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I have to send file and their properties to GWT server. For sending a file i used form panel. public class BrowseFile extends DialogBox { // more code // .. private FormPanel getFormPanel() { if (formPanel == null) { formPanel = new FormPanel(); formPanel.setMethod(FormPanel.METHOD_POST); formPanel.setEncoding(FormPanel.ENCODING_MULTIPART); formPanel.setAction(GWT.getHostPageBaseURL() +"UploadFileServlet"); formPanel.addSubmitHandler(new FormPanel.SubmitHandler(){ public void onSubmit(SubmitEvent event) { // TODO Auto-generated method stub setFilename(fileUpload.getFilename()); } }); } return formPanel; } } all the properties of this file are in Hashmap there are 2 dialog box Propertybox extends DialogBox and BrowseFile extends DialogBox inside the constructor of PropertyBox there is BrowseFile When PropertyBox constructor setSize("600px", "670px"); setHTML("Add Document"); setWidget(getVerticalPanel()); browseFile = new BrowseFile(); The custom Property inside the PropertyBox depends on the class selected (Class is tree Widget) On Server Side public class FileUpload extends HttpServlet implements Servlet{ private static final long serialVersionUID = 1L; private static final Logger log = Logger.getLogger(FileUpload.class .getName()); protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException,

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