Closed
Description
minimized code
object foo {
def main(args: Array[String]): Unit = {
println("Dotty")
// calling from Java does not compile
val config = new SimpleConfig
config.checkValid(config, "foo")
}
import scala.annotation.varargs
trait Config {
@varargs def checkValid(reference: Config, restrictToPaths: String*): Unit
}
class SimpleConfig extends Config {
// This method in Config uses @varargs so it can be called from Java with varargs
// See https://github.com/scala/bug/issues/10658
// Now the code goes through the Scala varargs method but we need this one for Java
def checkValid(reference: Config, restrictToPaths: Array[String]): Unit = {
println("called from Java checkValid")
checkValid(reference, restrictToPaths.toIndexedSeq: _*)
}
override def checkValid(reference: Config, restrictToPaths: String*): Unit = {
println("called from Scala checkValid")
}
}
}expectation
Calling from Scala works as expected compared to Scala 2. In Dotty calling from Java does not compile and it looks like it calls the Scala method based on the error.
[error] /Users/eric/workspace/sconfig/examples/java/simple-lib/src/main/java/simplelib/SimpleLibContext.java:21:1: incompatible types: java.lang.String cannot be converted to scala.collection.immutable.Seq<java.lang.String>
[error] config.checkValid(ConfigFactory.defaultReference(), "simple-lib");Reference used when porting https://github.com/ekrich/sconfig from Java to Scala. scala/bug#10658