formpanel.submit does not submit the file on GWT server - gwt

Question

i want to send a file from client to server.
My code:
Client side:
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.setWidget(getFlexTable_1());
System.out.println(GWT.getHostPageBaseURL() +"UploadFileServlet");
}
return formPanel;
}
In getFlexTable_1()
flexTable.setWidget(1, 1, getFileUpload());
In getFileUpload()
private FileUpload getFileUpload() {
if (fileUpload == null) {
fileUpload = new FileUpload();
fileUpload.setName("upload");
}
return fileUpload;
}
private Button getAddButton() {
if (addButton == null) {
addButton = new Button("ADD");
addButton.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
formPanel.submit();
}
});
}
return addButton;
}
On server side
public class CmisFileUpload extends HttpServlet implements Servlet{
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
byte[] buffer = new byte[115200];//
String fileName = null;
String mimetype = null;
String majorVersion = null;
InputStream stream = null;
System.out.println("ServletWorking Fine");
}
Now when i Choose a file and click on ADD button i cant see the output on server side for this code System.out.println("ServletWorking Fine");
The outPut of System.out.println(GWT.getHostPageBaseURL() +"UploadFileServlet"); on client side is
http://127.0.0.1:8888/UploadFileServlet
and when i use this url directly on browser i get server side output for System.out.println("ServletWorking Fine");**
Edited
I created one more web application for file upload
public class Uploadfile implements EntryPoint {
FormPanel uploadForm = new FormPanel();
public void onModuleLoad() {
HorizontalPanel horizontalPanel = new HorizontalPanel();
uploadForm.setAction(GWT.getHostPageBaseURL() +"UploadFileServlet");
uploadForm.setEncoding(FormPanel.ENCODING_MULTIPART);
uploadForm.setMethod(FormPanel.METHOD_POST);
horizontalPanel.add(uploadForm);
// Create a panel to hold all of the form widgets.
VerticalPanel panel = new VerticalPanel();
uploadForm.setWidget(panel);
FlexTable flexTable = new FlexTable();
panel.add(flexTable);
// Create a FileUpload widget.
FileUpload upload = new FileUpload();
upload.setName("uploadFormElement");
flexTable.setWidget(2, 3, upload);
// panel.add(upload);
// Add a 'submit' button.
Button uploadSubmitButton = new Button("Submit");
panel.add(uploadSubmitButton);
uploadSubmitButton.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
// TODO Auto-generated method stub
uploadForm.submit();
}
});
uploadForm.addFormHandler(new FormHandler() {
public void onSubmit(FormSubmitEvent event) {
}
public void onSubmitComplete(FormSubmitCompleteEvent event) {
Window.alert(event.getResults());
}
});
RootPanel.get().add(horizontalPanel);
}
}
Server
protected void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
protected void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
System.out.println("working fine" );
}
This code is working fine
According to me there is no difference between the codes.
Plz tell me why the formpanel.submit is not working properly.
Plz help.

Answer 1

Is hide() method is closing the window??? If Yes then
remove move code hide(); after formPanel.submit();
for hide() use FormHandler. for eg
uploadForm.addFormHandler(new FormHandler() {
public void onSubmitComplete(FormSubmitCompleteEvent event) {
hide();
}
public void onSubmit(FormSubmitEvent event) {
}
});
reason: The FormPanel must not be detached (i.e. removed from its parent until the submission is complete. Otherwise, notification of submission will fail.

Answer 2

Why you have mapped for GET method for file upload. The GET request method is serving for the url entered in browser. Remove the GET Request Map, it will work.
For the POST request map, you can use MultipartFile for RequestParam as below
protected void uploadFileAndReconcilePayout1(#RequestParam("documentUpload") MultipartFile file, HttpServletRequest request, HttpServletResponse response) throws IOException {
//code for file working
}