[Building Sakai] [Sakai] File Upload - multipart Error

[nhbt]

Hello,

I'm using Wicket's FileUploadField to upload files. When on form submit 
it gets uploaded file

//uploadField.getFileUpload()

but it gives

//ERROR - MultipartFormInputStream   - Error while reading servlet 
request multi-part data: Stream ended unexpectedly. 
//boundary='-----------------------------1653863054147782203670627553535'; 
bufSize=4096

Exactly same file upload form in simple Wicket project without Sakai, it 
worked.
I googled, but this issue is mainly for glassfish, they're saying in 
tomcat it will be ok.
Is there any Sakai related config? or am I missing something?

tomcat 7
wicket 1.4
sakai trunk

Thanks,