sbt to exclude source directory

How do I config build.sbt to exclude src/main/java d开发者_如何学运维irectory? I would like to put my Java sources there but I don't want to compile them. Also, can I exclude a file or group of files specify with RE. Can these be easily configured in build.sbt?

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javaSource and scalaSource are inputs to unmanagedSourceDirectories. You can then set unmanagedSourceDirectories to be scalaSource only:

unmanagedSourceDirectories in Compile <<=
   scalaSource in Compile apply ( (s: File) => s :: Nil)

or a bit shorter:

unmanagedSourceDirectories in Compile <<= (scalaSource in Compile)( _ :: Nil)

See Classpaths, sources, and resources for details. Also, the inspect command is useful for determining how settings are built up from other settings.

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Well, there might be a better way but I'd add this to my build.sbt:

javaSource in Compile := file("some/path/that/doesnt/exist")