Change By: Gunnar Morling (23/Jan/13 4:11 AM)
Description: As per the API documentation an {{IllegalArgumentException}} is to be thrown in case {{null}} is passed to {{ExecutableValidator#validateParameters()}} for the _parameterValues_ parameter, but the RI accepts that and returns an empty set of violations.

Also an {{IllegalArgumentException}} (instead of a {{NullPointerException}} as of today) needs to be thrown when passing {{null}} as single validation group ({{(Class<?>)null}}).
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