around this issue What's happening here is that the constructor StackException is just passing the message and cause to its super class. And so, the regarding super class constructor is invoked. Don't be confused by Exceptions, it is just like any other Java inheritance.
Does that help In case anyone else comes across similar problems, they have something to do with the code running under sandbox security restrictions when on the appengine servers, but without such restrictions when running on a local development server. The sandbox restrictions don't allow reflection on private variables.
Proguard: can't find referenced method 'void addSuppressed(java.lang.Throwable)' in library class java.lang.Throwable