netui:fileupload

Hi all,

i'm having some trouble with the fileupload tag. I'm always
getting a 
null value from the FormFile attribute.
The multipart handler is set to "memory"
the enctype is set to "multipart/form-data" in the
netui form

Where is my problem ?
Do i have to upgrade from commons-fileupload-1.0.jar to 1.2
?

Thx

Emmanuel