Extend Scala Class in Java -> JetBrains Idea

Hi 

I'm doing simple test.
Extend Scala class in Java

object Start {
  def main(args: Array[String]) {
    val scalaClassObj = new ScalaClass("Dom", "Sien")
    println(scalaClassObj.name)
    println(scalaClassObj.surname)

    val javaClassObj = new JavaClass("Dom2", "Sien2", 31)
    println(javaClassObj.name)
    println(javaClassObj.surname)
    println(javaClassObj.getAge)
  }
}



class ScalaClass(var name: String, var surname: String)


public class JavaClass extends ScalaClass {
    private int age;

    public JavaClass(String name, String surname, int age) {
        super(name, surname);
        this.age = age;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}


Everything working ok

Dom
Sien
Dom2
Sien2
31

but Idea give me some error



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Why ?

Am I doing something wrong ?

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