scala - How to make an sbt project reference external java sources -

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could post code example of how reference external java source directory in sbt project?

if following 

override def mainsourceroots = super.mainsourceroots +++ externalsourcepath

the sbt compile task find , compile java sources fail. e.g. 

[info] compilation successful. java.lang.runtimeexception: path /full/path/to/java/class/com/foo/bar/someclass.java not in .

sbt 0.9 support external sub-projects. until then, suggest build other 1 jar, , drop results ./lib.


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