When you write in Java "new Credentials()" it will be translated to 
JavaScript "new $wnd.Object". So JsInterop explicitly uses the top window 
referenced through GWT's special $wnd variable. If you now inject your 
HelloJS library into the GWT iframe using ScriptInjector then "new 
$wnd.Object instanceof Object" returns false as it checks the top window 
Object against the iframe Object.

So use ScriptInjector.fromString/Url().setWindow(ScriptInjector.TOP_WINDOW) 
for your Hello JS lib. Then it should work.

-- J.

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