Accessing Scala Instance Variables from Java in Eclipse

Question

I suspect that I am missing something very basic, but I cannot access the Scala fields from Java code:

package test;

class TestScala (myNumber : Int){
    val myNum : Int = myNumber;
}


package test;

import test.TestScala;

public class TestJava {
    public static void main(String[] args) {
        TestScala t = new TestScala(2);

        int x = t.myNum;

        System.out.println(x);      
    }
}

Productivity:

Exception in thread "main" java.lang.Error: Unresolved compilation problem: Field TestScala.myNum not displayed

This Assembla ticket touches the subject, but my tiny skull cannot make out a useful solution:

http://scala-ide.assembla.com/spaces/scala-ide/tickets/1238-objects-not-visible-to-java-in-mixed-java-scala-eclipse-project

thank

Answer 1

Val fields are accessible through methods with the same name.

scalac -Xprint: typer will show you that:

class TestScala extends java.lang.Object with ScalaObject {
  <paramaccessor> private[this] val myNumber: Int = _;
  def this(myNumber: Int): $iw.$iw.TestScala = {
    TestScala.super.this();
    ()
  };
  private[this] val myNum: Int = TestScala.this.myNumber;
  <stable> <accessor> def myNum: Int = TestScala.this.myNum
}

, Java int x = t.myNum(); .