CODEWITHSUNDEEP
scalaplayframework
SkyWalker
SkyWalker

Reputation: 14307

Play 2.7.x: ProvisionException: Unable to provision play.api.Application with circular dependencies

From Play 2.7.x I'm unable to get hold of the play.api.Application, I have tried multiple ways e.g. from a custom module (plugin) or even from my ApplicationController. I always get the following circular dependencies error:

ProvisionException: Unable to provision, see the following errors:

1) Found a circular dependency involving play.api.Application, and circular dependencies are disabled.
  at play.api.DefaultApplication.class(Application.scala:252)
  while locating play.api.DefaultApplication
  while locating play.api.Application
    for the 10th parameter of controllers.ApplicationController.<init>(ApplicationController.scala:30)
  while locating controllers.ApplicationController
    for the 2nd parameter of router.Routes.<init>(Routes.scala:111)
  while locating router.Routes
  while locating play.api.inject.RoutesProvider
  while locating play.api.routing.Router
    for the 3rd parameter of play.api.http.DefaultHttpRequestHandler.<init>(HttpRequestHandler.scala:120)
  while locating play.api.http.DefaultHttpRequestHandler
  while locating play.api.http.HttpRequestHandler
    for the 6th parameter of play.api.DefaultApplication.<init>(Application.scala:253)
  at play.api.DefaultApplication.class(Application.scala:252)
  while locating play.api.DefaultApplication
  while locating play.api.Application

1 error

For example, from my custom module DynamicTemplateLoader:

@Singleton
class DynamicTemplateLoader @Inject(app: play.api.Application) {
   ...
}

or from my ApplicationController:

class ApplicationController @Inject() (
  components: ControllerComponents
)(
  implicit app: play.api.Application
) extends AbstractController(components) with I18nSupport {
   ...
}

Why do I need the play.api.Application? I need to get hold of the app.classloader to use reflection from my plugin.

Upvotes: 0

Views: 437

Answers (1)

SkyWalker
SkyWalker

Reputation: 14307

Resolved the issue by switching from injecting an instance of play.api.Application to instead injecting an instance of javax.inject.Provider[play.api.Application].

Upvotes: 1

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