Question

我是Scala，SBT和Play的新手，所以请将此视为NooB questtion。我正在为竞赛构建一个示例Play应用程序，并以reactive-stocks应用程序作为模板开始。为了自然地扩展其功能，我需要添加安全性，JDBC连接等。

这是模板中提供的原始build.sbt文件 -

scalaVersion := "2.11.1"

libraryDependencies ++= Seq(
  ws, // Play's web services module
  "com.typesafe.akka" %% "akka-actor" % "2.3.4",
  "com.typesafe.akka" %% "akka-slf4j" % "2.3.4",
  "org.webjars" % "bootstrap" % "2.3.1",
  "org.webjars" % "flot" % "0.8.0",
  "com.typesafe.akka" %% "akka-testkit" % "2.3.4" % "test"
)

在此我将“com.typesafe.play”％“anorm_2.11”％“2.4.0-M1”添加到slf4j依赖项之后的列表中，并且应用程序能够编译并运行。

现在，如果我添加任何“com.typesafe.play”％“filters-helpers_2.11”％“2.4.0-M1”或“com.typesafe.play”％“play-jdbc_2.11”％“ 2.4.0-M1" ，播放应用程序无法在Activator web ui中编译，消息为“（echo：run）java.lang.ClassNotFoundException：play.core.server.NettyServer”。

Netty Server类肯定在类路径中。那么问题是什么？

我正在使用JDK 8.失败的配置是

scalaVersion := "2.11.1"

libraryDependencies ++= Seq(
  ws, // Play's web services module
  "com.typesafe.akka" %% "akka-actor" % "2.3.4",
  "com.typesafe.akka" %% "akka-slf4j" % "2.3.4",
  "org.webjars" % "bootstrap" % "2.3.1",
  "org.webjars" % "flot" % "0.8.0",
  "com.typesafe.akka" %% "akka-testkit" % "2.3.4" % "test",
  "com.typesafe.play" % "anorm_2.11" % "2.4.0-M1",
  "com.typesafe.play" % "filters-helpers_2.11" % "2.4.0-M1",
  "com.typesafe.play" % "play-jdbc_2.11" % "2.4.0-M1"
)

带有日志

Reapplying settings...
Set current project to reactive-stocks (in build file:/D:/Miura/reactive-stocks/)
Reapplying settings...
Set current project to reactive-stocks (in build file:/D:/Miura/reactive-stocks/)
Reapplying settings...
Set current project to reactive-stocks (in build file:/D:/Miura/reactive-stocks/)
Reapplying settings...
Set current project to reactive-stocks (in build file:/D:/Miura/reactive-stocks/)
Running task... Cancel: sbt.TaskCancellationStrategy$Null$@571cf19b, check cycles: false
play.core.server.NettyServer
(echo:run) java.lang.ClassNotFoundException: play.core.server.NettyServer
Run complete.

Answer 1

正如Google group所述，问题在于混合了Play库版本。股票模板适用于Play 2.3.3，但我试图添加的库是2.4。

build.sbt中的此配置有效

    libraryDependencies ++= Seq(
     jdbc,
     anorm,
     cache,
     ws

Answer 2

我也有这个错误：

 Exception in thread "main" java.lang.NoClassDefFoundError: play/core/server/NettyServer
 Caused by: java.lang.ClassNotFoundException: play.core.server.NettyServer
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)

但我的问题更愚蠢：权限。检查正在执行应用程序的用户是否具有正确的权限。

只是为了记录，所以其他人可以节省时间。

java.lang.ClassNotFoundException：play.core.server.NettyServer，当更多播放库添加到build.sbt时

Netty Server类肯定在类路径中。那么问题是什么？

2 个答案: