一、异常出现的场景
某一天下午，测试突然跑过来说，IOS系统APP访问500，Android没问题。我的第一反应是那就奇怪了，调的接口都是一样的，莫非和系统有关系。而且这个错误重启服务后，过一段时间才能出现。
通过抓接口，接口的请求参数和请求头也都没问题。
异常信息如下:
2019-03-06 11:12:38.930 [redisson-netty-1-6] ERROR org.redisson.client.handler.CommandDecoder - Unable to decode data. channel: [id: 0x6f473218, L:/192.168.208.2:58514 - R:r-2ze8071a7aae12f4.redis.rds.aliyuncs.com/172.17.189.108:6379] message: *8 $10 "merchant" $14220 $22 "session:creationTime" $32 ["java.lang.Long",1551841392125] $26 "session:lastAccessedTime" $32 ["java.lang.Long",1551841957642] $29 "session:maxInactiveInterval" $23 ["java.lang.Long",1800] com.fasterxml.jackson.databind.exc.InvalidTypeIdException: Could not resolve type id 'com.sku.common.model.JavaMerchant' as a subtype of [simple type, class java.lang.Object]: no such class found at [Source: (io.netty.buffer.ByteBufInputStream); line: 1, column: 11] at com.fasterxml.jackson.databind.exc.InvalidTypeIdException.from(InvalidTypeIdException.java:43) at com.fasterxml.jackson.databind.DeserializationContext.invalidTypeIdException(DeserializationContext.java:1628) at com.fasterxml.jackson.databind.DeserializationContext.handleUnknownTypeId(DeserializationContext.java:1186) at com.fasterxml.jackson.databind.jsontype.impl.ClassNameIdResolver._typeFromId(ClassNameIdResolver.java:53) at com.fasterxml.jackson.databind.jsontype.impl.ClassNameIdResolver.typeFromId(ClassNameIdResolver.java:44) at com.fasterxml.jackson.databind.jsontype.impl.TypeDeserializerBase._findDeserializer(TypeDeserializerBase.java:156) at com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer._deserializeTypedForId(AsPropertyTypeDeserializer.java:113) at com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer.deserializeTypedFromObject(AsPropertyTypeDeserializer.java:97) at com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer.deserializeTypedFromAny(AsPropertyTypeDeserializer.java:193) at com.fasterxml.jackson.databind.deser.std.UntypedObjectDeserializer$Vanilla.deserializeWithType(UntypedObjectDeserializer.java:712) at com.fasterxml.jackson.databind.deser.impl.TypeWrappedDeserializer.deserialize(TypeWrappedDeserializer.java:68) at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4013) at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3070) at org.redisson.codec.JsonJacksonCodec$2.decode(JsonJacksonCodec.java:92) at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:345) at org.redisson.client.handler.CommandDecoder.decodeList(CommandDecoder.java:406) at org.redisson.client.handler.CommandDecoder.decodeFromCheckpoint(CommandDecoder.java:196) at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:122) at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:489) at io.netty.handler.codec.ReplayingDecoder.callDecode(ReplayingDecoder.java:366) at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:265) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965) at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:647) at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:582) at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:499) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:461) at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884) at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) at java.lang.Thread.run(Thread.java:748) 2019-03-06 11:12:38.931 [redisson-netty-1-6] WARN io.netty.channel.DefaultChannelPipeline - An exceptionCaught() event was fired, and it reached at the tail of the pipeline. It usually means the last handler in the pipeline did not handle the exception. io.netty.handler.codec.DecoderException: com.fasterxml.jackson.databind.exc.InvalidTypeIdException: Could not resolve type id 'com.sku.common.model.JavaMerchant' as a subtype of [simple type, class java.lang.Object]: no such class found at [Source: (io.netty.buffer.ByteBufInputStream); line: 1, column: 11] at io.netty.handler.codec.ReplayingDecoder.callDecode(ReplayingDecoder.java:421) at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:265) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965) at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:647) at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:582) at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:499) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:461) at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884) at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) at java.lang.Thread.run(Thread.java:748) Caused by: com.fasterxml.jackson.databind.exc.InvalidTypeIdException: Could not resolve type id 'com.sku.common.model.JavaMerchant' as a subtype of [simple type, class java.lang.Object]: no such class found at [Source: (io.netty.buffer.ByteBufInputStream); line: 1, column: 11] at com.fasterxml.jackson.databind.exc.InvalidTypeIdException.from(InvalidTypeIdException.java:43) at com.fasterxml.jackson.databind.DeserializationContext.invalidTypeIdException(DeserializationContext.java:1628) at com.fasterxml.jackson.databind.DeserializationContext.handleUnknownTypeId(DeserializationContext.java:1186) at com.fasterxml.jackson.databind.jsontype.impl.ClassNameIdResolver._typeFromId(ClassNameIdResolver.java:53) at com.fasterxml.jackson.databind.jsontype.impl.ClassNameIdResolver.typeFromId(ClassNameIdResolver.java:44) at com.fasterxml.jackson.databind.jsontype.impl.TypeDeserializerBase._findDeserializer(TypeDeserializerBase.java:156) at com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer._deserializeTypedForId(AsPropertyTypeDeserializer.java:113) at com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer.deserializeTypedFromObject(AsPropertyTypeDeserializer.java:97) at com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer.deserializeTypedFromAny(AsPropertyTypeDeserializer.java:193) at com.fasterxml.jackson.databind.deser.std.UntypedObjectDeserializer$Vanilla.deserializeWithType(UntypedObjectDeserializer.java:712) at com.fasterxml.jackson.databind.deser.impl.TypeWrappedDeserializer.deserialize(TypeWrappedDeserializer.java:68) at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4013) at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3070) at org.redisson.codec.JsonJacksonCodec$2.decode(JsonJacksonCodec.java:92) at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:345) at org.redisson.client.handler.CommandDecoder.decodeList(CommandDecoder.java:406) at org.redisson.client.handler.CommandDecoder.decodeFromCheckpoint(CommandDecoder.java:196) at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:122) at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:489) at io.netty.handler.codec.ReplayingDecoder.callDecode(ReplayingDecoder.java:366) ... 28 common frames omitted 2019-03-06 11:12:38.932 [http-nio-9850-exec-3] ERROR o.a.c.c.C.[.[localhost].[/].[dispatcherServlet] - Servlet.service() for servlet [dispatcherServlet] threw exception org.redisson.client.RedisException: Unexpected exception while processing command at org.redisson.command.CommandAsyncService.convertException(CommandAsyncService.java:343) at org.redisson.command.CommandAsyncService.get(CommandAsyncService.java:170) at org.redisson.RedissonObject.get(RedissonObject.java:74) at org.redisson.RedissonMap.readAllEntrySet(RedissonMap.java:426) at org.redisson.spring.session.RedissonSessionRepository$RedissonSession.load(RedissonSessionRepository.java:96) at org.redisson.spring.session.RedissonSessionRepository.findById(RedissonSessionRepository.java:310) at org.redisson.spring.session.RedissonSessionRepository.findById(RedissonSessionRepository.java:52) at org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.getRequestedSession(SessionRepositoryFilter.java:364) at org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.getSession(SessionRepositoryFilter.java:301) at org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.getSession(SessionRepositoryFilter.java:197) at org.springframework.web.util.WebUtils.getSessionId(WebUtils.java:287) at org.springframework.web.servlet.FrameworkServlet.publishRequestHandledEvent(FrameworkServlet.java:1078) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) 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.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal(SessionRepositoryFilter.java:147) at org.springframework.session.web.http.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:81) 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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:728) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:472) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:395) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:316) at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:395) at org.apache.catalina.core.StandardHostValve.status(StandardHostValve.java:254) at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:349) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:175) 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: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$SocketProcessor.doRun(NioEndpoint.java:1468) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:748) Caused by: com.fasterxml.jackson.databind.exc.InvalidTypeIdException: Could not resolve type id 'com.sku.common.model.JavaMerchant' as a subtype of [simple type, class java.lang.Object]: no such class found at [Source: (io.netty.buffer.ByteBufInputStream); line: 1, column: 11] at com.fasterxml.jackson.databind.exc.InvalidTypeIdException.from(InvalidTypeIdException.java:43) at com.fasterxml.jackson.databind.DeserializationContext.invalidTypeIdException(DeserializationContext.java:1628) at com.fasterxml.jackson.databind.DeserializationContext.handleUnknownTypeId(DeserializationContext.java:1186) at com.fasterxml.jackson.databind.jsontype.impl.ClassNameIdResolver._typeFromId(ClassNameIdResolver.java:53) at com.fasterxml.jackson.databind.jsontype.impl.ClassNameIdResolver.typeFromId(ClassNameIdResolver.java:44) at com.fasterxml.jackson.databind.jsontype.impl.TypeDeserializerBase._findDeserializer(TypeDeserializerBase.java:156) at com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer._deserializeTypedForId(AsPropertyTypeDeserializer.java:113) at com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer.deserializeTypedFromObject(AsPropertyTypeDeserializer.java:97) at com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer.deserializeTypedFromAny(AsPropertyTypeDeserializer.java:193) at com.fasterxml.jackson.databind.deser.std.UntypedObjectDeserializer$Vanilla.deserializeWithType(UntypedObjectDeserializer.java:712) at com.fasterxml.jackson.databind.deser.impl.TypeWrappedDeserializer.deserialize(TypeWrappedDeserializer.java:68) at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4013) at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3070) at org.redisson.codec.JsonJacksonCodec$2.decode(JsonJacksonCodec.java:92) at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:345) at org.redisson.client.handler.CommandDecoder.decodeList(CommandDecoder.java:406) at org.redisson.client.handler.CommandDecoder.decodeFromCheckpoint(CommandDecoder.java:196) at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:122) at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:489) at io.netty.handler.codec.ReplayingDecoder.callDecode(ReplayingDecoder.java:366) at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:265) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965) at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:647) at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:582) at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:499) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:461) at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884) at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ... 1 common frames omitted 2019-03-06 11:12:38.933 [http-nio-9850-exec-3] ERROR o.a.c.core.ContainerBase.[Tomcat].[localhost] - Exception Processing ErrorPage[errorCode=0, location=/error] org.redisson.client.RedisException: Unexpected exception while processing command at org.redisson.command.CommandAsyncService.convertException(CommandAsyncService.java:343) at org.redisson.command.CommandAsyncService.get(CommandAsyncService.java:170) at org.redisson.RedissonObject.get(RedissonObject.java:74) at org.redisson.RedissonMap.readAllEntrySet(RedissonMap.java:426) at org.redisson.spring.session.RedissonSessionRepository$RedissonSession.load(RedissonSessionRepository.java:96) at org.redisson.spring.session.RedissonSessionRepository.findById(RedissonSessionRepository.java:310) at org.redisson.spring.session.RedissonSessionRepository.findById(RedissonSessionRepository.java:52) at org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.getRequestedSession(SessionRepositoryFilter.java:364) at org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.getSession(SessionRepositoryFilter.java:301) at org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.getSession(SessionRepositoryFilter.java:197) at org.springframework.web.util.WebUtils.getSessionId(WebUtils.java:287) at org.springframework.web.servlet.FrameworkServlet.publishRequestHandledEvent(FrameworkServlet.java:1078) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) 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.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal(SessionRepositoryFilter.java:147) at org.springframework.session.web.http.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:81) 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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:728) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:472) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:395) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:316) at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:395) at org.apache.catalina.core.StandardHostValve.status(StandardHostValve.java:254) at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:349) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:175) 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: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$SocketProcessor.doRun(NioEndpoint.java:1468) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$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.fasterxml.jackson.databind.exc.InvalidTypeIdException: Could not resolve type id 'com."sku.common.model.JavaMerchant' as a subtype of [simple type, class java.lang.Object]: no such class found at [Source: (io.netty.buffer.ByteBufInputStream); line: 1, column: 11] at com.fasterxml.jackson.databind.exc.InvalidTypeIdException.from(InvalidTypeIdException.java:43) at com.fasterxml.jackson.databind.DeserializationContext.invalidTypeIdException(DeserializationContext.java:1628) at com.fasterxml.jackson.databind.DeserializationContext.handleUnknownTypeId(DeserializationContext.java:1186) at com.fasterxml.jackson.databind.jsontype.impl.ClassNameIdResolver._typeFromId(ClassNameIdResolver.java:53)
二、异常信息分析
通过打印的异常，可以确定三个问题：
1.找不到com.sku.common.model.JavaMerchant这个类（JavaMerchant是其他项目中的实体类），说明我们项目读取到了其他项目(SKU项目路)存储的数据
Caused by: com.fasterxml.jackson.databind.exc.InvalidTypeIdException: Could not resolve type id 'com.sku.common.model.JavaMerchant' as a subtype of [simple type, class java.lang.Object]: no such class found
2.涉及到redisson，说明和redis相关
ERROR org.redisson.client.handler.CommandDecoder - Unable to decode data. channel
3.涉及到tomcat，说明和容器有关
at org.apache.tomcat.util.net.SocketProcessorBase.
三、解决方案
通过上面的分支，定位到了项目SKU，发现该项目使用了HttpSession存值数据。
httpRequest.getSession().setAttribute("merchant", JSONObject.parseObject(JSON.toJSONString(apiResponse.getData()), JavaMerchant.class));
并且该项目和我们项目连的redis是一个，datebase也是同一个。然后通过看代码，发现我们项目引入了spring-session，也就是session共享，Session().setAttribute存储的数据，将存储到redis，并且其他项目也能访问到
<!-- http session -->
<dependency>
<groupId>org.springframework.session</groupId>
<artifactId>spring-session-data-redis</artifactId>
</dependency>
所以解决办法就是
项目中不要使用httpRequest.getSession().setAttribute存储数据