No provider available for the service

zookeeper注册成功，订阅成功，但是却说服务没有提供者。
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'SayHelloTo': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException: Failed to check the status of the service com.huatai.usercenter.api.test.SayHelloToClient. No provider available for the service com.huatai.usercenter.api.test.SayHelloToClient from the url zookeeper://localhost:2181/com.alibaba.dubbo.registry.RegistryService?application=hehe_consumer&dubbo=2.8.4&interface=com.huatai.usercenter.api.test.SayHelloToClient&methods=sayHello&pid=4572&revision=0.0.1-SNAPSHOT&side=consumer&timestamp=1490171679141 to the consumer 160.6.70.215 use dubbo version 2.8.4
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:151)
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:103)
at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1514)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:252)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195)
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:973)
at com.test.Consumer.main(Consumer.java:81)
Caused by: java.lang.IllegalStateException: Failed to check the status of the service com.huatai.usercenter.api.test.SayHelloToClient. No provider available for the service com.huatai.usercenter.api.test.SayHelloToClient from the url zookeeper://localhost:2181/com.alibaba.dubbo.registry.RegistryService?application=hehe_consumer&dubbo=2.8.4&interface=com.huatai.usercenter.api.test.SayHelloToClient&methods=sayHello&pid=4572&revision=0.0.1-SNAPSHOT&side=consumer&timestamp=1490171679141 to the consumer 160.6.70.215 use dubbo version 2.8.4
at com.alibaba.dubbo.config.ReferenceConfig.createProxy(ReferenceConfig.java:420)
at com.alibaba.dubbo.config.ReferenceConfig.init(ReferenceConfig.java:300)
at com.alibaba.dubbo.config.ReferenceConfig.get(ReferenceConfig.java:138)
at com.alibaba.dubbo.config.spring.ReferenceBean.getObject(ReferenceBean.java:65)
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:144)
... 6 more

http://blog.csdn.net/u012371450/article/details/52087211

刚刚遇到类似的问题，在Linux服务器端开放20880例外端口就解决了（把3306换成20880）。

参考链接http://www.pc811.com/6/7/26004.html

http://blog.csdn.net/lin_guangling/article/details/78373247