Dubbo中消费端报错Caused by: java.lang.IllegalStateException: Failed to check the status of th

消费端代码：

@EnableAutoConfiguration
public class DubboConsumerBootstrap {

    private final Logger logger = LoggerFactory.getLogger(getClass());

    @Reference()
    private DemoService demoService;

    public static void main(String[] args) {
        SpringApplication.run(DubboConsumerBootstrap.class).close();
    }

    @Bean
    public ApplicationRunner runner() {
        return args -> logger.info(demoService.sayHello("mercyblitz"));
    }
}

报错：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dubboConsumerBootstrap': Injection of @org.apache.dubbo.config.annotation.Reference dependencies is failed; nested exception is java.lang.IllegalStateException: Failed to check the status of the service com.dubbo.example.DemoService. No provider available for the service com.dubbo.example.DemoService from the url zookeeper://127.0.0.1:2181/org.apache.dubbo.registry.RegistryService?application=consumer&dubbo=2.0.2&interface=com.dubbo.example.DemoService&lazy=false&methods=sayHello&pid=18132&qos-enable=false®ister.ip=192.168.93.1&release=2.7.2&side=consumer&sticky=false×tamp=1562853955673 to the consumer 192.168.93.1 use dubbo version 2.7.2
	at org.apache.dubbo.config.spring.beans.factory.annotation.AnnotationInjectedBeanPostProcessor.postProcessPropertyValues(AnnotationInjectedBeanPostProcessor.java:134) ~[dubbo-2.7.2.jar:2.7.2]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1416) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:592) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:843) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877) ~[spring-context-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549) ~[spring-context-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
	at com.dubbo.example.consumer.DubboConsumerBootstrap.main(DubboConsumerBootstrap.java:24) [classes/:na]
Caused by: java.lang.IllegalStateException: Failed to check the status of the service com.dubbo.example.DemoService. No provider available for the service com.dubbo.example.DemoService from the url zookeeper://127.0.0.1:2181/org.apache.dubbo.registry.RegistryService?application=consumer&dubbo=2.0.2&interface=com.dubbo.example.DemoService&lazy=false&methods=sayHello&pid=18132&qos-enable=false®ister.ip=192.168.93.1&release=2.7.2&side=consumer&sticky=false×tamp=1562853955673 to the consumer 192.168.93.1 use dubbo version 2.7.2
	at org.apache.dubbo.config.ReferenceConfig.createProxy(ReferenceConfig.java:418) ~[dubbo-2.7.2.jar:2.7.2]
	at org.apache.dubbo.config.ReferenceConfig.init(ReferenceConfig.java:329) ~[dubbo-2.7.2.jar:2.7.2]
	at org.apache.dubbo.config.ReferenceConfig.get(ReferenceConfig.java:250) ~[dubbo-2.7.2.jar:2.7.2]
	at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor$ReferenceBeanInvocationHandler.init(ReferenceAnnotationBeanPostProcessor.java:173) ~[dubbo-2.7.2.jar:2.7.2]
	at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor$ReferenceBeanInvocationHandler.access$100(ReferenceAnnotationBeanPostProcessor.java:146) ~[dubbo-2.7.2.jar:2.7.2]
	at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.buildInvocationHandler(ReferenceAnnotationBeanPostProcessor.java:140) ~[dubbo-2.7.2.jar:2.7.2]
	at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.buildProxy(ReferenceAnnotationBeanPostProcessor.java:123) ~[dubbo-2.7.2.jar:2.7.2]
	at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.doGetInjectedBean(ReferenceAnnotationBeanPostProcessor.java:119) ~[dubbo-2.7.2.jar:2.7.2]
	at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.doGetInjectedBean(ReferenceAnnotationBeanPostProcessor.java:52) ~[dubbo-2.7.2.jar:2.7.2]
	at org.apache.dubbo.config.spring.beans.factory.annotation.AnnotationInjectedBeanPostProcessor.getInjectedObject(AnnotationInjectedBeanPostProcessor.java:337) ~[dubbo-2.7.2.jar:2.7.2]
	at org.apache.dubbo.config.spring.beans.factory.annotation.AnnotationInjectedBeanPostProcessor$AnnotatedFieldElement.inject(AnnotationInjectedBeanPostProcessor.java:517) ~[dubbo-2.7.2.jar:2.7.2]
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
	at org.apache.dubbo.config.spring.beans.factory.annotation.AnnotationInjectedBeanPostProcessor.postProcessPropertyValues(AnnotationInjectedBeanPostProcessor.java:130) ~[dubbo-2.7.2.jar:2.7.2]
	... 16 common frames omitted

经查阅资料后，尝试关闭防火墙，并修改注解@@Reference，使其版本与服务端相同，最终解决问题。

public class DubboConsumerBootstrap {

    private final Logger logger = LoggerFactory.getLogger(getClass());

//    @Reference(version = "1.0.0", url = "dubbo://127.0.0.1:12345")
    @Reference(version = "1.0.0")
    private DemoService demoService;

    public static void main(String[] args) {
        SpringApplication.run(DubboConsumerBootstrap.class).close();
    }

    @Bean
    public ApplicationRunner runner() {
        return args -> logger.info(demoService.sayHello("mercyblitz"));
    }
}