<dubbo:registry address="zookeeper://localhost:2181" /> @Service public class HelloServiceImpl implements HelloService { } <dubbo:registry address="zookeeper://localhost:2181" /> @Reference private HelloService helloService; <dubbo:service loadbalance="roundrobin" /> <dubbo:reference loadbalance="random" /> <dubbo:service retries="3" /> <dubbo:reference cluster="failsafe" /> <dubbo:service executes="10" /> <dubbo:reference actives="20" />