GWT often (if not always) transforms methods that are not overridden into
static methods. Such static methods begin with a $ sign.
In your stack trace you can see Unknown.$getView is causing the exception
with message "Can not read property 'view' of undefined". That basically
means in your Java code you have called null.getView() because GWT
transforms this into something like $getView(instance) { return
instance.view; } with instance being "undefined" (= null).
So it is either a bug in your app which can cause NullPointer exceptions or
you have found a very rare case which causes the GWT compiler to produce
wrong JS.
-- J.
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