Part 1:
RootPanel rootPanel = RootPanel.get();
this.html_panel_id = HTMLPanel.createUniqueId();
html_panel = new HTMLPanel("<div id=\"" + this.html_panel_id + "\"></
div>");
rootPanel.add(html_panel);
Part 2:
public native void recaptcha_show() /*-{
var recaptcha_container_id =
th...@com.example.www.index.client.Index::html_panel_id;
$wnd.Recaptcha.create("YOUR_RECAPTCHA_PUBLIC_KEY",
recaptcha_container_id, {theme: "clean", callback:
$wnd.Recaptcha.focus_response_field});
}-*/;
Part 3:
public native String recaptcha_get_challenge() /*-{
return $wnd.Recaptcha.get_challenge();
}-*/;
public native String recaptcha_get_response() /*-{
return $wnd.Recaptcha.get_response();
}-*/;
Part 4, 5, etc.:
Left as exercise for the reader
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