build.sbt

name := "JavaRDDLike bug repro"

version := "1.0"

scalaVersion := "2.11.3"

RDD.scala

import java.util.Comparator

trait RDDLike[T] {
  def max(comp: Comparator[T]): T = {
    (1.0).asInstanceOf[T]
  }
}

class DoubleRDD extends RDDLike[java.lang.Double] {
  // This space intentionally left blank.
}

Test.java

import java.util.Comparator;


public class Test {
  private static class DoubleComparator implements Comparator<Double> {
    public int compare(Double o1, Double o2) {
      return o1.compareTo(o2);
    }
  }

  public static void main(String[] args) {
    DoubleRDD rdd = new DoubleRDD();
    RDDLike<Double> rddLike = rdd;

    // This call works fine:
    double rddLikeMax = rddLike.max(new DoubleComparator());
    // This call fails at runtime:
    // java.lang.NoSuchMethodError: DoubleRDD.max(Ljava/util/Comparator;)Ljava/lang/Double;
    double rddMax = rdd.max(new DoubleComparator());
  }

}