<bean id="userService" class="com.example.UserService"> <dubbo:service interface="com.example.UserInterface" ref="userService"/> <dubbo:registry address="zookeeper://127.0.0.1:2181" /> <dubbo:protocol name="dubbo" port="20880" /> <bean id="userInterface" class="com.example.UserInterface"> <dubbo:reference interface="com.example.UserInterface" id="userInterface" /> <dubbo:registry address="zookeeper://127.0.0.1:2181" />