 it is
     a bean constraint
     the bean instance hosting the property the constraint
     is applied on if it is a property constraint or a container element constraint
     hosted on a property
     <code>null</code> when the <code>ConstraintViolation</code> is returned
     after calling <a href="Validator.html#validateValue(java.lang.Class,java.lang.String,java.lang.Object,java.lang.Class...)"><code>Validator.validateValue(Class, String, Object, Class[])</code></a>
     
     the object the method is