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Does Groovy have support for compiling with Java?

I really like the features in Groovy, but I can't get them to work with co-compilation at all. Example:

Bird.groovy:

trait FlyingAbility {
  String fly() { "I'm flying!" }
}

class Bird implements FlyingAbility {}

JavaClass.java:

public class JavaClass {
  public static void main(String[] args) {
    Bird b = new Bird();
    // FlyingAbility f = new Bird();
  }
}

Generated stub:

public class Bird
  extends java.lang.Object  implements
    FlyingAbility {
;
public  groovy.lang.MetaClass getMetaClass() { return (groovy.lang.MetaClass)null;}
public  void setMetaClass(groovy.lang.MetaClass mc) { }
public  java.lang.Object invokeMethod(java.lang.String method, java.lang.Object arguments) { return null;}
public  java.lang.Object getProperty(java.lang.String property) { return null;}
public  void setProperty(java.lang.String property, java.lang.Object value) { }
}

This leads to a java compiler that complains that FlyingAbility is not defined (and is not an interface). I find it hard to believe that this is not supported: am I missing something?

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