将 class 添加到 sbt 插件的 class 路径

Question

I am using an sbt plugin to do some style checks on my code: https://github.com/sksamuel/sbt-scapegoat . On one of my projects, let's call this my-app, I added the sbt plugin to the plugins.sbt file inside the project directory.

The tool runs fine and everything seems to work as expected. This plugin has a compiler flag that allows for custom inspections to be passed in.

I therefore created another project, my-inspections , in which I added a custom inspection using the same classes as the sbt plugin. I then added my-inspections as an unmanaged jar in my-app. I did so by adding the following line to my plugins.sbt file:

unmanagedJars in Compile += {
  Attributed.blank(file("lib/my-inspections.jar"))
}

Now, when I try to use the custom inspection class I added in my-inspections and pass it to the provided compiler flag, I get an error saying it cannot find the class. I passed in the fully qualified class name of the custom inspection I added. The sbt plugin then does something like:

Class.forName(inspection).getConstructor().newInstance().asInstanceOf[Inspection]

which causes a ClassNotFoundException .

How can the sbt plugin successfully load the Class I created that has the custom inspection?

Answer 1

If you have the classes in a jar file, try putting the jar file in project/lib . The project directory is an sbt build for your project; an sbt plugin belongs to the project build. The lib directory in project is where you should be able to put unmanaged dependencies of the project.