Java EE (Java Enterprise Edition) General Discussion

Hi
I am trying to upload a file from the client to the server. I am using oReilley's MultipartRequest to do this. This works fine in my Test Environment in Visual Age. But does not work in Websphere App Server.
I get a "Error during native read operation". This happens mostly for big files more than 2 MB and sometimes for small files as well.
Is this is a server issue? ('cos i tried using from jspsmart File Uplaod class and the result was the same).
Any help is greatly appreciated.

Thank You