当前位置： 首页 > news >正文

SpringCloudStreamkafka接收jsonarray字符串失败

news 2025/8/15 9:02:22

文章目录

    • 场景现象
    • 问题处理

场景现象

  • kafka作为消息队列，作为前端设备数据到后端消费的渠道，也被多个不同微服务消费
  • 一个服务与前端边缘计算设备建立socket消息，接收实时交通事件推送，再将事件发送到kafka里面。此处使用的是Spring Kafka，普通的将事件列表数据转化为字符串后发送
  • 事件信息，需要入库和实时推送，也需要被第三方服务调用，第三方也采取消费kafka的方式
  • 这个服务，作为kafka的消费者，读取事件数据，发送短信给指定用户，但此处使用的是Spring.cloud.stream，函数式编程，绑定kafka的topic
  • 此服务消费时，加了一些打印。但是事件推送到kafka后，看不到任何日志打印，也没有报错。但是使用kafka命令查看，却已经被该消费者消费掉了
  • 消费的源代码如下：
    @Beanpublic Consumer<String> boxEventTopicConsumer(HWTrafficEventManager hwTrafficEventManager) {log.info("Consumer Received (boxTopic): " + hwTrafficEventManager);return value -> {log.info("Consumer Received (boxTopic): " + value);// todo : do somethings};}

问题处理

  • 消费某个多分区topic时，发现只有其中一个分区数据有打印，其他都没有，但是查看却发现都消费掉了
2023-09-21 13:45:13.706  INFO 2184 --- [container-0-C-1] c.newatc.data.kafka.KafkaConfiguration   : Consumer Received (boxTopic): {"equipmentNo":0,"laneNum":4,"statisticsCycle":60,"time":1695275100110,"vehicleLanes":[{"averageParkingNum":0.5,"averageSpeed":6.1,"lane":1,"laneFlow":2,"maxQueueLength":12,"nonVehicleAverageTravelTime":0.0,"overStopLineFlow":2,"pedestrianAverageTravelTime":0,"vehicleAverageDelay":15.3,"vehicleAverageTravelTime":0.2},{"averageParkingNum":0.0,"averageSpeed":35.7,"lane":2,"laneFlow":1,"maxQueueLength":0,"nonVehicleAverageTravelTime":0.0,"overStopLineFlow":1,"pedestrianAverageTravelTime":0,"vehicleAverageDelay":0.0,"vehicleAverageTravelTime":0.0},{"averageParkingNum":0.0,"averageSpeed":0.0,"lane":3,"laneFlow":3,"maxQueueLength":0,"nonVehicleAverageTravelTime":0.0,"overStopLineFlow":0,"pedestrianAverageTravelTime":0,"vehicleAverageDelay":0.0,"vehicleAverageTravelTime":0.0},{"averageParkingNum":0.0,"averageSpeed":25.4,"lane":4,"laneFlow":1,"maxQueueLength":0,"nonVehicleAverageTravelTime":0.0,"overStopLineFlow":5,"pedestrianAverageTravelTime":0,"vehicleAverageDelay":0.0,"vehicleAverageTravelTime":1.6}]}
  • 最终测试发现，列表转化为jsonarray字符串，无法打印。但是单条数据json字符串却可以
  • 将代码改为String[]后发现报错，代码如下
    @Beanpublic Consumer<String[]> boxEventTopicConsumer(HWTrafficEventManager hwTrafficEventManager) {log.info("Consumer Received (boxTopic): " + hwTrafficEventManager);return value -> {log.info("Consumer Received (boxTopic): " + value.length);};}
  • 报错如下：
2023-09-21 11:47:59.684 ERROR 9112 --- [container-0-C-1] o.s.kafka.listener.DefaultErrorHandler   : Backoff none exhausted for boxTopic-3@29941org.springframework.kafka.listener.ListenerExecutionFailedException: Listener failed; nested exception is org.springframework.messaging.converter.MessageConversionException: Could not read JSON: Cannot deserialize value of type `[Ljava.lang.String;` from Object value (token `JsonToken.START_OBJECT`)at [Source: (byte[])"[{"equipmentNo":0,"eventCode":8,"eventType":1,"laneTurn":0,"relationNo":1,"time":1695267981221}]"; line: 1, column: 2] (through reference chain: java.lang.Object[][0]); nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize value of type `[Ljava.lang.String;` from Object value (token `JsonToken.START_OBJECT`)at [Source: (byte[])"[{"equipmentNo":0,"eventCode":8,"eventType":1,"laneTurn":0,"relationNo":1,"time":1695267981221}]"; line: 1, column: 2] (through reference chain: java.lang.Object[][0]), failedMessage=GenericMessage [payload=byte[96], headers={kafka_offset=29941, kafka_consumer=org.apache.kafka.clients.consumer.KafkaConsumer@3c31888e, deliveryAttempt=3, kafka_timestampType=CREATE_TIME, kafka_receivedPartitionId=3, kafka_receivedMessageKey=[B@3fcf7bd1, kafka_receivedTopic=boxTopic, kafka_receivedTimestamp=1695267871945, contentType=application/json, kafka_groupId=data-center}]at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.decorateException(KafkaMessageListenerContainer.java:2683)at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeOnMessage(KafkaMessageListenerContainer.java:2649)at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeOnMessage(KafkaMessageListenerContainer.java:2609)at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeRecordListener(KafkaMessageListenerContainer.java:2536)at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeWithRecords(KafkaMessageListenerContainer.java:2427)at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeRecordListener(KafkaMessageListenerContainer.java:2305)at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeListener(KafkaMessageListenerContainer.java:1979)at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeIfHaveRecords(KafkaMessageListenerContainer.java:1364)at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.pollAndInvoke(KafkaMessageListenerContainer.java:1355)at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.run(KafkaMessageListenerContainer.java:1247)at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)at java.base/java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:264)at java.base/java.util.concurrent.FutureTask.run(FutureTask.java)at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: org.springframework.messaging.converter.MessageConversionException: Could not read JSON: Cannot deserialize value of type `[Ljava.lang.String;` from Object value (token `JsonToken.START_OBJECT`)at [Source: (byte[])"[{"equipmentNo":0,"eventCode":8,"eventType":1,"laneTurn":0,"relationNo":1,"time":1695267981221}]"; line: 1, column: 2] (through reference chain: java.lang.Object[][0]); nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize value of type `[Ljava.lang.String;` from Object value (token `JsonToken.START_OBJECT`)at [Source: (byte[])"[{"equipmentNo":0,"eventCode":8,"eventType":1,"laneTurn":0,"relationNo":1,"time":1695267981221}]"; line: 1, column: 2] (through reference chain: java.lang.Object[][0])at org.springframework.messaging.converter.MappingJackson2MessageConverter.convertFromInternal(MappingJackson2MessageConverter.java:237)at org.springframework.cloud.stream.converter.ApplicationJsonMessageMarshallingConverter.convertFromInternal(ApplicationJsonMessageMarshallingConverter.java:113)at org.springframework.messaging.converter.AbstractMessageConverter.fromMessage(AbstractMessageConverter.java:185)at org.springframework.messaging.converter.AbstractMessageConverter.fromMessage(AbstractMessageConverter.java:176)at org.springframework.cloud.function.context.config.SmartCompositeMessageConverter.fromMessage(SmartCompositeMessageConverter.java:48)at org.springframework.cloud.function.context.catalog.SimpleFunctionRegistry$FunctionInvocationWrapper.convertInputMessageIfNecessary(SimpleFunctionRegistry.java:1282)at org.springframework.cloud.function.context.catalog.SimpleFunctionRegistry$FunctionInvocationWrapper.convertInputIfNecessary(SimpleFunctionRegistry.java:1057)at org.springframework.cloud.function.context.catalog.SimpleFunctionRegistry$FunctionInvocationWrapper.doApply(SimpleFunctionRegistry.java:696)at org.springframework.cloud.function.context.catalog.SimpleFunctionRegistry$FunctionInvocationWrapper.apply(SimpleFunctionRegistry.java:551)at org.springframework.cloud.stream.function.PartitionAwareFunctionWrapper.apply(PartitionAwareFunctionWrapper.java:84)at org.springframework.cloud.stream.function.FunctionConfiguration$FunctionWrapper.apply(FunctionConfiguration.java:754)at org.springframework.cloud.stream.function.FunctionConfiguration$FunctionToDestinationBinder$1.handleMessageInternal(FunctionConfiguration.java:586)at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:56)at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:115)at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:133)at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:106)at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:72)at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:317)at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:272)at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:187)at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:166)at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:47)at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:109)at org.springframework.integration.endpoint.MessageProducerSupport.sendMessage(MessageProducerSupport.java:216)at org.springframework.integration.kafka.inbound.KafkaMessageDrivenChannelAdapter.sendMessageIfAny(KafkaMessageDrivenChannelAdapter.java:397)at org.springframework.integration.kafka.inbound.KafkaMessageDrivenChannelAdapter.access$300(KafkaMessageDrivenChannelAdapter.java:83)at org.springframework.integration.kafka.inbound.KafkaMessageDrivenChannelAdapter$IntegrationRecordMessageListener.onMessage(KafkaMessageDrivenChannelAdapter.java:454)at org.springframework.integration.kafka.inbound.KafkaMessageDrivenChannelAdapter$IntegrationRecordMessageListener.onMessage(KafkaMessageDrivenChannelAdapter.java:428)at org.springframework.kafka.listener.adapter.RetryingMessageListenerAdapter.lambda$onMessage$0(RetryingMessageListenerAdapter.java:125)at org.springframework.retry.support.RetryTemplate.doExecute(RetryTemplate.java:329)at org.springframework.retry.support.RetryTemplate.execute(RetryTemplate.java:255)at org.springframework.kafka.listener.adapter.RetryingMessageListenerAdapter.onMessage(RetryingMessageListenerAdapter.java:119)at org.springframework.kafka.listener.adapter.RetryingMessageListenerAdapter.onMessage(RetryingMessageListenerAdapter.java:42)at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeOnMessage(KafkaMessageListenerContainer.java:2629)... 12 common frames omitted
Caused by: com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize value of type `[Ljava.lang.String;` from Object value (token `JsonToken.START_OBJECT`)at [Source: (byte[])"[{"equipmentNo":0,"eventCode":8,"eventType":1,"laneTurn":0,"relationNo":1,"time":1695267981221}]"; line: 1, column: 2] (through reference chain: java.lang.Object[][0])at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:59)at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1741)at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1515)at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1420)at com.fasterxml.jackson.databind.DeserializationContext.extractScalarFromObject(DeserializationContext.java:932)at com.fasterxml.jackson.databind.deser.std.StdDeserializer._parseString(StdDeserializer.java:1292)at com.fasterxml.jackson.databind.deser.std.StringArrayDeserializer.deserialize(StringArrayDeserializer.java:166)at com.fasterxml.jackson.databind.deser.std.StringArrayDeserializer.deserialize(StringArrayDeserializer.java:25)at com.fasterxml.jackson.databind.deser.DefaultDeserializationContext.readRootValue(DefaultDeserializationContext.java:322)at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4674)at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3723)at org.springframework.messaging.converter.MappingJackson2MessageConverter.convertFromInternal(MappingJackson2MessageConverter.java:223)... 45 common frames omitted
  • 通过日志可以看出，是在接收数据的解析时发生了问题，jsonarray的字符串无法接受解析
  • 在消息发生时，在正常消息后面，加一个“-”，可以正常接收了，就是解析时需要先删掉尾字符再转json
  • 后面又发现，如果是作为字符接收，再转为字符串，是可以的
http://www.lryc.cn/news/179253.html

相关文章：

  • 面向对象特性分析大全集
  • 【数据结构】队列和栈
  • WordPress主题开发（ 十）之—— 条件标签函数（上）
  • vue学习-10vue整合SpringBoot跨域请求
  • ElasticSearch - 基于 JavaRestClient 查询文档（match、精确、复合查询，以及排序、分页、高亮）
  • 简易实现通讯录（2.0）
  • Jasypt 实现自定义加解密
  • Leetcode 554. 砖墙
  • Python 内置函数详解 (3) 进制转换
  • SPSS列联表分析
  • 聊聊并发编程——并发容器和阻塞队列
  • 我庄严承诺终生不去承德旅游
  • 【python】python实现杨辉三角的三种方法
  • GitHub 基本操作
  • Docker和Docker compose的安装使用指南
  • 51单片机控制电动机正反转，PWM调速，记录转动圈数。
  • JAVA学习（方法的定义和调用）
  • Linux（CentOS/Ubuntu）——安装nginx
  • 26962-2011 高频电磁场综合水处理器技术条件
  • 图扑软件受邀亮相 IOTE 2023 国际物联网展
  • C语言文件操作与管理
  • 蓝桥等考Python组别八级005
  • JUnit介绍
  • （高阶) Redis 7 第16讲 预热/雪崩/击穿/穿透 缓存篇
  • (三) gitblit管理员手册
  • ESKF算法融合GNSS与IMU信息,航向角的偏差是如何逐渐影响到重力加速度g以及位置偏差的 CSDN gpt
  • Java初始化大量数据到Neo4j中(二)
  • flink1.17安装
  • SLAM从入门到精通（gmapping建图）
  • 中国312个历史文化名镇及景区空间点位数据集