dubbo 服务正常注册和消费，但调用dubbo 服务时报错。错误信息如下：
org.apache.dubbo.rpc.RpcException: Failed to invoke the method checkUser in the service cn.xxx.xcc.biz.service.rpc.service.PermissionService. Tried 3 times of the providers [10.5.12.13:20881] (1/1) from the registry 10.5.12.13:2181 on the consumer 10.57.240.33 using the dubbo version 2.7.7. Last error is: Failed to invoke remote method: checkUser, provider: dubbo://10.5.12.13:20881/cn.xxx.xcc.biz.service.rpc.service.PermissionService?anyhost=true&application=xcc-app&check=false&deprecated=false&dubbo=2.0.2&dynamic=true&generic=false&init=false&interface=cn.xxx.xcc.biz.service.rpc.service.PermissionService&metadata-type=remote&methods=checkUser&pid=18337&qos.enable=false®ister.ip=10.57.240.33&release=2.7.9&remote.application=xcc-app&revision=2.5.0-RELEASE&side=consumer&sticky=false×tamp=1655531703798&version=v3-dev, cause: org.apache.dubbo.remoting.RemotingException: io.netty.handler.codec.EncoderException: java.lang.NullPointerException
io.netty.handler.codec.EncoderException: java.lang.NullPointerException
at
组内有几个小伙伴，本地开发，调用dubbo服务，有一位同学调用报错。其他人都没报错。
经过差异化对比，报错的同学因为比别人多集成了一个别人提供的组件。
从zk上抓取dubbo 服务注册和消费信息来看，最终找到蛛丝马迹。报错的同学就是：10.57.240.33 这个消费者，他用的dubbo版本是release=2.7.7，别人用的都是dubbo=2.8.4。于是乎去分析代码的maven依赖，果然，新引进来的二方包，依赖了dubbo2.7.7.排除掉该2.7.7低版本。就可以正常注册消费调用了。
consumer://10.57.240.33/cn.xxx.xcc.biz.service.rpc.service.PermissionService?application=xinghuo&category=consumers&check=false&dubbo=2.0.2&init=false&interface=cn.xxx.xcc.biz.service.rpc.service.PermissionService&methods=checkUser&pid=18337&qos.enable=false&release=2.7.7&revision=2.5.0-RELEASE&side=consumer&sticky=false×tamp=1655540848540&version=v3-dev
consumer://10.57.240.216/cn.xxx.xcc.biz.service.rpc.service.PermissionService?application=xinghuo&category=consumers&check=false&dubbo=2.8.4&interface=cn.xxx.xcc.biz.service.rpc.service.PermissionService&methods=checkUser&pid=9944&revision=2.5.0-RELEASE&side=consumer&timeout=2000×tamp=1655541217245&version=v3-dev
consumer://10.57.240.216/cn.xxx.xcc.biz.service.rpc.service.PermissionService?application=xinghuo&category=consumers&check=false&dubbo=2.8.4&interface=cn.xxx.xcc.biz.service.rpc.service.PermissionService&methods=checkUser&pid=9944&revision=2.5.0-RELEASE&side=consumer&timeout=2000×tamp=1655541217690&version=v3-dev
consumer://10.57.240.39/cn.xxx.xcc.biz.service.rpc.service.PermissionService?application=xinghuo&category=consumers&check=false&dubbo=2.8.4&interface=cn.xxx.xcc.biz.service.rpc.service.PermissionService&methods=checkUser&pid=5781&revision=2.5.0-RELEASE&side=consumer&timeout=2000×tamp=1655538643525&version=v3-dev
org.apache.dubbo.rpc.RpcException: Failed to invoke the method checkUser in the service cn.xxx.xcc.biz.service.rpc.service.PermissionService. Tried 3 times of the providers [10.5.12.13:20881] (1/1) from the registry 10.5.12.13:2181 on the consumer 10.57.240.33 using the dubbo version 2.7.7. Last error is: Failed to invoke remote method: checkUser, provider: dubbo://10.5.12.13:20881/cn.xxx.xcc.biz.service.rpc.service.PermissionService?anyhost=true&application=xcc-app&check=false&deprecated=false&dubbo=2.0.2&dynamic=true&generic=false&init=false&interface=cn.xxx.xcc.biz.service.rpc.service.PermissionService&metadata-type=remote&methods=checkUser&pid=18337&qos.enable=false®ister.ip=10.57.240.33&release=2.7.9&remote.application=xcc-app&revision=2.5.0-RELEASE&side=consumer&sticky=false×tamp=1655531703798&version=v3-dev, cause: org.apache.dubbo.remoting.RemotingException: io.netty.handler.codec.EncoderException: java.lang.NullPointerException
io.netty.handler.codec.EncoderException: java.lang.NullPointerException
at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:125)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:716)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:708)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:791)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:701)
at io.netty.handler.timeout.IdleStateHandler.write(IdleStateHandler.java:305)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:716)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:708)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:791)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:701)
at io.netty.channel.ChannelDuplexHandler.write(ChannelDuplexHandler.java:115)
at org.apache.dubbo.remoting.transport.netty4.NettyClientHandler.write(NettyClientHandler.java:88)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:716)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:708)
at io.netty.channel.AbstractChannelHandlerContext.access
1700
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1700(AbstractChannelHandlerContext.java:56) at io.netty.channel.AbstractChannelHandlerContext
1700(AbstractChannelHandlerContext.java:56)atio.netty.channel.AbstractChannelHandlerContextAbstractWriteTask.write(AbstractChannelHandlerContext.java:1102)
at io.netty.channel.AbstractChannelHandlerContext
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WriteAndFlushTask.write(AbstractChannelHandlerContext.java:1149) at io.netty.channel.AbstractChannelHandlerContext
WriteAndFlushTask.write(AbstractChannelHandlerContext.java:1149)atio.netty.channel.AbstractChannelHandlerContextAbstractWriteTask.run(AbstractChannelHandlerContext.java:1073)
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute$$$capture(AbstractEventExecutor.java:163)
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:405)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:500)
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:906)
at io.netty.util.internal.ThreadExecutorMap
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2.run(ThreadExecutorMap.java:74) at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) at java.lang.Thread.run(Thread.java:748) Caused by: java.lang.NullPointerException at com.alibaba.com.caucho.hessian.io.Hessian2Output.flushBuffer(Hessian2Output.java:1491) at org.apache.dubbo.common.serialize.hessian2.Hessian2ObjectOutput.flushBuffer(Hessian2ObjectOutput.java:102) at org.apache.dubbo.remoting.exchange.codec.ExchangeCodec.encodeRequest(ExchangeCodec.java:240) at org.apache.dubbo.remoting.exchange.codec.ExchangeCodec.encode(ExchangeCodec.java:69) at org.apache.dubbo.rpc.protocol.dubbo.DubboCountCodec.encode(DubboCountCodec.java:40) at org.apache.dubbo.remoting.transport.netty4.NettyCodecAdapter
2.run(ThreadExecutorMap.java:74)atio.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)atjava.lang.Thread.run(Thread.java:748)Causedby:java.lang.NullPointerExceptionatcom.alibaba.com.caucho.hessian.io.Hessian2Output.flushBuffer(Hessian2Output.java:1491)atorg.apache.dubbo.common.serialize.hessian2.Hessian2ObjectOutput.flushBuffer(Hessian2ObjectOutput.java:102)atorg.apache.dubbo.remoting.exchange.codec.ExchangeCodec.encodeRequest(ExchangeCodec.java:240)atorg.apache.dubbo.remoting.exchange.codec.ExchangeCodec.encode(ExchangeCodec.java:69)atorg.apache.dubbo.rpc.protocol.dubbo.DubboCountCodec.encode(DubboCountCodec.java:40)atorg.apache.dubbo.remoting.transport.netty4.NettyCodecAdapterInternalEncoder.encode(NettyCodecAdapter.java:69)
at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:107)
… 25 more
at org.apache.dubbo.rpc.cluster.support.FailoverClusterInvoker.doInvoke(FailoverClusterInvoker.java:113)
at org.apache.dubbo.rpc.cluster.support.AbstractClusterInvoker.invoke(AbstractClusterInvoker.java:259)
at org.apache.dubbo.rpc.cluster.interceptor.ClusterInterceptor.intercept(ClusterInterceptor.java:47)
at org.apache.dubbo.rpc.cluster.support.wrapper.AbstractCluster$InterceptorInvokerNode.invoke(AbstractCluster.java:92)
at org.apache.dubbo.rpc.cluster.support.wrapper.MockClusterInvoker.invoke(MockClusterInvoker.java:82)
at org.apache.dubbo.rpc.proxy.InvokerInvocationHandler.invoke(InvokerInvocationHandler.java:74)
at org.apache.dubbo.common.bytecode.proxy3.checkUser(proxy3.java)
at cn.tongdun.paas.dm.datamanager.filter.HttpBaseInterceptor.preHandle(HttpBaseInterceptor.java:42)
at org.springframework.web.servlet.HandlerExecutionChain.applyPreHandle(HandlerExecutionChain.java:136)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:986)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:870)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:855)
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.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:158)
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:126)
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:111)
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.boot.actuate.web.trace.servlet.HttpTraceFilter.doFilterInternal(HttpTraceFilter.java:84)
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 cn.tongdun.yuntu.common.auth.biz.resolver.RequestWrapperFilter.doFilter(RequestWrapperFilter.java:41)
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:81)
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:199)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)
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.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)
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: java.util.concurrent.ExecutionException: org.apache.dubbo.remoting.RemotingException: io.netty.handler.codec.EncoderException: java.lang.NullPointerException
io.netty.handler.codec.EncoderException: java.lang.NullPointerException
at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:125)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:716)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:708)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:791)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:701)
at io.netty.handler.timeout.IdleStateHandler.write(IdleStateHandler.java:305)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:716)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:708)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:791)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:701)
at io.netty.channel.ChannelDuplexHandler.write(ChannelDuplexHandler.java:115)
at org.apache.dubbo.remoting.transport.netty4.NettyClientHandler.write(NettyClientHandler.java:88)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:716)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:708)
at io.netty.channel.AbstractChannelHandlerContext.access
1700
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1700(AbstractChannelHandlerContext.java:56)atio.netty.channel.AbstractChannelHandlerContextAbstractWriteTask.write(AbstractChannelHandlerContext.java:1102)
at io.netty.channel.AbstractChannelHandlerContext
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WriteAndFlushTask.write(AbstractChannelHandlerContext.java:1149)atio.netty.channel.AbstractChannelHandlerContextAbstractWriteTask.run(AbstractChannelHandlerContext.java:1073)
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2.run(ThreadExecutorMap.java:74) at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) at java.lang.Thread.run(Thread.java:748) Caused by: java.lang.NullPointerException at com.alibaba.com.caucho.hessian.io.Hessian2Output.flushBuffer(Hessian2Output.java:1491) at org.apache.dubbo.common.serialize.hessian2.Hessian2ObjectOutput.flushBuffer(Hessian2ObjectOutput.java:102) at org.apache.dubbo.remoting.exchange.codec.ExchangeCodec.encodeRequest(ExchangeCodec.java:240) at org.apache.dubbo.remoting.exchange.codec.ExchangeCodec.encode(ExchangeCodec.java:69) at org.apache.dubbo.rpc.protocol.dubbo.DubboCountCodec.encode(DubboCountCodec.java:40) at org.apache.dubbo.remoting.transport.netty4.NettyCodecAdapter
2.run(ThreadExecutorMap.java:74)atio.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)atjava.lang.Thread.run(Thread.java:748)Causedby:java.lang.NullPointerExceptionatcom.alibaba.com.caucho.hessian.io.Hessian2Output.flushBuffer(Hessian2Output.java:1491)atorg.apache.dubbo.common.serialize.hessian2.Hessian2ObjectOutput.flushBuffer(Hessian2ObjectOutput.java:102)atorg.apache.dubbo.remoting.exchange.codec.ExchangeCodec.encodeRequest(ExchangeCodec.java:240)atorg.apache.dubbo.remoting.exchange.codec.ExchangeCodec.encode(ExchangeCodec.java:69)atorg.apache.dubbo.rpc.protocol.dubbo.DubboCountCodec.encode(DubboCountCodec.java:40)atorg.apache.dubbo.remoting.transport.netty4.NettyCodecAdapterInternalEncoder.encode(NettyCodecAdapter.java:69)
at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:107)
… 25 more
at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357)
at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1915)
at org.apache.dubbo.rpc.AsyncRpcResult.get(AsyncRpcResult.java:181)
at org.apache.dubbo.rpc.protocol.AsyncToSyncInvoker.invoke(AsyncToSyncInvoker.java:61)
at org.apache.dubbo.monitor.support.MonitorFilter.invoke(MonitorFilter.java:89)
at org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:81)
at org.apache.dubbo.rpc.protocol.dubbo.filter.FutureFilter.invoke(FutureFilter.java:51)
at org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:81)
at org.apache.dubbo.rpc.filter.ConsumerContextFilter.invoke(ConsumerContextFilter.java:69)
at org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:81)
at org.apache.dubbo.rpc.listener.ListenerInvokerWrapper.invoke(ListenerInvokerWrapper.java:78)
at org.apache.dubbo.rpc.protocol.InvokerWrapper.invoke(InvokerWrapper.java:56)
at org.apache.dubbo.rpc.cluster.support.FailoverClusterInvoker.doInvoke(FailoverClusterInvoker.java:82)
... 66 common frames omitted