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2012-09-02T15:26:27.340
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I can't see any simple and elegant solution. Maybe because the problem is not how to data bind abstract classes in Spring MVC, but rather : why having abstract classes in form objects in the first place ? I think you shouldn't. An object sent from the form to the controller is called a "form (backing) object" for a reason : the object attributes should reflect the form fields. If your form has username and password fields, then you should have username and password attributes in your class. So <code>credentials</code> should have a <code>UserPasswordCredentials</code> type. This would skip your "abstract instantiation attempt" error. Two solutions for this : <ul> <li>Recommended : you change the type of UserAccount.credentials from Credentials to UserPasswordCredentials. I mean, what Credentials could a UserAccount possibly have, except a UserPasswordCredentials ? What's more, I bet your database userAccounts have a username and password stored as credentials, so you could as well have a UserPasswordCredentials type directly in UserAccount. Finally, Spring recommends using "existing business objects as command or form objects" (<a href="http://static.springsource.org/spring/docs/3.0.x/spring-framework-reference/html/mvc.html" rel="nofollow">see doc</a>), so modifying UserAccount would be the way to go.</li> <li>Not recommended : you keep UserAccount as is, and you create a UserAccountForm class. This class would have the same attributes as UserAccount, except that UserAccountForm.credentials has a UserPasswordCredentials type. Then when listing/saving, a class (UserAccountService for example) does the conversion. This solution involves some code duplication, so only use it if you have a good reason (legacy entities you cannot change, etc.).</li> </ul>
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1. POData binding of an abstract class in spring-mvc
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1. USJerome Dalbert
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