大家好，我是烤鸭：

   dubbo遇到如下问题。

 

 1.   异常详细信息：

   某个异常对象无法实例化。

com.alibaba.dubbo.rpc.RpcException: Failed to invoke remote method: updateCardBycustomerNum, provider: dubbo://20.x.xx.48:20883/com.etc.service.bank.EtcBankcardInfoService?anyhost=true&application=etc_manage_web&check=false&default.timeout=600000&dubbo=2.6.2&generic=false&interface=com.etc.service.bank.EtcBankcardInfoService&methods=protocolBindCardSupplement,queryAlipayBinds,update,insert,updateCardBycustomerNum,bindAlipay,getUserByCustomerNum,selectListByObject,validateBindCard,updateDefault,selectBycustomerNum,validateBindCardSupplement,protocolBindCard,selectOneByObject,selectBycustomerNumBackend&pid=2539&register.ip=10.xx.xx.47&remote.timestamp=1561084612315&revision=1.0-SNAPSHOT&side=consumer&timestamp=1561101150616, cause: com.alibaba.com.caucho.hessian.io.HessianFieldException: org.apache.http.conn.HttpHostConnectException.host: 'org.apache.http.HttpHost' could not be instantiated
com.alibaba.com.caucho.hessian.io.HessianFieldException: org.apache.http.conn.HttpHostConnectException.host: 'org.apache.http.HttpHost' could not be instantiatedat com.alibaba.com.caucho.hessian.io.JavaDeserializer.logDeserializeError(JavaDeserializer.java:167)at com.alibaba.com.caucho.hessian.io.JavaDeserializer$ObjectFieldDeserializer.deserialize(JavaDeserializer.java:412)at com.alibaba.com.caucho.hessian.io.JavaDeserializer.readObject(JavaDeserializer.java:276)at com.alibaba.com.caucho.hessian.io.JavaDeserializer.readObject(JavaDeserializer.java:203)at com.alibaba.com.caucho.hessian.io.SerializerFactory.readObject(SerializerFactory.java:526)at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObjectInstance(Hessian2Input.java:2810)at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2750)at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2279)at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2724)at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2279)at com.alibaba.dubbo.common.serialize.hessian2.Hessian2ObjectInput.readObject(Hessian2ObjectInput.java:84)at com.alibaba.dubbo.rpc.protocol.dubbo.DecodeableRpcResult.decode(DecodeableRpcResult.java:92)at com.alibaba.dubbo.rpc.protocol.dubbo.DecodeableRpcResult.decode(DecodeableRpcResult.java:113)at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCodec.decodeBody(DubboCodec.java:89)at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.decode(ExchangeCodec.java:124)at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.decode(ExchangeCodec.java:84)at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCountCodec.decode(DubboCountCodec.java:46)at com.alibaba.dubbo.remoting.transport.netty.NettyCodecAdapter$InternalDecoder.messageReceived(NettyCodecAdapter.java:133)at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:80)at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559)at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:274)at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:261)at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:349)at org.jboss.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:280)at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:200)at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:44)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)at java.lang.Thread.run(Thread.java:748)
Caused by: com.alibaba.com.caucho.hessian.io.HessianProtocolException: 'org.apache.http.HttpHost' could not be instantiatedat com.alibaba.com.caucho.hessian.io.JavaDeserializer.instantiate(JavaDeserializer.java:316)at com.alibaba.com.caucho.hessian.io.JavaDeserializer.readObject(JavaDeserializer.java:201)at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObjectInstance(Hessian2Input.java:2808)at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2146)at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2075)at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2119)at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2075)at com.alibaba.com.caucho.hessian.io.JavaDeserializer$ObjectFieldDeserializer.deserialize(JavaDeserializer.java:408)... 29 more
Caused by: java.lang.reflect.InvocationTargetExceptionat sun.reflect.GeneratedConstructorAccessor90.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at com.alibaba.com.caucho.hessian.io.JavaDeserializer.instantiate(JavaDeserializer.java:312)... 36 more
Caused by: java.lang.IllegalArgumentException: Host name may not be nullat org.apache.http.util.Args.containsNoBlanks(Args.java:81)at org.apache.http.HttpHost.<init>(HttpHost.java:80)at org.apache.http.HttpHost.<init>(HttpHost.java:135)... 40 moreat com.alibaba.dubbo.rpc.protocol.dubbo.DubboInvoker.doInvoke(DubboInvoker.java:100)at com.alibaba.dubbo.rpc.protocol.AbstractInvoker.invoke(AbstractInvoker.java:148)at com.alibaba.dubbo.monitor.support.MonitorFilter.invoke(MonitorFilter.java:75)at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:72)at com.alibaba.dubbo.rpc.protocol.dubbo.filter.FutureFilter.invoke(FutureFilter.java:54)at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:72)at com.alibaba.dubbo.rpc.filter.ConsumerContextFilter.invoke(ConsumerContextFilter.java:48)at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:72)at com.alibaba.dubbo.rpc.listener.ListenerInvokerWrapper.invoke(ListenerInvokerWrapper.java:77)at com.alibaba.dubbo.rpc.protocol.InvokerWrapper.invoke(InvokerWrapper.java:56)at com.alibaba.dubbo.rpc.cluster.support.FailoverClusterInvoker.doInvoke(FailoverClusterInvoker.java:78)at com.alibaba.dubbo.rpc.cluster.support.AbstractClusterInvoker.invoke(AbstractClusterInvoker.java:238)at com.alibaba.dubbo.rpc.cluster.support.wrapper.MockClusterInvoker.invoke(MockClusterInvoker.java:75)at com.alibaba.dubbo.rpc.proxy.InvokerInvocationHandler.invoke(InvokerInvocationHandler.java:52)at com.alibaba.dubbo.common.bytecode.proxy5.updateCardBycustomerNum(proxy5.java)at com.etc.controller.bank.EtcBankcardInfoController.findUserCard(EtcBankcardInfoController.java:334)at sun.reflect.GeneratedMethodAccessor301.invoke(Unknown Source)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at com.etc.controller.util.InvokeController.invoke(InvokeController.java:88)at sun.reflect.GeneratedMethodAccessor197.invoke(Unknown Source)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209)at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:891)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797)at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974)at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:877)at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851)at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61)at com.etc.filter.CookieFilter.doFilter(CookieFilter.java:30)at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:96)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800)at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Thread.java:748)
Caused by: com.alibaba.dubbo.remoting.RemotingException: com.alibaba.com.caucho.hessian.io.HessianFieldException: org.apache.http.conn.HttpHostConnectException.host: 'org.apache.http.HttpHost' could not be instantiated
com.alibaba.com.caucho.hessian.io.HessianFieldException: org.apache.http.conn.HttpHostConnectException.host: 'org.apache.http.HttpHost' could not be instantiatedat com.alibaba.com.caucho.hessian.io.JavaDeserializer.logDeserializeError(JavaDeserializer.java:167)at com.alibaba.com.caucho.hessian.io.JavaDeserializer$ObjectFieldDeserializer.deserialize(JavaDeserializer.java:412)at com.alibaba.com.caucho.hessian.io.JavaDeserializer.readObject(JavaDeserializer.java:276)at com.alibaba.com.caucho.hessian.io.JavaDeserializer.readObject(JavaDeserializer.java:203)at com.alibaba.com.caucho.hessian.io.SerializerFactory.readObject(SerializerFactory.java:526)at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObjectInstance(Hessian2Input.java:2810)at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2750)at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2279)at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2724)at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2279)at com.alibaba.dubbo.common.serialize.hessian2.Hessian2ObjectInput.readObject(Hessian2ObjectInput.java:84)at com.alibaba.dubbo.rpc.protocol.dubbo.DecodeableRpcResult.decode(DecodeableRpcResult.java:92)at com.alibaba.dubbo.rpc.protocol.dubbo.DecodeableRpcResult.decode(DecodeableRpcResult.java:113)at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCodec.decodeBody(DubboCodec.java:89)at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.decode(ExchangeCodec.java:124)at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.decode(ExchangeCodec.java:84)at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCountCodec.decode(DubboCountCodec.java:46)at com.alibaba.dubbo.remoting.transport.netty.NettyCodecAdapter$InternalDecoder.messageReceived(NettyCodecAdapter.java:133)at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:80)at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559)at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:274)at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:261)at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:349)at org.jboss.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:280)at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:200)at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:44)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)at java.lang.Thread.run(Thread.java:748)
Caused by: com.alibaba.com.caucho.hessian.io.HessianProtocolException: 'org.apache.http.HttpHost' could not be instantiatedat com.alibaba.com.caucho.hessian.io.JavaDeserializer.instantiate(JavaDeserializer.java:316)at com.alibaba.com.caucho.hessian.io.JavaDeserializer.readObject(JavaDeserializer.java:201)at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObjectInstance(Hessian2Input.java:2808)at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2146)at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2075)at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2119)at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2075)at com.alibaba.com.caucho.hessian.io.JavaDeserializer$ObjectFieldDeserializer.deserialize(JavaDeserializer.java:408)... 29 more
Caused by: java.lang.reflect.InvocationTargetExceptionat sun.reflect.GeneratedConstructorAccessor90.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at com.alibaba.com.caucho.hessian.io.JavaDeserializer.instantiate(JavaDeserializer.java:312)... 36 more
Caused by: java.lang.IllegalArgumentException: Host name may not be nullat org.apache.http.util.Args.containsNoBlanks(Args.java:81)at org.apache.http.HttpHost.<init>(HttpHost.java:80)at org.apache.http.HttpHost.<init>(HttpHost.java:135)... 40 moreat com.alibaba.dubbo.remoting.exchange.support.DefaultFuture.returnFromResponse(DefaultFuture.java:222)at com.alibaba.dubbo.remoting.exchange.support.DefaultFuture.get(DefaultFuture.java:139)at com.alibaba.dubbo.remoting.exchange.support.DefaultFuture.get(DefaultFuture.java:112)at com.alibaba.dubbo.rpc.protocol.dubbo.DubboInvoker.doInvoke(DubboInvoker.java:95)... 88 more

2.   原因猜想

      猜测可能是内网调用，没有配置hostname 导致的。

     1. 查看机器名

hostname

     2.修改hosts文件 ,如果前面机器名已被映射我们就将其注释掉

vi /etc/hosts
ip hostname
#比如 hostname 为 aaa,ip 为 11.22.33.123
11.22.33.123 aaa

     3. 刷新hosts文件  

source /etc/hosts  

      4.重启网卡

 systemctl restart network   

3.   问题分析

后来又仔细检查一遍日志发现一个问题。我们是采用多个提供者的模式，可能相同的消费者指向了不同的提供者。其实多个提供者也不会有这个问题，分别去 47 和 48 服务器看了，发现两个服务器的 jar包大小不一样，说明两个包的版本不一致。

这次出现的问题就是这样了。具体的原因还没有查，如果有类似的问题，可以参考下我这个场景。

如果是自定义的包或者类，可能是没有默认的构造器之类的问题，加上就好了。