Trouble for do file upload

I use <hx:fileupload> tag to do file upload, but it doesn't work.
I tye to find doc, but it doesn't talk more.
my code:
<h:form id="form1">
<hx:fileupload styleClass="fileupload" id="fileupload1" value="#{pc_Upload.uploadfile}" required="true">
<hx:fileProp name="fileName" value="#{pc_Upload.fileName}"/>
<hx:fileProp name="contentType" value="#{pc_Upload.mimeType}"/>
</hx:fileupload>
<h:message for="fileupload1"></h:message>
<h:commandButton value="upload" action="#{pc_Upload.doCommandButtonAction}"></h:commandButton>
</h:form>uploadfile is boolean , fileName and mimeType are String
I can't get fileName and mimeType in my backing bean and this give me a message for validator fails need value!, why?
where can I do something to let it work?
please tell me , thanks

it's still NullPointException
upload.jsp
<f:view>
     <BODY><hx:scriptCollector id="scriptCollector1">
     <P>Place content here.</P>
          <h:form styleClass="form" id="form1">
               <hx:fileupload styleClass="fileupload" id="fileupload1" binding="#{backingUpload.file}">
                    <hx:fileProp name="fileName" />
                    <hx:fileProp name="contentType" />
               </hx:fileupload>
               <hx:commandExButton type="submit" value="Submit"
                    styleClass="commandExButton" id="button1" action="#{backingUpload.update}"></hx:commandExButton>
          </h:form>
     </hx:scriptCollector></BODY>
</f:view>BackingUpload.java
import com.ibm.faces.component.html.HtmlFileupload;
import com.ibm.faces.fileupload.util.ContentElement;
public class BackingUpload {
     private HtmlFileupload file;
      * @return Returns the file.
     public HtmlFileupload getFile() {
          return file;
      * @param file The file to set.
     public void setFile(HtmlFileupload file) {
          this.file = file;
     public String update() {
          HtmlFileupload tmpFile = this.getFile();
          ContentElement content = (ContentElement)tmpFile.getValue();
          if (content == null) {
               System.out.println("is null!");
          return "update";
}now when I enter upload.jsp
console thows message to me, like this
[2006/6/20   21:28:34:370 CST] 0000002a ServletWrappe A   SRVE0242I: [JS Resource Servlet]: ��O��
[2006/6/20   21:28:34:542 CST] 0000002b WebContainer E   SRVE0232E: ��e�`��<br> ��r��[java.lang.NullPointerException
     at com.ibm.ws.webcontainer.srt.SRTServletResponse.setDefaultResponseEncoding(SRTServletResponse.java:610)
     at com.ibm.ws.webcontainer.srt.SRTServletResponse.start(SRTServletResponse.java:494)
     at com.ibm.ws.webcontainer.srt.SRTConnectionContext.start(SRTConnectionContext.java:48)
     at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:1654)
     at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:77)
     at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:421)
     at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:367)
     at com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpICLReadCallback.java:94)
     at com.ibm.ws.tcp.channel.impl.WorkQueueManager.requestComplete(WorkQueueManager.java:548)
     at com.ibm.ws.tcp.channel.impl.WorkQueueManager.attemptIO(WorkQueueManager.java(Compiled Code))
     at com.ibm.ws.tcp.channel.impl.WorkQueueManager.workerRun(WorkQueueManager.java:934)
     at com.ibm.ws.tcp.channel.impl.WorkQueueManager$Worker.run(WorkQueueManager.java:1021)
     at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1332)
]What do I set in web.xml and faces-config.xml, if I want to user fileupload?
or What can I do to it
please help me, thanks

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