MultiBinder - injecting Collection<Provider<T>

[Suma Shivaprasad]

Trying to inject a collection of providers which implement an interface but consistently getting issues with injection as below

No implementation for java.util.Collection<com.google.inject.Provider<TypesChangeListener>> was bound.

[ERROR] at com.google.inject.internal.Errors.throwCreationExceptionIfErrorsExist(Errors.java:435)
[ERROR] at com.google.inject.internal.InternalInjectorCreator.initializeStatically(InternalInjectorCreator.java:154)
[ERROR] at com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:106)

Module

========

 Multibinder<TypesChangeListener> typesChangeListenerBinder = Multibinder.newSetBinder(binder(), TypesChangeListener.class);
        typesChangeListenerBinder.addBinding().to(GraphBackedSearchIndexer.class);

 // bind the MetadataService interface to an implementation
 bind(MetadataService.class).to(DefaultMetadataService.class).asEagerSingleton();

Injected class

==============

@Inject
DefaultMetadataService(final B b, final C c, final Collection<Provider<TypesChangeListener>> typeChangeListeners)

GraphBackedSearchIndexer implements TypesChangeListener

I see that Multibinder<TypesChangeListener> typesChangeListenerBinder = Multibinder.newSetBinder(binder(), TypesChangeListener.class);

is actually resulting in Set<TypesChangeListener> rather than Set<Provider<TypesChangeListener>> which is what I need? 

The javadoc for MultiBinder - http://google.github.io/guice/api-docs/latest/javadoc/index.html?com/google/inject/multibindings/Multibinder.html says "Collection<Provider<T>> could also be injected" but does not provide any examples.

Please let me know how this can be achieved.

Thanks

Suma

[Stephan Classen]

I think you need to inject

Provider<Set<TypesChangeListener>> typeChangeListeners

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[Thomas Broyer]

Which version are you using? This will only work starting with 4.0-beta5: https://github.com/google/guice/commit/4faa20e3081448792933834aedfe972add806292

[Suma Shivaprasad]

Am using guice 3.0 . Is there any other way of injecting a set of interface implementations as provider apart from upgrading since the one having it is still in beta ?

[Stephan Classen]

4.0 has been released about a month ago

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[Suma Shivaprasad]

Thanks :). Works with upgrade to 4.0 !

On Thursday, June 11, 2015 at 5:40:56 PM UTC+5:30, Suma Shivaprasad wrote: