build.properties

sbt.version = 1.2.8

build.sbt

name := "scalajava"

version := "0.1"

scalaVersion := "2.12.8"

CallImpl.scala

import com.sun.org.apache.xpath.internal.XPathContext

class CallImpl extends CallInterface {
//  override def call(context: String, arguments: Array[Sequence[_ <: Item[_ <: Item[_]]]]): Sequence[_ <: Item[_ <: Item[_]]] = ???
  override def call(context: XPathContext, arguments: Array[Sequence[_ <: Item[_]]]): Sequence[_] = ???
}

CallInterface.java

import com.sun.org.apache.xpath.internal.XPathContext;

public interface CallInterface {
    Sequence<?> call(XPathContext context, Sequence[] arguments);
}

compile_log

dmitin@dmitin-HP-Pavilion-Laptop:/media/data/Projects/scalajava$ sbt compile
[info] Loading settings for project global-plugins from idea.sbt ...
[info] Loading global plugins from /home/dmitin/.sbt/1.0/plugins
[info] Loading project definition from /media/data/Projects/scalajava/project
[info] Loading settings for project scalajava from build.sbt ...
[info] Set current project to scalajava (in build file:/media/data/Projects/scalajava/)
[info] Executing in batch mode. For better performance use sbt's shell
[info] Compiling 1 Scala source and 3 Java sources to /media/data/Projects/scalajava/target/scala-2.12/classes ...
[warn] /media/data/Projects/scalajava/src/main/java/CallInterface.java:1:1: com.sun.org.apache.xpath.internal.XPathContext is internal proprietary API and may be removed in a future release
[warn] import com.sun.org.apache.xpath.internal.XPathContext;
[warn] /media/data/Projects/scalajava/src/main/java/CallInterface.java:4:1: com.sun.org.apache.xpath.internal.XPathContext is internal proprietary API and may be removed in a future release
[warn]     Sequence<?> call(XPathContext context, Sequence[] arguments);
[info] Done compiling.
[success] Total time: 3 s, completed 05.04.2019 1:24:42

Item.java

public interface Item<T extends Item<?>> {
}

Sequence.java

public interface Sequence<T extends Item<?>> {
}