ClassCastException from Map update in iOS6

Hello, 

So, as many people have experienced, some of our apps stop working on iOS6.  We are seeing ClassCastException from Cookie.isCookieEnabled(). After some debugging,  I found the exception is actually thrown by the line of code:

          m.@java.util.Map::put(Ljava/lang/Object;Ljava/lang/Object;)(name,value);

in Cookie.loadCookies method.  I can consistently reproduce the issue in UIWebView (iPad), but intermittently in Safari.  Here is the best part: the issue does not occur when I connect to it with Safari's remote debugging.  So I had to isolate the root cause with fair amount of window.alert.

We are using GWT 2.4.0.

Has anyone seen this issue?

Thanks

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