java启动报错java.lang.ClassNotFoundException: org.jboss.netty.channel.ChannelFactory ,这个是因为依赖的netty没有引入过来，最新的4。0版本是nettyall，不兼容，必须使用netty，3.6版本

[1] 添加maven

     <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty</artifactId>
            <version>3.6.10.Final</version>
        </dependency>

[2]补充全部报错信息

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'tv.rr.comment.feign.UserService': FactoryBean threw exception on object creation; nested exception is java.lang.NoClassDefFoundError: org/jboss/netty/channel/ChannelFactory
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:178)
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:101)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1644)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getObjectForBeanInstance(AbstractAutowireCapableBeanFactory.java:1174)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:257)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:251)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.addCandidateEntry(DefaultListableBeanFactory.java:1322)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1288)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1098)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1062)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:581)
    ... 91 common frames omitted
Caused by: java.lang.NoClassDefFoundError: org/jboss/netty/channel/ChannelFactory
    at com.alibaba.dubbo.remoting.transport.netty.NettyTransporter.bind(NettyTransporter.java:33)
    at com.alibaba.dubbo.remoting.Transporter$Adpative.bind(Transporter$Adpative.java)
    at com.alibaba.dubbo.remoting.Transporters.bind(Transporters.java:48)
    at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchanger.bind(HeaderExchanger.java:41)
    at com.alibaba.dubbo.remoting.exchange.Exchangers.bind(Exchangers.java:63)
    at com.alibaba.dubbo.rpc.protocol.dubbo.DubboProtocol.createServer(DubboProtocol.java:329)
    at com.alibaba.dubbo.rpc.protocol.dubbo.DubboProtocol.openServer(DubboProtocol.java:308)
    at com.alibaba.dubbo.rpc.protocol.dubbo.DubboProtocol.export(DubboProtocol.java:258)
    at com.alibaba.dubbo.rpc.protocol.ProtocolListenerWrapper.export(ProtocolListenerWrapper.java:56)
    at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper.export(ProtocolFilterWrapper.java:55)
    at com.alibaba.dubbo.rpc.Protocol$Adpative.export(Protocol$Adpative.java)
    at com.alibaba.dubbo.registry.integration.RegistryProtocol.doLocalExport(RegistryProtocol.java:153)
    at com.alibaba.dubbo.registry.integration.RegistryProtocol.export(RegistryProtocol.java:107)
    at com.alibaba.dubbo.rpc.protocol.ProtocolListenerWrapper.export(ProtocolListenerWrapper.java:54)
    at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper.export(ProtocolFilterWrapper.java:53)
    at com.alibaba.dubbo.rpc.Protocol$Adpative.export(Protocol$Adpative.java)
    at com.alibaba.dubbo.config.ServiceConfig.doExportUrlsFor1Protocol(ServiceConfig.java:489)
    at com.alibaba.dubbo.config.ServiceConfig.doExportUrls(ServiceConfig.java:285)
    at com.alibaba.dubbo.config.ServiceConfig.doExport(ServiceConfig.java:246)
    at com.alibaba.dubbo.config.ServiceConfig.export(ServiceConfig.java:145)
    at com.alibaba.dubbo.config.spring.ServiceBean.onApplicationEvent(ServiceBean.java:110)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:400)
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:406)
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:354)
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:886)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:551)
    at org.springframework.cloud.context.named.NamedContextFactory.createContext(NamedContextFactory.java:117)
    at org.springframework.cloud.context.named.NamedContextFactory.getContext(NamedContextFactory.java:85)
    at org.springframework.cloud.context.named.NamedContextFactory.getInstance(NamedContextFactory.java:126)
    at org.springframework.cloud.sleuth.instrument.web.client.feign.TraceFeignContext.getInstance(TraceFeignContext.java:45)
    at org.springframework.cloud.openfeign.FeignClientFactoryBean.get(FeignClientFactoryBean.java:205)
    at org.springframework.cloud.openfeign.FeignClientFactoryBean.feign(FeignClientFactoryBean.java:84)
    at org.springframework.cloud.openfeign.FeignClientFactoryBean.getObject(FeignClientFactoryBean.java:233)
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:171)
    ... 102 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.jboss.netty.channel.ChannelFactory
    at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 139 common frames omitted