Upload file in a primefaces page

Luigi

GOAL: test uploading files to a fronend page developed with primefaces.

Script sahi (with a standard html form, it works! but in primefaces doesn't work)

_setFile(_file("idform"), "C:\\path\\file.pdf");
_call(_file("idform").type = "text");
_setValue(_textbox("idform"), "C:\\path\\file.pdf");

example form to upload file with primafaces:

<h:form>
<p:fileUpload fileUploadListener="#{fileUploadView.handleFileUpload}" mode="advanced" dragDropSupport="false"
multiple="true" update="messages" sizeLimit="100000" fileLimit="3" allowTypes="/(\.|\/)(pdf)$/" />

<p:growl id="messages" showDetail="true" />
</h:form>

running the script, I see in the page for a short time the file that is loaded (it seems to be loaded) but actually nothing is loaded, because on the backend side (in the spring controller) no file arrives.
Any suggestions?

thanks
Luigi