I have a rich:fileUpload component in one of my pages, I want my users to be able to upload a CSV file to the server. Here is the page source :

<a4j:outputPanel id="ajxBlackList_19">
 <h:inputText id="property_BLACK_LIST" value="#{eventCreation.currentEvent.blackList}" />
</a4j:outputPanel>

<h:outputText id="houtputText_24" value="Charger les valeurs via un fichier CSV :" />
<rich:fileUpload id="black_list_upload" fileUploadListener="#{eventCreation.listener}" listHeight="200" immediateUpload="false" acceptedTypes="csv,txt">
 <a4j:support id="a4jsupport_27" event="onuploadcomplete" reRender="ajxBlackList_19" />
 </rich:fileUpload>
<h:message id="hmessage_29" tooltip="true" for="black_list_upload" style="color: red;" />

And here is the code of my bean listener (which is never called) :

 private UploadItem csvItem;

 [...]

 public synchronized void listener(UploadEvent event) {

 this.setCsvItem( event.getUploadItem() );

 // retrieve component id for later use
 UIComponent fromComponent = event.getComponent();
 String componentId = fromComponent.getId();

 String content = null;

 // file reading
 if (getCsvItem().isTempFile()) {
 File csvFile = getCsvItem().getFile();
 StringBuilder fileData = new StringBuilder();

 try {

 BufferedReader reader = new BufferedReader(new FileReader(csvFile));
 char[] buf = new char[1024];
 int numRead=0;

 while((numRead=reader.read(buf)) != -1){
 fileData.append(buf, 0, numRead);
 }

 reader.close();

 } catch(Exception e) {
 addErrorMessage(e.getMessage(), componentId);
 return;
 }
 content = fileData.toString();

 } else {
 content = new String(getCsvItem().getData());
 }
 this.getCurrentEvent().getProperty(DrawingLotsEvent.PROPERTY_WHITE_LIST).setValue(content);

 }

Every time I try to upload a file, I get an instant error "Transfer error occured" without my listener being called. I have no trace of any error in a4j log window.

I put this in my web.xml as suggested :

 <filter>
 <display-name>Ajax4jsf Filter</display-name>
 <filter-name>ajax4jsf</filter-name>
 <filter-class>org.ajax4jsf.Filter</filter-class>
 <init-param>
 <param-name>createTempFiles</param-name>
 <param-value>true</param-value>
 </init-param>
 <init-param>
 <param-name>maxRequestSize</param-name>
 <param-value>1000000</param-value>
 </init-param>
 </filter>

Anyone has any idea ? Or maybe a way to debug this component so I could know WHY this error occurs ?

Thanks a lot.