CODEWITHSUNDEEP
scalaplayframeworkdependency-injectionguice
Abhijit Sarkar
Abhijit Sarkar

Reputation: 24518

Guice Multibinder Doesn't Work with Play Framework

Using Play 2.5.8 with Scala 2.11.8.

I've a trait RequestMatcher and multiple implementations of it. I'd like to have a Seq[RequestMatcher] injected in my service. My module looks like the following:

class FeignModule(environment: Environment, configuration: Configuration) extends AbstractModule with AkkaGuiceSupport {
  def configure() = {
    val requestMatcherBinder = Multibinder.newSetBinder(binder(), classOf[RequestMatcher])
    // TODO: Allow for user specified matchers
    requestMatcherBinder.addBinding().to(classOf[DefaultPathMatcher])
    requestMatcherBinder.addBinding().to(classOf[DefaultMethodMatcher])
    requestMatcherBinder.addBinding().to(classOf[DefaultQueriesMatcher])
    requestMatcherBinder.addBinding().to(classOf[DefaultHeadersMatcher])
    requestMatcherBinder.addBinding().to(classOf[DefaultBodyMatcher])

    // TODO: Allow for user specified actors
    bindActor[DefaultRecordingService]("recordingService")
  }
}

The injection target is as follows:

@javax.inject.Singleton
class FeignService @Inject()(@Named("recordingService") val recordingService: ActorRef,
                             val feignProperties: FeignProperties,
                             val matchers: Seq[RequestMatcher])
                            (implicit val ec: ExecutionContext) {
}

But

play.api.UnexpectedException: Unexpected exception[ProvisionException: Unable to provision, see the following errors:

1) No implementation for scala.collection.Seq was bound. while locating scala.collection.Seq for the 3rd parameter of service.FeignService.(FeignService.scala:19)

I know the module is read by Play because the Actor (1st parameter to FeignService) is injected just fine. I have the guice-multibindings jar on classpath too.

What's wrong?

Upvotes: 2

Views: 753

Answers (1)

user12450702
user12450702

Reputation: 21

Thread is a little old but if anybody (like me) has the same problem: The correct answer is in comments to this question but was probably overlooked: guice Multibinder injects Java collections, not scala collections

Upvotes: 2

Related Questions