Your server sends an array with a single item being an element with a
"Hello" property, so your client code should use an
AsyncCallback<JsArray<X>> where X is some JavaScriptObject subclass with a
JSNI method getting the "Hello" property
class X extends JavaScriptObject {
protected X() { /* required by JSO */ }
public final native String getHello() /*-{ return this.Hello; }-*/;
}
...
jsonprb.requestObject(url, new AsyncCallback<JsArray<X>>() {
@Override
public void onSuccess(JsArray<X> result) {
X firstX = result.get(0);
Window.alert("Hello " + firstX.getHello());
}
...
}
On Monday, March 26, 2012 4:05:42 AM UTC+2, Blake wrote:
>
> Greetings,
>
> I have a GWT app talking to a Java servlet just fine except I can't seem
> to pass data. I've already spent a day on it. Any help would be greatly
> appreciated.
>
> I am using JsonpRequestBuilder and attempting to get around SOP. Here is
> my server code:
>
> public class GWTServlet extends HttpServlet {
> protected void processRequest(HttpServletRequest request,
> HttpServletResponse response)
> throws ServletException, IOException {
> String callback = request.getParameter("callback");
> PrintWriter out = response.getWriter();
> try {
> out.print(callback + "([{\"Hello\": \"world\"}]);");
> } finally {
> out.close();
> }
> }....
>
> Here is my GWT code:
>
> public void onClick(ClickEvent event) {
>
> JsonpRequestBuilder jsonprb= new JsonpRequestBuilder();
>
>
> jsonprb.requestObject("http://localhost:8084/XXX/GWTServlet<http://localhost:8084/XXX/GWTServlet>
> ",
>
> new AsyncCallback() {
>
> @Override
>
> public void onFailure(Throwable caught) {
>
> Window.alert("Failure getting JSONP directly from remote
> server");
>
> }
>
>
> @Override
>
> public void onSuccess(Object result) {
>
> Window.alert("Got response");
>
> JavaScriptObject res = (JavaScriptObject) result;
>
> Window.alert(res.toSource());
>
> }
>
> });
>
>
> I get the "Got response" message. I am also able to put break points on
> the frontend or backend and it gets to where I expect. The problem is that
> I can't seem to get at the data send from the server. I don't know what to
> do in onSuccess().
>
> Of course, once I get this working I will have the same challenge going
> the other way. Help is greatly appreciated.
>
> Blake McBride
>
>
>
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