h:inputFile doesn't call Part setter - ajax

Question

This is my first time using h:inputFile and I'm having some trouble.
The setter method for the Part attribute in my Managed Bean is never being called, so when the upload method is called, the Part object is always null.
Form and inputFile component
<h:form enctype="multipart/form-data">
<div class="pic add-pic">
<h:inputFile id="upload-test" required="true"
value="#{uploadController.uploadedFile}">
</h:inputFile>
<h:commandLink styleClass="pic add-pic"
action="#{uploadController.addPic()}">
<i class="fa fa-plus"></i>
<span>Add pic</span>
</h:commandLink>
</div>
</h:form>
Managed Bean
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ViewScoped;
import javax.servlet.http.Part;
#ManagedBean
#ViewScoped
public class UploadController {
private Part uploadedFile;
public Part getUploadedFile() {
return this.uploadedFile;
}
public void setUploadedFile(Part uploadedFile) {
this.uploadedFile = uploadedFile;
}
public void addPic() {
System.out.println("Uploaded a file: " +
uploadedFile.getSubmittedFileName());
}
}
I've tried already with ajax in the inputFile
<h:inputFile id="upload-test" required="true"
value="#{uploadController.uploadedFile}">
<f:ajax execute="#form" listener="#{uploadController.addPic()}" />
</h:inputFile>
and with ajax in the commandLink
<h:commandLink styleClass="pic add-pic">
<i class="fa fa-plus"></i>
<span>Add pic</span>
<f:ajax execute="#form" listener="#{uploadController.addPic()}" />
</h:commandLink>
But neither options worked as well.
PS: I'm using javax.servlet-api version 3.1 and JSF 2.2.12 (Mojarra) and running on Wildfly 9.0.2
PS2: I'm using also Primefaces (not in this case), and I have the fileUpload filter in my web.xml (I've tried to remove it, tested and no success).

Answer 1

After several tries and after deploying a fresh project with only the defaults (just like #BalusC said in the comments of my question), I discovered that the problem was the PrimeFaces FileUploadFilter in web.xml!!
I got rid of it before, but I don't know why didn't worked that time, could've been some problem with the project deployment refresh provided by Eclipse.
But now I tried again and it worked!
Thanks #BalusC for your help!

Answer 2

Thanks BalusC and Diego Marques! I had a similar problem with my application, which was deployed on Tomcat 8 - the h:inputFile value "Part" setter was never called. Your help pointed me to some of my libraries which had already discovered that my issue was actually a Tomcat setting.
In case it helps to have it included here too, Tomcat (and likely Glassfish)needs the following setting to make it "spec-compliant".
<Context allowCasualMultipartParsing="true"
https://github.com/ocpsoft/rewrite/issues/136
Instead of doing the above context setting, you can have your bean marked with #MultipartConfig (and #WebServlet).