Scala NoSuchMethodError when using traits from Java

JavaTest.java

public class JavaTest {
    public static void main(String[] args) {
       MyClass<Integer> x = new MyClass<Integer>();
       x.hello();
       x.myVal();
    }
}

ScalaTest.scala

trait MyTrait[T, This <: MyTrait[T, This]] {
  def x: This

  def myVal(): This = x

  def hello() = {System.out.println("HELLO")}
}

class MyClass[T]() extends MyTrait[T, MyClass[T]] {
  def x : MyClass[T] = new MyClass
}

object ScalaTest {
    def main(args: Array[String]) {
       val x : MyClass[Int] = new MyClass[Int]
       x.hello()
       x.myVal()
    }
}