public class CompilerError {

    public static void main(String[] args) {
        Bar bar = a -> a.aMethod((ClassB) () -> new ClassB() {
            public void bMethod() {
            }
        });
    }

    public static interface Bar {
        void barMethod(ClassA a);
    }

    public interface ClassA {
        public void aMethod(Object t);
    }

    public interface ClassB {
        public void bMethod();
    }

}