InConstraintCompositionTest, tests #testMixedConstraintTargetsInComposedAndComposingConstraintsCauseException() and #testMixedConstraintTargetsInComposingConstraintsCauseException() expect a ConstraintDefinitionException, but both attempt to validate an empty Object array for a method whose signature is (int). However, the methods of ExecutableValidator all declare that an IllegalArgumentException will be thrown if any parameters to *those* methods do not match. I take this to mean that a parameter array should be of the same length and respectively assignable types to the parameter types supported by a method or constructor, and similarly that a validated return value should actually be a value that could have been returned by a given method or constructor. I don't see that there is any specification as to when these IllegalArgumentExceptions should be thrown, but it seems to me that you would typically validate the objects you have locally before going off to look up and validate the metadata for the appropriate bean type. I would request that the parameter arrays used in these tests be updated to something actually compatible with the methods in question, which could only serve to further the emphasis on the actual spec item being verified by the test method in question. Thanks, Matt