已配置到play.api.db.DBApi的绑定，play-slick的演变和注入器错误

Question

我想将slick引入到我的play项目中，因此我向build.sbt添加了以下依赖项：

"com.typesafe.play"          %% "play-slick"               % "1.0.1"     withSources(),
  "com.typesafe.play"          %% "play-slick-evolutions"    % "1.0.1"     withSources(),

然后，当我为控制器运行集成规范时，我在Intellij IDE和命令行激活器测试中都得到了以下异常。在谷歌之后，我找到了解决方案：https://www.playframework.com/documentation/2.4.x/PlaySlickFAQ#A-binding-to-play.api.db.DBApi-was-already-configured

删除jdbc依赖后，使用命令行通过了集成规范，但是在Intellij IDE上运行测试时仍然得到相同的错误，如下所示:在嵌套套件上调用run时遇到异常-无法创建注入器，请参见以下错误：

1) A binding to play.api.db.DBApi was already configured at play.api.db.DBModule.bindings(DBModule.scala:25):
Binding(interface play.api.db.DBApi to ProviderConstructionTarget(class play.api.db.DBApiProvider)) (via modules: com.google.inject.util.Modules$OverrideModule -> play.api.inject.guice.GuiceableModuleConversions$$anon$1).
  at play.api.db.slick.evolutions.EvolutionsModule.bindings(EvolutionsModule.scala:15):
Binding(interface play.api.db.DBApi to ConstructionTarget(class play.api.db.slick.evolutions.internal.DBApiAdapter) in interface javax.inject.Singleton) (via modules: com.google.inject.util.Modules$OverrideModule -> play.api.inject.guice.GuiceableModuleConversions$$anon$1)

1 error
com.google.inject.CreationException: Unable to create injector, see the following errors:

1) A binding to play.api.db.DBApi was already configured at play.api.db.DBModule.bindings(DBModule.scala:25):
Binding(interface play.api.db.DBApi to ProviderConstructionTarget(class play.api.db.DBApiProvider)) (via modules: com.google.inject.util.Modules$OverrideModule -> play.api.inject.guice.GuiceableModuleConversions$$anon$1).
  at play.api.db.slick.evolutions.EvolutionsModule.bindings(EvolutionsModule.scala:15):
Binding(interface play.api.db.DBApi to ConstructionTarget(class play.api.db.slick.evolutions.internal.DBApiAdapter) in interface javax.inject.Singleton) (via modules: com.google.inject.util.Modules$OverrideModule -> play.api.inject.guice.GuiceableModuleConversions$$anon$1)

1 error
    at com.google.inject.internal.Errors.throwCreationExceptionIfErrorsExist(Errors.java:466)
    at com.google.inject.internal.InternalInjectorCreator.initializeStatically(InternalInjectorCreator.java:155)
    at com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:107)
    at com.google.inject.Guice.createInjector(Guice.java:96)
    at com.google.inject.Guice.createInjector(Guice.java:73)
    at com.google.inject.Guice.createInjector(Guice.java:62)
    at play.api.inject.guice.GuiceBuilder.injector(GuiceInjectorBuilder.scala:126)
    at play.api.inject.guice.GuiceApplicationBuilder.build(GuiceApplicationBuilder.scala:93)
    at play.api.test.FakeApplication.<init>(Fakes.scala:216)
    at org.scalatestplus.play.OneServerPerSuite$class.app(OneServerPerSuite.scala:152)

Answer 1

如果你和我一样，你的build.sbt里有类似这样的东西

libraryDependencies ++= Seq(
  jdbc,
  cache,
  ws,
  specs2 % Test,
  "mysql" % "mysql-connector-java" % "5.1.37",
  "com.typesafe.play" %% "play-slick" % "1.1.1",
  "com.typesafe.play" %% "play-slick-evolutions" % "1.1.1"
)

删除jdbc

libraryDependencies ++= Seq(
  //jdbc, //<<---- this one here
  cache,

Answer 2

您可能已经向jdbc添加了依赖项，如果您使用slick来处理它，这是没有意义的。移除它，它就会正常工作。