Question

我正在使用DI在Play 2.5中访问我的应用程序：

import com.google.inject.{Inject, Provider}
import play.api.mvc._
import play.api.Application

class ApplicationController @Inject()(p: Provider[Application]) extends Controller {
  implicit lazy val app = p.get()
  println(app.hashCode()+"") // Random line to use the injected app
}

我收到以下错误：

ProvisionException: Unable to provision, see the following errors:

1) Tried proxying play.api.Application to support a circular dependency, but circular proxies are disabled. ...

我继续了Play迁移指南：https://www.playframework.com/documentation/2.5.x/Migration25#Handling-legacy-components

并按照他们的说法做了以避免循环依赖，但我仍然有这个错误。

我还发现了一个名为disableCircularProxies的变量，我目前没有使用它（http://google.github.io/guice/api-docs/latest/api-diffs/changes/docdiffs_com.google.inject.html），因为我不知道该怎么做，并且发现它的信息很少。

知道如何解决这个循环依赖错误吗？

这是完整的堆栈跟踪：

   Tried proxying play.api.Application to support a circular dependency, but circular proxies are disabled.
  at play.api.DefaultApplication.class(Application.scala:221)
  while locating play.api.DefaultApplication
  while locating play.api.Application
  at myCustomProject.controllers.ApplicationController.<init>(ApplicationController.scala:9)
  while locating myCustomProject.controllers.ApplicationController
    for parameter 1 at router.Routes.<init>(Routes.scala:31)
  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

最终，我不应该使用此Provider [Application]，而应该使用App中的配置，环境.... 根据文档，我应该能够做到这一点。

Answer 1

Java版本：

@Inject
private Provider<Application> application;

private void someMethod {
   ...
   application.get();
}

在Play 2.5.2中注入当前的App

1 个答案: