GWT subir un archivo al servidor

[jorgebil]

Hola a todos!

soy nuevo programando en GWT y me han mandado hacer un proyectillo que suba un archivo al servidor TOMCAT. Ando venga a mirar ejemplos y todos me dan error. MI código es el siguiente.

public class FormPanelExample implements EntryPoint {

public void onModuleLoad() {
// Create a FormPanel and point it at a service.
final FormPanel form = new FormPanel();
form.setAction("/myFormHandler");

// Because we're going to add a FileUpload widget, we'll need to set the
// form to use the POST method, and multipart MIME encoding.
form.setEncoding(FormPanel.ENCODING_MULTIPART);
form.setMethod(FormPanel.METHOD_POST);

// Create a panel to hold all of the form widgets.
VerticalPanel panel = new VerticalPanel();
form.setWidget(panel);

// Create a TextBox, giving it a name so that it will be submitted.
final TextBox tb = new TextBox();
tb.setName("textBoxFormElement");
panel.add(tb);



// Create a FileUpload widget.
FileUpload upload = new FileUpload();
upload.setName("uploadFormElement");
panel.add(upload);

// Add a 'submit' button.
panel.add(new Button("Submit", new ClickListener() {
public void onClick(Widget sender) {
form.submit();
}
}));


FormHandler FH= new FormHandler(){
public void onSubmit(FormSubmitEvent event) {
// This event is fired just before the form is submitted. We can take
// this opportunity to perform validation.
if (tb.getText().length() == 0) {
Window.alert("The text box must not be empty");
event.setCancelled(true);
}
}

public void onSubmitComplete(FormSubmitCompleteEvent event) {
// When the form submission is successfully completed, this event is
// fired. Assuming the service returned a response of type text/html,
// we can get the result text here (see the FormPanel documentation for
// further explanation).
Window.alert(event.getResults());
}
};




form.addFormHandler(FH);




// Add an event handler to the form.
/* form.addFormHandler(new FormHandler() {
public void onSubmit(FormSubmitEvent event) {
// This event is fired just before the form is submitted. We can take
// this opportunity to perform validation.
if (tb.getText().length() == 0) {
Window.alert("The text box must not be empty");
event.setCancelled(true);
}
}

public void onSubmitComplete(FormSubmitCompleteEvent event) {
// When the form submission is successfully completed, this event is
// fired. Assuming the service returned a response of type text/html,
// we can get the result text here (see the FormPanel documentation for
// further explanation).
Window.alert(event.getResults());
}
});*/

RootPanel.get().add(form);
}
}


lo que el falta? alguna idea o tutorial para conseguir este objetivo???

Gracias y saludos a todos