fileupload, uploadItem getData is null

[richface_number1]

Hi i tried fileupload demo , but i can not getdata of uploaded filebecause it is null, bytes of UploadItem return null.
listener method

public synchronized void listener(UploadEvent event) throws Exception{
 UploadItem item = event.getUploadItem();
 File file = new File();
 file.setName(item.getFileName());
 file.setData(item.getData());
 Object obj = this.getFiles().get(0);
 System.out.println (this.getFiles().size());

 }

jsp file

<h:form>
 <h:panelGrid columns="2" columnClasses="top,top">
 <rich:fileUpload fileUploadListener="#{fileUploadBean.listener}"
 maxFilesQuantity="#{fileUploadBean.uploadsAvailable}"
 id= "upload" acceptedTypes="jpg, gif, png, bmp" uploadData="#{fileUploadBean.files}">

 </rich:fileUpload>

 </h:panelGrid>
 </h:form>

[richface_number1]

I solved this problem. I forget to config createTempFiles parameter in web.xml. I set it by false.