I'm using Hibernat-Validator 4.2.0 Final in an Android project and it fails with the following:
This happens because java.beans.Introspector is not part of Dalvik. Looking at the code it seems only the Introspector is used only in the following line:
which is a very simple String manipulation method.
Included a decapitalize method in the ReflectionHelper removing the dependency toward the Introspector.
I tested this solution with some simple valdation constraint and everything worked fine.
Android 2.x, 4.x