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So I got a Primefaces portlet with a p:fileUpload tag in it. Everything seems to work fine without having to modify my web.xml or pom.xml file to include fileUpload specific stuff.  I was hoping the include the thresholdSize parameter in my web.xml in order not write files to disk that when they're less then 1mb.  However I'm not finding the magic sauce yet to make that work.  I first tried adding the following to my web.xml file:

&nbsp;&nbsp; &nbsp;<context-param>
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;<param-name>primefaces.UPLOADER</param-name>
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;<param-value>commons</param-value>
&nbsp;&nbsp; &nbsp;</context-param>
&nbsp;&nbsp; &nbsp;<servlet>
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;<servlet-name>Faces Servlet</servlet-name>
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;<load-on-startup>1</load-on-startup>
&nbsp;&nbsp; &nbsp;</servlet>
&nbsp;&nbsp; &nbsp;<filter>
&nbsp;&nbsp; &nbsp; &nbsp; &nbsp;<filter-name>PrimeFaces FileUpload Filter</filter-name>
&nbsp;&nbsp; &nbsp; &nbsp; &nbsp;<filter-class>
&nbsp;&nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;org.primefaces.webapp.filter.FileUploadFilter
&nbsp;&nbsp; &nbsp; &nbsp; &nbsp;</filter-class>
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;<init-param>
&nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;<param-name>thresholdSize</param-name>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp;<param-value>1000000</param-value>
&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;</init-param>&nbsp;&nbsp; &nbsp; &nbsp; &nbsp;
&nbsp;&nbsp; &nbsp;</filter>
&nbsp;&nbsp; &nbsp;<filter-mapping>
&nbsp;&nbsp; &nbsp; &nbsp; &nbsp;<filter-name>PrimeFaces FileUpload Filter</filter-name>
&nbsp;&nbsp; &nbsp; &nbsp; &nbsp;<servlet-name>Faces Servlet</servlet-name>
&nbsp;&nbsp; &nbsp;</filter-mapping>

Of course the servlet tag was already there but my files still get written to liferay's tomcat's temp folder. So I tried adding the following to my .xhtml view file

<h:form id="taskForm" enctype="multipart/form-data"         onkeypress="if (event.keyCode == 13) { return false; }">
</h:form>

This ensures the encoding type is multipart for the form enclosing the fileUpload.  I didn't to need before as well.I also tried adding the following to my portlet pom.xml:

&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;<dependency>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <groupid>commons-fileupload</groupid>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <artifactid>commons-fileupload</artifactid>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <version>1.3.1</version>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <optional>true</optional>
&nbsp; &nbsp; &nbsp; &nbsp; </dependency>
&nbsp; &nbsp; &nbsp; &nbsp; <dependency>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <groupid>commons-io</groupid>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <artifactid>commons-io</artifactid>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <version>2.4</version>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <optional>true</optional>
&nbsp; &nbsp; &nbsp; &nbsp; </dependency>

None of these changes seem to help to stop the upload files from getting temporarily stored in the file system. Finally here's what my fileUpload tag looks like:

<p:fileupload id="extractionCSVUpload"       update=":taskForm:tasksTable"  rendered="#{tasksView.selectedTask.reviewType == 'csv'}"  disabled="#{tasksView.selectedTask == null || tasksView.isCurrentAssignee() == false}"  fileUploadListener="#{tasksView.handleFileUpload}"  mode="advanced" skinSimple="true" auto="true" label="CSV" />
​​​​​​​

Any help would be greatly appreciated.