如何在 Play 2.5 中激活循环依赖？

Question

这个问题源于question that I asked two days ago. I implemented my own error handler which extends DefaultHttpErrorHandler. DefaultHttpErrorHandler extends HttpErrorHandler which is also used as a parameter errorHandler: HttpErrorHandler in the WebJarAssets class. First I thought I had a flaw in my design, but James Ward评论说看来我做的事情是对的。

长话短说，我需要知道如何激活循环依赖。不幸的是，Play documentation 中没有列出示例代码，所以我不知道应该在哪里设置 disableCircularProxies(false)。

Answer 1

您需要自定义 GuiceApplicationLoader，例如：

import play.api.ApplicationLoader
import play.api.inject.guice.{GuiceApplicationLoader, GuiceApplicationBuilder}

class CustomApplicationLoader extends GuiceApplicationLoader {
  override protected def builder(context: ApplicationLoader.Context): GuiceApplicationBuilder = {
    super.builder(context).disableCircularProxies(false)
  }
}

并告诉 Play 在 application.conf:

中使用它

play.application.loader = "CustomApplicationLoader"

完整代码示例： https://github.com/webjars/webjars-play/tree/cicular-deps

如何在 Play 2.5 中激活循环依赖？

How to activate circular dependencies in Play 2.5?

scala

playframework

guice

webjars

playframework-2.5