如何使用VS Code and Metals运行现有的Scala项目？

Question

我是Scala的新手，我发现Scala IDE在我的机器上对于诸如搜索代码库和编辑代码之类的基本操作非常慢。我已经习惯了Visual Studio Code，很高兴找到this metals extension。

我能够“导入构建”并修复项目中诸如增加scala版本的问题，但我不确定如何重现此步骤以设置运行配置并实际在Scala IDE中启动我们的应用程序。

我们有一个包含大量项目的父文件夹和一个'consoleapp'项目，这是我们应用程序的主要入口点-它导入所有其他项目的逻辑/路由。

|____parent
| |____consoleapp
| |____project1
| |____project2 

我从consoleapp文件夹以及父文件夹中尝试了sbt run和sbt runMain consoleapp，但它们不起作用。

我不确定我们的设置中还有哪些其他相关信息-很高兴根据需要提供更多信息。

更新在下面添加更多详细信息：

consoleapp / build.sbt

name := "consoleapp"

version := "1.0"

scalaVersion := "2.12.10"

packMain := Map("consoleapp" -> "consoleapp")

libraryDependencies ++=  Seq (...)

我运行的命令的输出-sbt run和sbt runMain

从〜/ scala / parent运行

> sbt run                                                                                                                                                                 masterstate [0a8dab85] modified
[info] Loading settings for project global-plugins from metals.sbt,build.sbt ...
[info] Loading global plugins from /Users/pradhyo/.sbt/1.0/plugins
[info] Loading project definition from /Users/pradhyo/scala/parent/project
[info] Loading settings for project consoleapp from build.sbt ...
... 
Loading settings for all other projects in parent folder
...
[info] Loading settings for project parent from build.sbt ...
[info] Resolving key references (22435 settings) ...
[info] Set current project to parent (in build file:/Users/pradhyo/scala/parent/)
[error] java.lang.RuntimeException: No main class detected.
[error]     at scala.sys.package$.error(package.scala:30)
[error] stack trace is suppressed; run last Compile / bgRun for the full output
[error] (Compile / bgRun) No main class detected.
[error] Total time: 1 s, completed 18-Dec-2019 1:41:25 PM

从〜/ scala / parent运行

> sbt "runMain consoleapp.consoleapp"                                                                                                                                     masterstate [0a8dab85] modified
[info] Loading settings for project global-plugins from metals.sbt,build.sbt ...
[info] Loading global plugins from /Users/pradhyo/.sbt/1.0/plugins
[info] Loading project definition from /Users/pradhyo/scala/parent/project
[info] Loading settings for project consoleapp from build.sbt ...
... 
Loading settings for all other projects in parent folder
...
[info] Loading settings for project parent from build.sbt ...
[info] Resolving key references (22435 settings) ...
[info] Set current project to parent (in build file:/Users/pradhyo/scala/parent/)
[info] running consoleapp.consoleapp 
[error] (run-main-0) java.lang.ClassNotFoundException: consoleapp.consoleapp
[error] java.lang.ClassNotFoundException: consoleapp.consoleapp
[error]     at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
[error] stack trace is suppressed; run last Compile / bgRunMain for the full output
[error] Nonzero exit code: 1
[error] (Compile / runMain) Nonzero exit code: 1
[error] Total time: 0 s, completed 18-Dec-2019 1:46:21 PM

从〜/ scala / parent / consoleapp运行

> sbt run                                                                                                                                                                 masterstate [0a8dab85] modified
[info] Loading settings for project global-plugins from metals.sbt,build.sbt ...
[info] Loading global plugins from /Users/pradhyo/.sbt/1.0/plugins
[info] Loading project definition from /Users/pradhyo/scala/parent/consoleapp/project
[info] Loading settings for project consoleapp from build.sbt ...
[info] Set current project to consoleapp (in build file:/Users/pradhyo/scala/parent/consoleapp/)
[error] java.lang.RuntimeException: No main class detected.
[error]     at scala.sys.package$.error(package.scala:30)
[error] stack trace is suppressed; run last Compile / bgRun for the full output
[error] (Compile / bgRun) No main class detected.
[error] Total time: 0 s, completed 18-Dec-2019 1:49:26 PM

从〜/ scala / parent / consoleapp运行

> sbt "runMain consoleapp"                                                                                                                                                masterstate [0a8dab85] modified
[info] Loading settings for project global-plugins from metals.sbt,build.sbt ...
[info] Loading global plugins from /Users/pradhyo/.sbt/1.0/plugins
[info] Loading project definition from /Users/pradhyo/scala/parent/consoleapp/project
[info] Loading settings for project consoleapp from build.sbt ...
[info] Set current project to consoleapp (in build file:/Users/pradhyo/scala/parent/consoleapp/)
[info] running consoleapp 
[error] (run-main-0) java.lang.ClassNotFoundException: consoleapp
[error] java.lang.ClassNotFoundException: consoleapp
[error]     at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
[error] stack trace is suppressed; run last Compile / bgRunMain for the full output
[error] Nonzero exit code: 1
[error] (Compile / runMain) Nonzero exit code: 1
[error] Total time: 1 s, completed 18-Dec-2019 1:50:06 PM

Answer 1

金属支持以下Scala版本2.13.0、2.13.1、2.12.8、2.12.9，2.12.10、2.12.7和2.11.12

这是我从他们的文档（doc）中注意到的。因此，它可以指出我在评论中提到的您和我的问题。

您的scalaVersion := "2.12.3"未在此处列出。