create another servlet in gwt project

hi, i have a problem with gwt project. i write my first web
application in gwt. my application should permit a client to send a
file to a server. i see the fileUpload e gwt Upload but i'm not able
to send file. i have the class that extends remoteserviceservlet that
have various methods that i write that work. in this class i override
the method dopost, to send a file? i try but this not work.
or i just create a servlet in the package of server and this servlet
receive the file sent by client. i try in this way but nothing. please
help me

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