return String.format("provider(%s '%s', %s)", getTypeDisplayName(), getName(), getType());
        }
    }

    protected class ExistingNamedDomainObjectProvider<I extends T> extends AbstractNamedDomainObjectProvider<I> {

        public ExistingNamedDomainObjectProvider(String name, Class<I> type) {
            super(name, type);
        }

        @Override
        public void configure(Action<? super I> action) {

        return super.whenObjectRemoved(action);
    }

    // Cannot be private due to reflective instantiation
    public class ExistingTaskProvider<I extends T> extends ExistingNamedDomainObjectProvider<I> implements TaskProvider<I> {
        public ExistingTaskProvider(String name, Class<I> type) {
            super(name, type);
        }

        @Override
        public ValueProducer getProducer() {