DefaultValidationParameterFactory call to NullValueAwareConcurrentHashMap is considered ambiguous by Eclipse JDT compiler

NVACHM provides (V) and (Class<V>) constructors. When type parameters of the constructed map are <Class, Class> and the constructor argument is a Class object the call is determined ambiguous as the argument is both a V and a Class<V>. The provided patch satisfies the Eclipse compiler and works for both trunk and the -20 branch (it is assumed that it will work in the -11 branch as well). Don't shut out an entire IDE.