Guice and Play2 Singleton from trait

Question

I am using Play with Scala and I am trying to create a singleton, and i want to inject it from its trait and not directly.

for example:

@ImplementedBy(classOf[S3RepositoryImpl])
trait S3Repository {
}
@Singleton
class S3RepositoryImpl extends S3Repository {
}

But this fails with error:

trait Singleton is abstract; cannot be instantiated

I have tried several combinations and they all produce the same.

I come from Spring background and its very natural there? am i missing something about how Guice handles this type of Injection?

Thanks.

Answer 1

Use below import, instead of import javax.inject.Singleton

import com.google.inject.{Inject, Singleton}

Answer 2

As pointed out by @Tavian-Barnes, the solution is to ensure you have the following import:

import javax.inject.Singleton

Answer 3

Import both Inject and Singleton.

import javax.inject.{Inject, Singleton}

Refrain from using:

import com.google.inject.{Inject, Singleton}

as play framework requires the javax import