scala - 编译 Play 应用程序时出现的问题

Question

我在编译 Play 框架应用程序时遇到了一些问题。有时应用程序运行良好，但大多数时候这些问题都是在 sbt 和 activator 工具中发生的。下面是使用 sbt 编译我的应用程序的示例:

[info] Compiling 15 Scala sources and 1 Java source to C:\Server\trunk\target\scala-2.11\classes...
[error] C:\Server\trunk\target\scala-2.11\src_managed\main\controllers\routes.java:8: error: cannot find symbol
[error] public static final controllers.ReverseAssets Assets = new controllers.ReverseAssets();
[error]                                ^
[error]   symbol:   class ReverseAssets
[error]   location: package controllers
[error] C:\Server\trunk\target\scala-2.11\src_managed\main\controllers\routes.java:9: error: cannot find symbol
[error] public static final controllers.ReverseApplication Application = new controllers.ReverseApplication();
[error]                                ^
[error]   symbol:   class ReverseApplication
[error]   location: package controllers
[error] C:\Server\trunk\target\scala-2.11\src_managed\main\controllers\routes.java:12: error: package controllers.javascript does not exist
[error] public static final controllers.javascript.ReverseAssets Assets = new controllers.javascript.ReverseAssets();
[error]                                           ^
[error] C:\Server\trunk\target\scala-2.11\src_managed\main\controllers\routes.java:13: error: package controllers.javascript does not exist
[error] public static final controllers.javascript.ReverseApplication Application = new controllers.javascript.ReverseApplication();
[error]                                           ^
[error] C:\Server\trunk\target\scala-2.11\src_managed\main\controllers\routes.java:18: error: package controllers.ref does not exist
[error] public static final controllers.ref.ReverseAssets Assets = new controllers.ref.ReverseAssets();
[error]                                    ^
[error] C:\Server\trunk\target\scala-2.11\src_managed\main\controllers\routes.java:19: error: package controllers.ref does not exist
[error] public static final controllers.ref.ReverseApplication Application = new controllers.ref.ReverseApplication();
[error]                                    ^
[error] C:\Server\trunk\target\scala-2.11\src_managed\main\controllers\routes.java:8: error: cannot find symbol
[error] public static final controllers.ReverseAssets Assets = new controllers.ReverseAssets();
[error]                                                                       ^
[error]   symbol:   class ReverseAssets
[error]   location: package controllers
[error] C:\Server\trunk\target\scala-2.11\src_managed\main\controllers\routes.java:9: error: cannot find symbol
[error] public static final controllers.ReverseApplication Application = new controllers.ReverseApplication();
[error]                                                                                 ^
[error]   symbol:   class ReverseApplication
[error]   location: package controllers
[error] C:\Server\trunk\target\scala-2.11\src_managed\main\controllers\routes.java:12: error: package controllers.javascript does not exist
[error] public static final controllers.javascript.ReverseAssets Assets = new controllers.javascript.ReverseAssets();
[error]                                                                                             ^
[error] C:\Server\trunk\target\scala-2.11\src_managed\main\controllers\routes.java:13: error: package controllers.javascript does not exist
[error] public static final controllers.javascript.ReverseApplication Application = new controllers.javascript.ReverseApplication();
[error]                                                                                                       ^
[error] C:\Server\trunk\target\scala-2.11\src_managed\main\controllers\routes.java:18: error: package controllers.ref does not exist
[error] public static final controllers.ref.ReverseAssets Assets = new controllers.ref.ReverseAssets();
[error]                                                                               ^
[error] C:\Server\trunk\target\scala-2.11\src_managed\main\controllers\routes.java:19: error: package controllers.ref does not exist
[error] public static final controllers.ref.ReverseApplication Application = new controllers.ref.ReverseApplication();
[error]                                                                                         ^
[error] 12 errors
[error] (compile:compile) javac returned nonzero exit code
[error] Total time: 16 s, completed Oct 31, 2014 11:18:25 AM

其他时候我会在 sbt clean 编译时遇到此错误:

[info] Compiling 15 Scala sources and 1 Java source to C:\Server\trunk\target\scala-2.11\classes...
[trace] Stack trace suppressed: run last compile:compile for the full output.
[error] (compile:compile) java.lang.NoClassDefFoundError: Lcontrollers/ReverseAssets;
[error] Total time: 45 s, completed Oct 31, 2014 11:45:49 AM

然后我将退出 sbt，然后再次运行 sbt cleancompile，一切似乎都编译正常。我什至会运行 activator run，一切都编译正常，但没有一条路线被识别:

# Home page
GET     /               controllers.Application.index

GET     /login          controllers.Application.login

然后我会在使用 activator run 进行编译时遇到错误:

[info] Compiling 15 Scala sources and 1 Java source to C:\Server\trunk\target\scala-2.11\classes...
[error] C:\Server\trunk\target\scala-2.11\src_managed\main\controllers\routes.java:13: error: cannot find symbol
[error] public static final controllers.javascript.ReverseApplication Application = new controllers.javascript.ReverseApplication()
[error]                                           ^
[error]   symbol:   class ReverseApplication
[error]   location: package controllers.javascript
[error] C:\Server\trunk\target\scala-2.11\src_managed\main\controllers\routes.java:13: error: cannot find symbol
[error] public static final controllers.javascript.ReverseApplication Application = new controllers.javascript.ReverseApplication()
[error]                                                                                                       ^
[error]   symbol:   class ReverseApplication
[error]   location: package controllers.javascript
[error] 2 errors
[error] (compile:compile) javac returned nonzero exit code
[error] application -

! @6k3l8fool - Internal server error, for (GET) [/] ->

play.PlayExceptions$CompilationException: Compilation error[error: cannot find symbol]
    at play.PlayExceptions$CompilationException$.apply(PlayExceptions.scala:27) ~[na:na]
    at play.PlayExceptions$CompilationException$.apply(PlayExceptions.scala:27) ~[na:na]
    at scala.Option.map(Option.scala:145) ~[scala-library-2.11.1.jar:na]
    at play.PlayReloader$$anon$1$$anonfun$play$PlayReloader$$anon$$taskFailureHandler$1.apply(PlayReloader.scala:235) ~[na:na]
    at play.PlayReloader$$anon$1$$anonfun$play$PlayReloader$$anon$$taskFailureHandler$1.apply(PlayReloader.scala:230) ~[na:na]
[warn] play - No application found at invoker init

然后我运行 activator clean run 并得到完全不同的错误:

[info] Compiling 15 Scala sources and 1 Java source to C:\Server\trunk\target\scala-2.11\classes...
java.lang.IllegalArgumentException: requirement failed: Source file 'C:\Server\trunk\target\scala-2.11\classes\Routes$$anonfun$routes$1$$anonfun$applyOrElse$4.class' does not exist.
    at scala.Predef$.require(Predef.scala:233)
    at sbt.IO$.copyFile(IO.scala:580)
    at sbt.IO$.sbt$IO$$copyImpl(IO.scala:559)
    at sbt.IO$$anonfun$copy$1.apply(IO.scala:548)
    at sbt.IO$$anonfun$copy$1.apply(IO.scala:548)
    at scala.Function$$anonfun$tupled$1.apply(Function.scala:77)
    at scala.Function$$anonfun$tupled$1.apply(Function.scala:76)
    at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
    at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
    at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
    at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:47)
    at scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
    at scala.collection.AbstractTraversable.map(Traversable.scala:105)
    at sbt.IO$.copy(IO.scala:548)
    at play.PlayCommands$$anonfun$PostCompile$1.apply(PlayCommands.scala:162)
    at play.PlayCommands$$anonfun$PostCompile$1.apply(PlayCommands.scala:76)
    at scala.Function8$$anonfun$tupled$1.apply(Function8.scala:35)
    at scala.Function8$$anonfun$tupled$1.apply(Function8.scala:34)
    at scala.Function1$$anonfun$compose$1.apply(Function1.scala:47)
    at sbt.$tilde$greater$$anonfun$$u2219$1.apply(TypeFunctions.scala:42)
    at sbt.std.Transform$$anon$4.work(System.scala:64)
    at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:237)
    at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:237)
    at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:18)
    at sbt.Execute.work(Execute.scala:244)
    at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:237)
    at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:237)
    at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:160)
    at sbt.CompletionService$$anon$2.call(CompletionService.scala:30)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:744)
[error] (compile:compile) java.lang.IllegalArgumentException: requirement failed: Source file 'C:\Server\AuthWebManager\trunk\target\scala-2.11\classes\Routes$$anonfun$routes$1$$anonfun$applyOrElse$4.
class' does not exist.
[error] application -

! @6k3l90dc5 - Internal server error, for (GET) [/] ->

play.PlayExceptions$UnexpectedException: Unexpected exception[IllegalArgumentException: requirement failed: Source file 'C:\Server\AuthWebManager\trunk\target\scala-2.11\classes\Routes$$anonfun$routes
$1$$anonfun$applyOrElse$4.class' does not exist.]
    at play.PlayReloader$$anon$1$$anonfun$play$PlayReloader$$anon$$taskFailureHandler$1.apply(PlayReloader.scala:237) ~[na:na]
    at play.PlayReloader$$anon$1$$anonfun$play$PlayReloader$$anon$$taskFailureHandler$1.apply(PlayReloader.scala:230) ~[na:na]
    at scala.Option.map(Option.scala:145) ~[scala-library-2.11.1.jar:na]
    at play.PlayReloader$$anon$1.play$PlayReloader$$anon$$taskFailureHandler(PlayReloader.scala:230) ~[na:na]
    at play.PlayReloader$$anon$1$$anonfun$reload$2.apply(PlayReloader.scala:90) ~[na:na]
Caused by: java.lang.IllegalArgumentException: requirement failed: Source file 'C:\Server\trunk\target\scala-2.11\classes\Routes$$anonfun$routes$1$$anonfun$applyOrElse$4.class' does not
exist.
    at scala.Predef$.require(Predef.scala:233) ~[scala-library-2.11.1.jar:na]
    at sbt.IO$.copyFile(IO.scala:580) ~[na:na]
    at sbt.IO$.sbt$IO$$copyImpl(IO.scala:559) ~[na:na]
    at sbt.IO$$anonfun$copy$1.apply(IO.scala:548) ~[na:na]
    at sbt.IO$$anonfun$copy$1.apply(IO.scala:548) ~[na:na]
[warn] play - No application found at invoker init

我也遇到了一些不同的错误，但为了简洁起见，我不会在这里写下它们。我尝试过删除 .sbt 和 .ivy2/cache 文件夹的建议，但这并没有解决问题。

那么我该怎么做才能让我的 Play 应用程序编译和运行时不会出现看似不确定的错误？

Answer 1

我遇到了类似的问题。我正在使用带有激活器的 Eclipse。当 eclipse 尝试在与 Play 相同的目录中构建应用程序时，看起来问题出在 eclipse 上。我禁用了 Eclipse 中的“自动构建”设置，到目前为止它工作正常。看看这个线程:

https://groups.google.com/forum/#!topic/play-framework/4RnbqEk-muM