@Inject the implementation, not the interface. @Inject'd implementations
have some code smell, but no more than downcasting.
On Tue, Jul 23, 2013 at 8:40 AM, Daniel Watrous <dwmaill...@gmail.com>wrote:
> That being the case, is there any way to get an instance that I can cast to
> a concrete type?
>
>
> On Tue, Jul 23, 2013 at 9:27 AM, Martin Grigorov <mgrigo...@apache.org
> >wrote:
>
> > Hi,
> >
> >
> > On Tue, Jul 23, 2013 at 6:20 PM, Daniel Watrous <dwmaill...@gmail.com
> > >wrote:
> >
> > > Hi,
> > >
> > > I'm having an issue that I suspect is related to the wicket integration
> > > with Guice. Any help is appreciated.
> > >
> > > I have a Page class that uses field injection to inject a DAO. I then
> > want
> > > to cast my DAO to a more specific type (what I inject is the
> interface).
> > > Here's what that looks like
> > >
> > > public class CnavModify extends ConsoleBasePage {
> > >
> > > @Inject private CnavUrlDAO cnavUrlDAO;
> > > public CnavModify(PageParameters parameters) {
> > > super(parameters);
> > > if (parameters.get("cnavid").toString() != null) {
> > > cnavid = new ObjectId(parameters.get("cnavid").toString());
> > > }
> > > if (cnavid != null) {
> > > cnavUrlModel = new
> > >
> > >
> >
> DetachableCnavUrlModel(((MorphiaCnavUrlDAO)cnavUrlDAO).getCnavById(cnavid));
> > > }
> > > }
> > > }
> > >
> > > When I try to cast it I get the following error:
> > >
> > > Last cause: $Proxy23 cannot be cast to
> > > com.hp.honeybadger.persistence.dao.morphia.MorphiaCnavUrlDAO
> > >
> > > I am able to use the CnavUrlDAO as a CnavUrlDAO, but its type is
> $Proxy23
> > > and I am unable to cast it to a concrete type.
> > >
> > > Is this Guice or Wicket related? Any idea how to get around this?
> > >
> >
> > It is an error in your assumption.
> >
> > Wicket injects a proxy that implements CnavUrlDAO but knows nothing about
> > the specific implementation about this interface.
> > Whenever the proxy is used it delegates the call to the bean/service
> > returned by Guice's injector (something like:
> > Injector.getBinding(CnavUrlDAO.class).doSomething()).
> >
> >
> > >
> > > Thanks,
> > > Daniel
> > >
> >
>
