Okay, I'll bite. What is "contravariance?" Mark
-----Original Message----- From: Dan Jacobs [mailto:[EMAIL PROTECTED]] Sent: Thursday, January 16, 2003 7:17 AM Based on the oft misunderstood property of contravariance, I *do* conclude that form-beans should not be subtyped from Java Beans, for the reason that subtypes are never supposed to have fewer behaviors than their supertypes. It's customary in good object-oriented design to use delegation rather than subclassing to use only a selected subset of behaviors from another kind of thing. If Struts is saying that a form-bean should never act like a bean in such-and-such manners, then it follows that form-beans should not be beans. This *is* an architecture issue. -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
