After I implemented what has been suggested by an answer of my last question, I received the following error when accessing the application in the browser:
ProvisionException: Unable to provision, see the following errors:
1) Tried proxying play.api.http.HttpErrorHandler to support a circular dependency, but circular proxies are disabled.
while locating utils.ErrorHandler
while locating play.api.http.HttpErrorHandler
for parameter 0 at controllers.WebJarAssets.<init>(WebJarAssets.scala:19)
at controllers.WebJarAssets.class(WebJarAssets.scala:19)
while locating controllers.WebJarAssets
for parameter 5 at utils.ErrorHandler.<init>(ErrorHandler.scala:17)
while locating utils.ErrorHandler
while locating play.api.http.HttpErrorHandler
for parameter 0 at router.Routes.<init>(Routes.scala:39)
while locating router.Routes
while locating play.api.inject.RoutesProvider
while locating play.api.routing.Router
for parameter 0 at play.api.http.JavaCompatibleHttpRequestHandler.<init>(HttpRequestHandler.scala:200)
while locating play.api.http.JavaCompatibleHttpRequestHandler
while locating play.api.http.HttpRequestHandler
for parameter 4 at play.api.DefaultApplication.<init>(Application.scala:221)
at play.api.DefaultApplication.class(Application.scala:221)
while locating play.api.DefaultApplication
while locating play.api.Application
This error occurs because I have a class called ErrorHandler
(adapted from this tutorial):
package utils
import javax.inject.Inject
import com.mohiva.play.silhouette.api.SecuredErrorHandler
import play.api.http.DefaultHttpErrorHandler
import play.api.i18n.{I18nSupport,Messages,MessagesApi}
import play.api.mvc.Results._
import play.api.mvc.{Result,RequestHeader}
import play.api.routing.Router
import play.api.{OptionalSourceMapper,Configuration}
import scala.concurrent.Future
import controllers.routes
class ErrorHandler @Inject() (
val messagesApi: MessagesApi,
env: play.api.Environment,
config: Configuration,
sourceMapper: OptionalSourceMapper,
router: javax.inject.Provider[Router],
webJarAssets: WebJarAssets)
extends DefaultHttpErrorHandler(env, config, sourceMapper, router)
with SecuredErrorHandler with I18nSupport {
override def onNotAuthenticated(request: RequestHeader, messages: Messages): Option[Future[Result]] =
Some(Future.successful(Redirect(routes.Auth.signIn())))
override def onNotAuthorized(request: RequestHeader, messages: Messages): Option[Future[Result]] =
Some(Future.successful(Redirect(routes.Auth.signIn()).flashing("error" -> Messages("error.accessDenied")(messages))))
override def onNotFound(request: RequestHeader, message: String): Future[Result] =
Future.successful(Ok(views.html.errors.notFound(webJarAssets, request)))
override def onServerError(request:RequestHeader, exception:Throwable):Future[Result] =
Future.successful(Ok(views.html.errors.serverError(webJarAssets, request, exception)))
}
Now the problem is that the WebJarAssets
class has errorHandler: HttpErrorHandler
as a parameter and ErrorHandler
extends DefaultHttpErrorHandler
which subsequently extends HttpErrorHandler
. That's why there is a circular dependency. Any idea how I can fix that?
来源:https://stackoverflow.com/questions/37057137/how-to-prevent-circular-dependencies-when-using-webjarassets-play-2-5