[xwiki-users] Cannot use FileUploadPlugin !?

Hi, I want to create a page allowed to upload more files together using FileUploadPlugin. I created 2 documents but the FileUploadPlugin seems not work, the data return is null and the document MySpace.Upload is attached with a file 0KB. Anyone can explain me why this happens ? And how to fix ? 1. MySpace.doc: <form action="/xwiki/bin/view/MySpace/Upload" enctype="multipart/form-data" method="post"> <input type="file" name="filepath" value="" size="40" /> <input type="submit" value="Save" /> </form> 2. MySpace.Upload <% import com.xpn.xwiki.plugin.fileupload.FileUploadPlugin; import com.xpn.xwiki.doc.XWikiDocument; import com.xpn.xwiki.doc.XWikiAttachment; print "Start upload... "; def docu=doc.getDocument(); FileUploadPlugin fileupload = (FileUploadPlugin) context.getContext().get("fileuploadplugin"); byte[] data = fileupload.getFileItemData("filepath", context.getContext()); def filename = "myfile"; def attachment = docu.getAttachment(filename); print data; if (!attachment) { attachment = new XWikiAttachment(docu, filename); docu.getAttachmentList().add(attachment); } attachment.setContent(data); docu.saveAttachmentContent(attachment, context.getContext()); doc.save() println "done" %>