ClassCastException when tries to convert numeric return value of overridden methods

[slavchev]

Let's have the following Java class

public class Class1 {
  public long getValue() {
    ... 
  }
}

This class is extended in JavaScript as follows:

var MyClass1 = Class1.extend({
  getValue: function() {
    return 1;
  }
});
var mc1 = new MyClass1();

When Java calls getValue of mc1 it fails with ClassCastException.