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https://issues.apache.org/jira/browse/WICKET-2781?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Igor Vaynberg resolved WICKET-2781.
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Resolution: Won't Fix
Assignee: Igor Vaynberg
> Support @SpringBean injection into generic superclass
> -----------------------------------------------------
>
> Key: WICKET-2781
> URL: https://issues.apache.org/jira/browse/WICKET-2781
> Project: Wicket
> Issue Type: Improvement
> Components: wicket-spring
> Affects Versions: 1.4.7
> Reporter: Erkki Lindpere
> Assignee: Igor Vaynberg
> Priority: Minor
> Attachments: wicket-spring-inject-patch.txt
>
>
> It's possible to inject Spring Beans into a generic superclass, if the field
> type to be injected is a type variable. I will attach a patch that does this
> (I don't know if it's the best or most general implementation, but it works
> in my case). This allows us to reduce code in a wicket-spring project and it
> would be great if you could integrate this change into wicket-spring.
> This also allows better integration with Scala because it seems Scala
> initialization order is different enough from Java that it seems impossible
> to make a variable injected into a subclass of a generic superclass available
> to the generic superclass's constructor.
> Simplified example for the motivation:
> public abstract class EditPage<EntityType, RepoType extends
> IRepository<EntityType>> {
> @SpringBean
> RepoType repository;
> ...
> }
> Concrete "edit pages" extend this and define EntityType and RepoType.
> Injecting in the superclass allows the subclasses to be very thin, which is
> great. I was not able to implement this in Scala (maybe there's some trick
> but I don't know), even if I replace the repostiory with: protected abstract
> RepoType getRepository() and implement this in a Scala subclass:
> class UserEditPage extends EditPage<User, UserRepo> {
> @SpringBean
> var repo: UserRepo = _
> def getRepository = repo
> }
> when the superclass' constructor calls getRepository, it will get null (and
> sometimes method not found getRepository: IRepository, but that might be due
> to JRebel)
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