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See IoC Cookbook - Overriding IoC Services

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Introduction

Tapestry goes to great lengths so that you can use the Inject annotation on a field and provide no additional data, yet end up with the correct object or service.

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You can then contribute into the Infrastructure service's configuration:

  public static void contributeAlias(@InjectService("MyService") MyService myService,
        Configuration<AliasContribution> configuration)
  {
     configuration.add(AliasContribution.create(MyService.class, myService));
  }
}

The above example follows a typical pattern; the service to be vended is injected into the contributor method, using the explicit InjectService annotation. A contribution is made providing the service type.

Notice that the contribution doesn't have to be a service; you can just instantiate an object inside the contribution method and contribute that. That's what we're doing in the example, though we're using a create() static method rather than *new* (just to smooth out some Java Generics ugliness).

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