dubbo+springboot整合异常

2019独角兽企业重金招聘Python工程师标准>>> dubbo+springboot整合异常

在整合dubbo+springboot的项目，项目采用分布式开发。分别为springboot-server,springboot-client两个工程。使用main函数启动springboot-server，发现正常。打开dubbo-admin查看，发现服务也被注册进入zookeeper里面了。

但是在启动springboot-client的时候报异常：

java.lang.IllegalArgumentException: interface org.spring.springboot.dubbo.CityDubboService is not visible from class loader
   at com.alibaba.dubbo.common.bytecode.Proxy.getProxy(Proxy.java:98) ~[dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.common.bytecode.Proxy.getProxy(Proxy.java:67) ~[dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.rpc.proxy.javassist.JavassistProxyFactory.getProxy(JavassistProxyFactory.java:35) ~[dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.rpc.proxy.AbstractProxyFactory.getProxy(AbstractProxyFactory.java:49) ~[dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.rpc.proxy.wrapper.StubProxyFactoryWrapper.getProxy(StubProxyFactoryWrapper.java:60) ~[dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.rpc.ProxyFactory$Adpative.getProxy(ProxyFactory$Adpative.java) ~[na:2.5.3]
   at com.alibaba.dubbo.config.ReferenceConfig.createProxy(ReferenceConfig.java:426) ~[dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.config.ReferenceConfig.init(ReferenceConfig.java:300) ~[dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.config.ReferenceConfig.get(ReferenceConfig.java:138) ~[dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.config.spring.AnnotationBean.refer(AnnotationBean.java:302) ~[dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.config.spring.AnnotationBean.postProcessBeforeInitialization(AnnotationBean.java:233) ~[dubbo-2.5.3.jar:2.5.3]
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:409) [spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1620) [spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) [spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) [spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
   at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) [spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
   at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) [spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
   at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) [spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
   at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) [spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
   at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) [spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
   at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866) [spring-context-4.3.6.RELEASE.jar:4.3.6.RELEASE]
   at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542) [spring-context-4.3.6.RELEASE.jar:4.3.6.RELEASE]
   at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) [spring-boot-1.5.1.RELEASE.jar:1.5.1.RELEASE]
   at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:737) [spring-boot-1.5.1.RELEASE.jar:1.5.1.RELEASE]
   at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:370) [spring-boot-1.5.1.RELEASE.jar:1.5.1.RELEASE]
   at org.springframework.boot.SpringApplication.run(SpringApplication.java:314) [spring-boot-1.5.1.RELEASE.jar:1.5.1.RELEASE]
   at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162) [spring-boot-1.5.1.RELEASE.jar:1.5.1.RELEASE]
   at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151) [spring-boot-1.5.1.RELEASE.jar:1.5.1.RELEASE]
   at org.spring.springboot.ClientApplication.main(ClientApplication.java:20) [classes/:na]
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.7.0_15]
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[na:1.7.0_15]
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.7.0_15]
   at java.lang.reflect.Method.invoke(Method.java:601) ~[na:1.7.0_15]
   at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-1.5.1.RELEASE.jar:1.5.1.RELEASE]

已经很明显的提示，问题就在spring-boot-devtools-1.5.1.RELEASE.jar这个包里面，那这个包是哪里来的呢？原来是为了开发方便，我在maven里面引入了热部署插件：

dubbo+springboot整合异常

把这部分代码屏蔽掉，然后maven clean，重新启动，然后在client启动，调用接口的时候又报了一个错误：

Exception in thread "main" com.alibaba.dubbo.rpc.RpcException: Failed to invoke the method findCityByName in the service org.spring.springboot.dubbo.CityDubboService. Tried 3 times of the providers [192.168.0.34:20880] (1/1) from the registry 192.168.2.218:2181 on the consumer 192.168.0.34 using the dubbo version 2.5.3. Last error is: Failed to invoke remote method: findCityByName, provider: dubbo://192.168.0.34:20880/org.spring.springboot.dubbo.CityDubboService?anyhost=true&application=consumer&check=false&dubbo=2.5.3&interface=org.spring.springboot.dubbo.CityDubboService&methods=findCityByName&pid=6516&revision=1.0.0&side=consumer&timestamp=1508377074613&version=1.0.0, cause: com.alibaba.dubbo.rpc.RpcException: Failed to invoke remote proxy method findCityByName to registry://192.168.2.218:2181/com.alibaba.dubbo.registry.RegistryService?application=provider&dubbo=2.5.3&export=dubbo%3A%2F%2F192.168.0.34%3A20880%2Forg.spring.springboot.dubbo.CityDubboService%3Fanyhost%3Dtrue%26application%3Dprovider%26dubbo%3D2.5.3%26interface%3Dorg.spring.springboot.dubbo.CityDubboService%26methods%3DfindCityByName%26pid%3D396%26revision%3D1.0.0%26side%3Dprovider%26timestamp%3D1508376581314%26version%3D1.0.0&pid=396&registry=zookeeper&timestamp=1508376581236, cause: java.lang.ClassCastException: org.spring.springboot.dubbo.impl.CityDubboServiceImpl cannot be cast to org.spring.springboot.dubbo.impl.CityDubboServiceImpl
com.alibaba.dubbo.rpc.RpcException: Failed to invoke remote proxy method findCityByName to registry://192.168.2.218:2181/com.alibaba.dubbo.registry.RegistryService?application=provider&dubbo=2.5.3&export=dubbo%3A%2F%2F192.168.0.34%3A20880%2Forg.spring.springboot.dubbo.CityDubboService%3Fanyhost%3Dtrue%26application%3Dprovider%26dubbo%3D2.5.3%26interface%3Dorg.spring.springboot.dubbo.CityDubboService%26methods%3DfindCityByName%26pid%3D396%26revision%3D1.0.0%26side%3Dprovider%26timestamp%3D1508376581314%26version%3D1.0.0&pid=396&registry=zookeeper&timestamp=1508376581236, cause: java.lang.ClassCastException: org.spring.springboot.dubbo.impl.CityDubboServiceImpl cannot be cast to org.spring.springboot.dubbo.impl.CityDubboServiceImpl
   at com.alibaba.dubbo.rpc.proxy.AbstractProxyInvoker.invoke(AbstractProxyInvoker.java:76)
   at com.alibaba.dubbo.rpc.protocol.InvokerWrapper.invoke(InvokerWrapper.java:53)
   at com.alibaba.dubbo.rpc.filter.ExceptionFilter.invoke(ExceptionFilter.java:64)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.rpc.filter.TimeoutFilter.invoke(TimeoutFilter.java:42)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.monitor.support.MonitorFilter.invoke(MonitorFilter.java:75)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.rpc.protocol.dubbo.filter.TraceFilter.invoke(TraceFilter.java:78)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.rpc.filter.ContextFilter.invoke(ContextFilter.java:60)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.rpc.filter.GenericFilter.invoke(GenericFilter.java:112)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.rpc.filter.ClassLoaderFilter.invoke(ClassLoaderFilter.java:38)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.rpc.filter.EchoFilter.invoke(EchoFilter.java:38)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.rpc.protocol.dubbo.DubboProtocol$1.reply(DubboProtocol.java:108)
   at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.handleRequest(HeaderExchangeHandler.java:84)
   at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.received(HeaderExchangeHandler.java:170)
   at com.alibaba.dubbo.remoting.transport.DecodeHandler.received(DecodeHandler.java:52)
   at com.alibaba.dubbo.remoting.transport.dispatcher.ChannelEventRunnable.run(ChannelEventRunnable.java:82)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
   at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.IllegalArgumentException: java.lang.ClassCastException: org.spring.springboot.dubbo.impl.CityDubboServiceImpl cannot be cast to org.spring.springboot.dubbo.impl.CityDubboServiceImpl
   at com.alibaba.dubbo.common.bytecode.Wrapper1.invokeMethod(Wrapper1.java)
   at com.alibaba.dubbo.rpc.proxy.javassist.JavassistProxyFactory$1.doInvoke(JavassistProxyFactory.java:46)
   at com.alibaba.dubbo.rpc.proxy.AbstractProxyInvoker.invoke(AbstractProxyInvoker.java:72)
   ... 25 more
Caused by: java.lang.ClassCastException: org.spring.springboot.dubbo.impl.CityDubboServiceImpl cannot be cast to org.spring.springboot.dubbo.impl.CityDubboServiceImpl
   ... 28 more

   at com.alibaba.dubbo.rpc.cluster.support.FailoverClusterInvoker.doInvoke(FailoverClusterInvoker.java:101)
   at com.alibaba.dubbo.rpc.cluster.support.AbstractClusterInvoker.invoke(AbstractClusterInvoker.java:227)
   at com.alibaba.dubbo.rpc.cluster.support.wrapper.MockClusterInvoker.invoke(MockClusterInvoker.java:72)
   at com.alibaba.dubbo.rpc.proxy.InvokerInvocationHandler.invoke(InvokerInvocationHandler.java:52)
   at com.alibaba.dubbo.common.bytecode.proxy0.findCityByName(proxy0.java)
   at org.spring.springboot.dubbo.CityDubboConsumerService.printCity(CityDubboConsumerService.java:20)
   at org.spring.springboot.ClientApplication.main(ClientApplication.java:22)
Caused by: com.alibaba.dubbo.remoting.RemotingException: com.alibaba.dubbo.rpc.RpcException: Failed to invoke remote proxy method findCityByName to registry://192.168.2.218:2181/com.alibaba.dubbo.registry.RegistryService?application=provider&dubbo=2.5.3&export=dubbo%3A%2F%2F192.168.0.34%3A20880%2Forg.spring.springboot.dubbo.CityDubboService%3Fanyhost%3Dtrue%26application%3Dprovider%26dubbo%3D2.5.3%26interface%3Dorg.spring.springboot.dubbo.CityDubboService%26methods%3DfindCityByName%26pid%3D396%26revision%3D1.0.0%26side%3Dprovider%26timestamp%3D1508376581314%26version%3D1.0.0&pid=396&registry=zookeeper&timestamp=1508376581236, cause: java.lang.ClassCastException: org.spring.springboot.dubbo.impl.CityDubboServiceImpl cannot be cast to org.spring.springboot.dubbo.impl.CityDubboServiceImpl
com.alibaba.dubbo.rpc.RpcException: Failed to invoke remote proxy method findCityByName to registry://192.168.2.218:2181/com.alibaba.dubbo.registry.RegistryService?application=provider&dubbo=2.5.3&export=dubbo%3A%2F%2F192.168.0.34%3A20880%2Forg.spring.springboot.dubbo.CityDubboService%3Fanyhost%3Dtrue%26application%3Dprovider%26dubbo%3D2.5.3%26interface%3Dorg.spring.springboot.dubbo.CityDubboService%26methods%3DfindCityByName%26pid%3D396%26revision%3D1.0.0%26side%3Dprovider%26timestamp%3D1508376581314%26version%3D1.0.0&pid=396&registry=zookeeper&timestamp=1508376581236, cause: java.lang.ClassCastException: org.spring.springboot.dubbo.impl.CityDubboServiceImpl cannot be cast to org.spring.springboot.dubbo.impl.CityDubboServiceImpl
   at com.alibaba.dubbo.rpc.proxy.AbstractProxyInvoker.invoke(AbstractProxyInvoker.java:76)
   at com.alibaba.dubbo.rpc.protocol.InvokerWrapper.invoke(InvokerWrapper.java:53)
   at com.alibaba.dubbo.rpc.filter.ExceptionFilter.invoke(ExceptionFilter.java:64)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.rpc.filter.TimeoutFilter.invoke(TimeoutFilter.java:42)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.monitor.support.MonitorFilter.invoke(MonitorFilter.java:75)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.rpc.protocol.dubbo.filter.TraceFilter.invoke(TraceFilter.java:78)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.rpc.filter.ContextFilter.invoke(ContextFilter.java:60)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.rpc.filter.GenericFilter.invoke(GenericFilter.java:112)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.rpc.filter.ClassLoaderFilter.invoke(ClassLoaderFilter.java:38)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.rpc.filter.EchoFilter.invoke(EchoFilter.java:38)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.rpc.protocol.dubbo.DubboProtocol$1.reply(DubboProtocol.java:108)
   at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.handleRequest(HeaderExchangeHandler.java:84)
   at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.received(HeaderExchangeHandler.java:170)
   at com.alibaba.dubbo.remoting.transport.DecodeHandler.received(DecodeHandler.java:52)
   at com.alibaba.dubbo.remoting.transport.dispatcher.ChannelEventRunnable.run(ChannelEventRunnable.java:82)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
   at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.IllegalArgumentException: java.lang.ClassCastException: org.spring.springboot.dubbo.impl.CityDubboServiceImpl cannot be cast to org.spring.springboot.dubbo.impl.CityDubboServiceImpl
   at com.alibaba.dubbo.common.bytecode.Wrapper1.invokeMethod(Wrapper1.java)
   at com.alibaba.dubbo.rpc.proxy.javassist.JavassistProxyFactory$1.doInvoke(JavassistProxyFactory.java:46)
   at com.alibaba.dubbo.rpc.proxy.AbstractProxyInvoker.invoke(AbstractProxyInvoker.java:72)
   ... 25 more
Caused by: java.lang.ClassCastException: org.spring.springboot.dubbo.impl.CityDubboServiceImpl cannot be cast to org.spring.springboot.dubbo.impl.CityDubboServiceImpl
   ... 28 more

   at com.alibaba.dubbo.remoting.exchange.support.DefaultFuture.returnFromResponse(DefaultFuture.java:190)
   at com.alibaba.dubbo.remoting.exchange.support.DefaultFuture.get(DefaultFuture.java:110)
   at com.alibaba.dubbo.remoting.exchange.support.DefaultFuture.get(DefaultFuture.java:84)
   at com.alibaba.dubbo.rpc.protocol.dubbo.DubboInvoker.doInvoke(DubboInvoker.java:96)
   at com.alibaba.dubbo.rpc.protocol.AbstractInvoker.invoke(AbstractInvoker.java:144)
   at com.alibaba.dubbo.rpc.listener.ListenerInvokerWrapper.invoke(ListenerInvokerWrapper.java:74)
   at com.alibaba.dubbo.rpc.protocol.dubbo.filter.FutureFilter.invoke(FutureFilter.java:53)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.monitor.support.MonitorFilter.invoke(MonitorFilter.java:75)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.rpc.filter.ConsumerContextFilter.invoke(ConsumerContextFilter.java:48)
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
   at com.alibaba.dubbo.rpc.protocol.InvokerWrapper.invoke(InvokerWrapper.java:53)
   at com.alibaba.dubbo.rpc.cluster.support.FailoverClusterInvoker.doInvoke(FailoverClusterInvoker.java:77)
   ... 6 more

这种错误一看就知道应该是Server端报的，也就是说通信上面是成功了，但是Server端的序列化和反序列化错误。这个时候就去看Server端的控制台，果然发现了一个错误：

com.alibaba.dubbo.rpc.RpcException: Failed to invoke remote proxy method findCityByName to registry://192.168.2.218:2181/com.alibaba.dubbo.registry.RegistryService?application=provider&dubbo=2.5.3&export=dubbo%3A%2F%2F192.168.0.34%3A20880%2Forg.spring.springboot.dubbo.CityDubboService%3Fanyhost%3Dtrue%26application%3Dprovider%26dubbo%3D2.5.3%26interface%3Dorg.spring.springboot.dubbo.CityDubboService%26methods%3DfindCityByName%26pid%3D396%26revision%3D1.0.0%26side%3Dprovider%26timestamp%3D1508376581314%26version%3D1.0.0&pid=396&registry=zookeeper&timestamp=1508376581236, cause: java.lang.ClassCastException: org.spring.springboot.dubbo.impl.CityDubboServiceImpl cannot be cast to org.spring.springboot.dubbo.impl.CityDubboServiceImpl
   at com.alibaba.dubbo.rpc.proxy.AbstractProxyInvoker.invoke(AbstractProxyInvoker.java:76) ~[dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.rpc.protocol.InvokerWrapper.invoke(InvokerWrapper.java:53) ~[dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.rpc.filter.ExceptionFilter.invoke(ExceptionFilter.java:64) ~[dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) [dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.rpc.filter.TimeoutFilter.invoke(TimeoutFilter.java:42) [dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) [dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.monitor.support.MonitorFilter.invoke(MonitorFilter.java:75) [dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) [dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.rpc.protocol.dubbo.filter.TraceFilter.invoke(TraceFilter.java:78) [dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) [dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.rpc.filter.ContextFilter.invoke(ContextFilter.java:60) [dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) [dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.rpc.filter.GenericFilter.invoke(GenericFilter.java:112) [dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) [dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.rpc.filter.ClassLoaderFilter.invoke(ClassLoaderFilter.java:38) [dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) [dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.rpc.filter.EchoFilter.invoke(EchoFilter.java:38) [dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) [dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.rpc.protocol.dubbo.DubboProtocol$1.reply(DubboProtocol.java:108) [dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.handleRequest(HeaderExchangeHandler.java:84) [dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.received(HeaderExchangeHandler.java:170) [dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.remoting.transport.DecodeHandler.received(DecodeHandler.java:52) [dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.remoting.transport.dispatcher.ChannelEventRunnable.run(ChannelEventRunnable.java:82) [dubbo-2.5.3.jar:2.5.3]
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_15]
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_15]
   at java.lang.Thread.run(Thread.java:722) [na:1.7.0_15]
Caused by: java.lang.IllegalArgumentException: java.lang.ClassCastException: org.spring.springboot.dubbo.impl.CityDubboServiceImpl cannot be cast to org.spring.springboot.dubbo.impl.CityDubboServiceImpl
   at com.alibaba.dubbo.common.bytecode.Wrapper1.invokeMethod(Wrapper1.java) ~[na:2.5.3]
   at com.alibaba.dubbo.rpc.proxy.javassist.JavassistProxyFactory$1.doInvoke(JavassistProxyFactory.java:46) ~[dubbo-2.5.3.jar:2.5.3]
   at com.alibaba.dubbo.rpc.proxy.AbstractProxyInvoker.invoke(AbstractProxyInvoker.java:72) ~[dubbo-2.5.3.jar:2.5.3]
   ... 25 common frames omitted
Caused by: java.lang.ClassCastException: org.spring.springboot.dubbo.impl.CityDubboServiceImpl cannot be cast to org.spring.springboot.dubbo.impl.CityDubboServiceImpl
   ... 28 common frames omitted

2017-10-19 09:37:55.998 ERROR 396 --- [:20880-thread-6] c.a.dubbo.rpc.filter.ExceptionFilter : [DUBBO] Got unchecked and undeclared exception which called by 192.168.0.34. service: org.spring.springboot.dubbo.CityDubboService, method: findCityByName, exception: com.alibaba.dubbo.rpc.RpcException: Failed to invoke remote proxy method findCityByName to registry://192.168.2.218:2181/com.alibaba.dubbo.registry.RegistryService?application=provider&dubbo=2.5.3&export=dubbo%3A%2F%2F192.168.0.34%3A20880%2Forg.spring.springboot.dubbo.CityDubboService%3Fanyhost%3Dtrue%26application%3Dprovider%26dubbo%3D2.5.3%26interface%3Dorg.spring.springboot.dubbo.CityDubboService%26methods%3DfindCityByName%26pid%3D396%26revision%3D1.0.0%26side%3Dprovider%26timestamp%3D1508376581314%26version%3D1.0.0&pid=396&registry=zookeeper&timestamp=1508376581236, cause: java.lang.ClassCastException: org.spring.springboot.dubbo.impl.CityDubboServiceImpl cannot be cast to org.spring.springboot.dubbo.impl.CityDubboServiceImpl, dubbo version: 2.5.3, current host: 127.0.0.1

2017-10-19 09:37:56.005 ERROR 396 --- [:20880-thread-7] c.a.dubbo.rpc.filter.ExceptionFilter : [DUBBO] Got unchecked and undeclared exception which called by 192.168.0.34. service: org.spring.springboot.dubbo.CityDubboService, method: findCityByName, exception: com.alibaba.dubbo.rpc.RpcException: Failed to invoke remote proxy method findCityByName to registry://192.168.2.218:2181/com.alibaba.dubbo.registry.RegistryService?application=provider&dubbo=2.5.3&export=dubbo%3A%2F%2F192.168.0.34%3A20880%2Forg.spring.springboot.dubbo.CityDubboService%3Fanyhost%3Dtrue%26application%3Dprovider%26dubbo%3D2.5.3%26interface%3Dorg.spring.springboot.dubbo.CityDubboService%26methods%3DfindCityByName%26pid%3D396%26revision%3D1.0.0%26side%3Dprovider%26timestamp%3D1508376581314%26version%3D1.0.0&pid=396&registry=zookeeper&timestamp=1508376581236, cause: java.lang.ClassCastException: org.spring.springboot.dubbo.impl.CityDubboServiceImpl cannot be cast to org.spring.springboot.dubbo.impl.CityDubboServiceImpl, dubbo version: 2.5.3, current host: 127.0.0.1

这个问题比较诡异，我也是百思不得其解。因为Caused by: java.lang.ClassCastException这种异常不应该产生才对，为啥会产生呢？我想过包冲突，这个是最大的可能性。但是仔细检查了一下maven发现都是很正常的，也查看了Eclipse的编译器，都是正常的。这个时候，我尝试去掉Server里面的spring-boot-devtools

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>

再一次启动，发现居然成功了。。。

那么问题来了，为啥集成spring-boot-devtools会报错呢？这不应该，不科学，也难以定位。像我就在这个问题上足足浪费了差不多一天的时间。要解决这种问题，又没啥资料，那就只有一个方法——源代码走查。

我通过走查springboot-devtools的源码发现，这玩意儿自带classLoader，而且还是两个。与springboot整合的时候会导致加载顺序上出问题，导致程序无法正常去启动加载类。但是我们做开发的时候又不得不使用热部署，毕竟为了提高效率减少反复的部署。这里提供一个方案，采用Spring提供的springloaded。

如何使用springloaded可以参考这篇文章：
http://www.cnblogs.com/magicalSam/p/7196355.html

转载于:https://my.oschina.net/u/158474/blog/1553167

dubbo+springboot整合异常

相关推荐