
But I am getting this warning message:
Warning Zip: message is empty or has no payload
But if I display this message in RWB, the only payload is this zip file.
Why the payloadZipBean is not unzipping this file as supposed to.

Did you check this blog
/people/stefan.grube/blog/2007/02/20/working-with-the-payloadzipbean-module-of-the-xi-adapter-framework
Sameer

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