Inheritance annotation and RequestMapping problems

[basilfx]

I'm having a problem and I cannot find a solution for it. This problem is making me sick for the past few days. This is the model I use:

@Entity
@RooEntity
@RooJavaBean
@Inheritance(strategy = InheritanceType.JOINED)
public abstract class UitlegOnderdeel {

	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	@Column(name = "id")
	protected Long id;	
	
	/**
	 * Titel van het onderdeel
	 */
	@NotNull
	protected String naam;
}

@Entity
@RooEntity
@RooJavaBean
public class UitlegOnderdeelHTML extends UitlegOnderdeel {

	@Lob
	String content;

	@Override
	public UitlegType getType() {
		return UitlegType.HTML;
	}
	
}

When I call the next function from the browser, it prints null. The reason why is that Spring does not understand that a UitlegOnderdeelHTML is also a UitlegOnderdeel (which is abstract).

@Transactional
@RequestMapping(value = "/admin/uitlegonderdeel/{onderwerpid}/form", method = RequestMethod.POST)
public String create(@PathVariable("onderwerpid") Long onderwerpId, UitlegOnderdeel formObject, BindingResult result, ModelMap modelMap) {
	System.out.println(formObject);
	...
}

I have tried several things, like custom validation, type casting, but they all do not work since Spring does not bind the form to the formObject parameter.

I am looking for a generic solution where I can use the method above (in some way) to bind several subclasses of UitlegOnderdeel. SpringMVC3 is used.

-BasilFX

[Marten Deinum]

And how should it know? You pass in an id (onderwerpid) and then you expect spring to automagically detect that that maps to a UitlegOnderdeelHTML? Next to that you are missing the @ModelAttribute if the object is your formObject without it is never going to do binding. However your method seems to be somewhat contra-dictionary.