scala sbt 程序集“没有主要清单属性"； [英] scala sbt assembly "no main manifest attribute"

问题描述

我在 sbt 中使用组装插件来组装我的项目.但是通过java -jar xx.jar"运行时会发生错误 -

I use assembly plugin in sbt to assemble my project. But errors happen when run by "java -jar xx.jar" -

没有主要清单属性".

我认为这是因为我的 src/main/scala/ 目录中有两个文件，每个文件都有一个扩展 Application 的对象，这意味着在项目.但是我需要两个应用程序，一个是服务器，另一个是测试客户端.

I think it's because there are two files in my src/main/scala/ directory and each with an object extending Application which means there are two main entry in the project. But I need two applications, one is the server and the other is the test client.

如何在scala sbt 中处理这个two-main-entry 问题.提前致谢.

How to handle this two-main-entry problem in scala sbt. Thanks in advance.

推荐答案

在您的 SBT 构建文件中，定义主类.

In your SBT build file, define the main class.

如果您使用的是 build.sbt，则为:

If you are using build.sbt, then that would be:

mainClass in assembly := Some("com.domain.Main")

如果您使用的是 Build.scala，那么您可以执行以下操作:

If you are using Build.scala then you could do something like:

lazy val app = (project in file("app")).
  settings(assemblySettings: _*)
  settings(mainClass in assembly := Some("com.domain.Main"))

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