GMail authentication with GWT + GAE - works in development but fails in production

Hi All,

I am authenticating my users through GMail login in GWt + GAE environment. Code is as follows:

GWT code:

final Frame frameForGmail = new Frame();

final Image gmailIcon = Image.wrap(Document.get().getElementById("gmailIcon"));

final DialogBox loginPopUp = new DialogBox(true, false);

gmailIcon.addClickHandler(new ClickHandler() {

@Override

public void onClick(ClickEvent event) {

commonRpcService.gmailLogin(new AsyncCallback<String>() {

@Override

public void onFailure(Throwable caught) {

Window.alert("RPC Failed");

}

@Override

public void onSuccess(String result) {

if(emailValidation(result)) {

Document.get().getElementById("loginMsg").appendChild(new Label("Welcome "+result).getElement());

}else {

frameForGmail.setUrl(result);

loginPopUp.show();

}

}

});

}

});

Server side:

@Override

public String gmailLogin() {

UserService userService = UserServiceFactory.getUserService();

User user = userService.getCurrentUser();

if(user != null) {

HttpSession session = getThreadLocalRequest().getSession(true);

session.setAttribute("LOGGED_IN_USER_EMAIL_ID", user.getEmail());

return user.getEmail();

}else {

try {

                  // getThreadLocalResponse().sendRedirect(userService.createLoginURL(getThreadLocalRequest().getRequestURI()));

return userService.createLoginURL("www.yatrafinder.com");

} catch (Exception e) {

System.out.println("CommonRpcServiceImpl.gmailLogin() "+e.getMessage());

}

}

return "Login not validated";

}

The above code works fine in development mode. It loads Frame with default login screen for development and works fine everything.

But when i deploy this app to GAE 1.6.1, it fails to load the frame with gmail login screen. The DialogBox opens but with blank screen.

I could not find out why it is happening. Kindly help.

App engine settings is done properly with default authentication as google account.

Thanks in advance 
Deepak Singh

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