Re: redundant remove call with HandlerManager

An AssertionError is a Throwable but not an Exception: http://download.oracle.com/javase/6/docs/api/java/lang/AssertionError.html

Anyway, you shouldn't catch the exception, you should rather make sure it doesn't happen. For instance, whenever you removeHandler(), you could null the variable, so the next time you won't try to call removeHandler() a second time on the same HandlerRegistration.

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