An app that works with GWT 2.4 stops working with GWT 2.5 on iOS 6 but both versions work with iOS 5. To investigate we connected to iOS 6 using Safari's remote debugging tools and suddenly the app works again with GWT 2.5 and no further modifications. Disconnect from remote debugging lets the app break again. Also it does not always break at the same app state. Sometimes it simply fails to load and sometimes it loads but fails during a place change.
Normally we send unexpected JS exceptions to a server so we can deobfuscate its stack trace and fix it. In this case nothing gets send to the server so we had to add some logging code as we cant remote debug. So we added a while loop which prints the exception stack trace (its a while loop because of possible GWT UmbrellaExceptions), compiled the app and suddenly it works again. Then removed the code again, recompiled and its broken again.
We have taken both compilations (with and without this logging while loop), corrected the GWT generated MD5 file names and then run a diff on everything. The only difference was the while loop code, that really was very very simple. So about 10 lines of code are different.
So we keep the loop in, it really does nothing, but the app "somehow works" on iOS 6 with GWT 2.5 but maybe it still breaks in certain circumstances.
No idea whats going on here but I hope that Apple will know whats going on and will fix its JS engine in iOS 6.1. Not sure what they have done but they clearly have done something wrong.
So be prepared that you simply can't solve your issue.
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