Throws exception - reported to ASF JIRA

bug.groovy

/**
 * Created by romasave on 11/17/15.
 */

class Main {
    static abstract class Inner {
        abstract int findA()
        int doSomething() {
            findA()
        }
    }
    static abstract class A {
        private int a = 7
        def inner = new Inner() {
            @Override
            int findA() {
                return a
            }
        }
        int doSomething() {
            inner.doSomething()
        }
        abstract void toBeImplemented()
    }
    static class Factory {
        A create() {
            new A() {
                @Override
                void toBeImplemented() {

                }
            }
        }
    }
    static void main(String[] args) {
        //def a = new A()
        //println a.doSomething()
        Factory f = new Factory()
        def aa = f.create()
        println aa.doSomething()
    }
}

exception.txt

$ groovy bug.groovy 
Caught: groovy.lang.MissingPropertyException: No such property: a for class: Main
groovy.lang.MissingPropertyException: No such property: a for class: Main
	at Main$Factory.propertyMissing(bug.groovy)
	at Main$Factory.getProperty(bug.groovy)
	at Main$Factory.this$dist$get$1(bug.groovy)
	at Main$Factory$1.propertyMissing(bug.groovy)
	at Main$A.getProperty(bug.groovy)
	at Main$A.this$dist$get$1(bug.groovy)
	at Main$A$1.propertyMissing(bug.groovy)
	at Main$Inner.getProperty(bug.groovy)
	at Main$A$1.findA(bug.groovy:17)
	at Main$Inner.doSomething(bug.groovy:9)
	at Main$Inner$doSomething.call(Unknown Source)
	at Main$A.doSomething(bug.groovy:21)
	at Main$A$doSomething.call(Unknown Source)
	at Main.main(bug.groovy:40)

translation.java

package com.company;

public class Main {
    static abstract class Inner {
        abstract int findA();
        int doSomething() {
            return findA();
        }
    }
    static abstract class A {
        private int a = 7;
        private Inner inner = new Inner() {
            @Override
            int findA() {
                return a;
            }
        };
        int doSomething() {
            return inner.doSomething();
        }
        abstract void toBeImplemented();
    }
    static class Factory {
        public A create() {
            return new A() {
                @Override
                void toBeImplemented() {

                }
            };
        }
    }
    public static void main(String[] args) {
        //def a = new A()
        //println a.doSomething()
        Factory f = new Factory();
        A aa = f.create();
        System.out.println(aa.doSomething());
    }

}