How can I get a Spring bean injected in my custom Wicket model class?

The wicket dependency-injection works with classes implementing IComponentInstantiationListener. These application-level listeners are called whenever a Component is instantiated. This is the hook used for dependency injection of components.

The model classes do not have such a mechanism in place. Any model can directly implement IModel so there is no abstract base class which can call the listeners, unlike Component.

I use the following base class for my injected models (Wicket 1.5):

public abstract class InjectedDetachableModel<T> extends LoadableDetachableModel<T> {    public InjectedDetachableModel() {        Injector.get().inject(this);    }    public InjectedDetachableModel(T a_entity) {        super(a_entity);        Injector.get().inject(this);    }}

Edit:Summary of relevant differences between 1.4 and 1.5, taken from Wicket 1.5 migration guide:

Wicket 1.4

@Overrideprotected void init(){    // initialize Spring    addComponentInstantiationListener(new SpringComponentInjector(this, applicationContext));}

and

InjectorHolder.getInjector().inject(Object object)

Wicket 1.5:

@Overrideprotected void init(){    // initialize Spring    getComponentInstantiationListeners().add(new SpringComponentInjector(this, applicationContext))}

and

Injector.get().inject(Object object)

Apparently Spring beans don't get automatically injected to other classes than Pages. I've run to this also with my custom WebRequestCycle class.

One easy solution is to trigger the injection manually using InjectorHolder.getInjector().inject(this).

So, writing the constructor like this makes the model work as intended:

ReportExportFileModel(ReportDto reportDto) {    this.reportDto = reportDto;    InjectorHolder.getInjector().inject(this);}

Edit: ah, right after posting this, I found another SO question with a more accurate explanation of what's going on:

@SpringBean works only in any subclass of Component.