다음과 같은 interface를 구현한 @FunctionalInterface public interface ServiceSupplier { T findOne(SomeParameter someParameter); } @FunctionalInterface public interface ServiceListSupplier { List findList(SomeParameter someParameter); } 다음과 같은 service가 있다고 가정해 보자. @Service public class SomeService implements ServiceSupplier, ServiceListSupplier { @Override public SomeObject findOne(SomeParameter someParame..