Play 框架 - java.lang.RuntimeException：未检测到主类
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Play framework - java.lang.RuntimeException: No main class detected
提问by ad-inf
I am new to play framework and trying to run securesocial as in https://github.com/jaliss/securesocialUsing Play 2.3, Scala 2.10.0
我是玩框架的新手，并尝试在https://github.com/jaliss/securesocial 中使用 Play 2.3、Scala 2.10.0运行 securesocial
.sbt file is configured as
.sbt 文件配置为
name := "SecureSocial-parent"
version := Common.version
scalaVersion := Common.scalaVersion
lazy val core = project.in( file("module-code") ).enablePlugins(PlayScala)
lazy val scalaDemo = project.in( file("samples/scala/demo") ).enablePlugins(PlayScala).dependsOn(core)
lazy val javaDemo = project.in( file("samples/java/demo") ).enablePlugins(PlayJava).dependsOn(core)
lazy val root = project.in( file(".") ).aggregate(core, scalaDemo, javaDemo) .settings(
aggregate in update := false
)
But getting below error
但低于错误
~\securesocial-master>activator run
[info] Loading project definition from ~\securesocial-master\project
[info] Set current project to SecureSocial-parent (in build file:~/securesocial-master/)
java.lang.RuntimeException: No main class detected.
at scala.sys.package$.error(package.scala:27)
[trace] Stack trace suppressed: run last securesocial-master/compile:run for the full output.
[error] (securesocial-master/compile:run) No main class detected.
The project compiled successfully with many warnings on deprecated API Any pointer will be useful on how to resolve the no main class error
项目编译成功，但在已弃用的 API 上有许多警告 任何指针都将有助于解决无主类错误
采纳答案by vektor
As far as I understand it, SecureSocial-parent is just the library - it can be compiled, but cannot be runper se. You can only run the demo projects. For example, if you start activatorin the securesocialdirectory, you can type
据我了解， SecureSocial-parent 只是一个库 - 它可以编译，但本身不能运行。您只能运行演示项目。例如，如果activator在securesocial目录中启动，则可以键入
project javaDemo
to switch to the Java demo project and then
切换到 Java 演示项目，然后
~run
to run it.
运行它。
回答by user2861691
Just had the same problem. I am using the scala version though. I am running the sample app directly from the samples/scala/demo folder (by typing activator in the terminal).
刚刚有同样的问题。不过，我正在使用 Scala 版本。我直接从 samples/scala/demo 文件夹运行示例应用程序（通过在终端中键入 activator）。
The key to get it up and running was to add the following line to scalaDemo.sbt
启动并运行它的关键是将以下行添加到 scalaDemo.sbt
lazy val root = (project in file(".")).enablePlugins(PlayScala)
which should probably be
这应该是
lazy val root = (project in file(".")).enablePlugins(PlayJava)
into the javaDemo.sbt file, since you are running the Java version.
进入 javaDemo.sbt 文件，因为您正在运行 Java 版本。
I can see when the app starts that I have problems loading some gifs in the public folder, so maybe it is a wrong approach.
我可以看到应用程序启动时我在公共文件夹中加载一些 gif 时遇到问题，所以这可能是一种错误的方法。
