java - 无法从 JSON 转换；意外字符（'f'（代码 102））：在（字符串）“5f19a7e99933db43cb23e83d”处的根级值之间需要空格分隔
问题描述
@KafkaListener(id = ProductTopicConstants.GET_PRODUCT, topics = ProductTopicConstants.GET_PRODUCT)
@SendTo
public Product GetProduct(String id) {
return _productRepository.findByid(id);
}
卡夫卡配置
@Configuration
public class KafkaConfiguration {
@Bean
public Map<String, Object> consumerConfigs() {
Map<String, Object> props = new HashMap<>();
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, JsonDeserializer.class);
return props;
}
@Bean
public ConsumerFactory<String, Object> consumerFactory() {
return new DefaultKafkaConsumerFactory<>(consumerConfigs(),
new StringDeserializer(),
new JsonDeserializer<>(Object.class));
}
@Bean
public ReplyingKafkaTemplate<String, Object, Object> replyer(ProducerFactory<String, Object> pf,
ConcurrentKafkaListenerContainerFactory<String, Object> containerFactory) {
containerFactory.setReplyTemplate(kafkaTemplate(pf));
ConcurrentMessageListenerContainer<String, Object> container = replyContainer(containerFactory);
ReplyingKafkaTemplate<String, Object, Object> replyer = new ReplyingKafkaTemplate<>(pf, container);
return replyer;
}
@Bean
public ConcurrentMessageListenerContainer<String, Object> replyContainer(
ConcurrentKafkaListenerContainerFactory<String, Object> containerFactory) {
ConcurrentMessageListenerContainer<String, Object> container =
containerFactory.createContainer(ProductTopicConstants.LISTNER_CONTAINER);
container.getContainerProperties().setGroupId(ProductTopicConstants.LISTNER_CONTAINER);
containerFactory.setMessageConverter(new JsonMessageConverter());
container.setBatchErrorHandler(new BatchLoggingErrorHandler());
return container;
}
@Bean
public KafkaTemplate<String, Object> kafkaTemplate(ProducerFactory<String, Object> pf) {
return new KafkaTemplate<>(pf);
}
}
卡夫卡制作人
@Override
public ProductViewModel GetProduct(String id) throws InterruptedException, ExecutionException, TimeoutException {
RequestReplyFuture<String, Object, Object> future =
this._replyTemplate.sendAndReceive(new ProducerRecord<>(ProductTopicConstants.GET_PRODUCT, 0, null,id));
LOG.info(future.getSendFuture().get(10, TimeUnit.SECONDS).getRecordMetadata().toString());
var products = (Product)future.get(10, TimeUnit.SECONDS).value();
var mappedProducts = mapper.convertValue(products, new TypeReference<Product>() { });
return new ProductViewModel(mappedProducts.getId(), mappedProducts.getName(), mappedProducts.getPrice(), mappedProducts.getDescription());
}
卡夫卡配置
spring:
profiles:
active: dev
kafka:
bootstrapAddress: localhost:9092
producer:
key-serializer: org.springframework.kafka.support.serializer.JsonSerializer
value-serializer: org.springframework.kafka.support.serializer.JsonSerializer
consumer:
key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
value-deserializer: org.apache.kafka.common.serialization.StringDeserializer
auto-offset-reset: earliest
properties:
spring:
json:
trusted:
packages: '*'
话题
@Bean
public static NewTopic GetProduct() {
return new NewTopic(ProductTopicConstants.GET_PRODUCT, 1, (short) 1);
}
@Bean
public NewTopic GetProducts() {
return TopicBuilder.name(ProductTopicConstants.GET_PRODUCTS).partitions(1).replicas(1).build();
}
@Bean
public NewTopic GetProductsContainer() {
return TopicBuilder.name(ProductTopicConstants.LISTNER_CONTAINER).partitions(1).replicas(1).build();
}
错误
org.springframework.kafka.KafkaException: Seek to current after exception; nested exception is org.springframework.kafka.listener.ListenerExecutionFailedException: Listener failed; nested exception is org.springframework.kafka.support.converter.ConversionException: Failed to convert from JSON; nested exception is com.fasterxml.jackson.core.JsonParseException: Unexpected character ('f' (code 102)): Expected space separating root-level values
at [Source: (String)"5f19a7e99933db43cb23e83d"; line: 1, column: 3]
at org.springframework.kafka.listener.SeekUtils.seekOrRecover(SeekUtils.java:157) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.SeekToCurrentErrorHandler.handle(SeekToCurrentErrorHandler.java:103) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeErrorHandler(KafkaMessageListenerContainer.java:1887) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeRecordListener(KafkaMessageListenerContainer.java:1792) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeWithRecords(KafkaMessageListenerContainer.java:1719) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeRecordListener(KafkaMessageListenerContainer.java:1617) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeListener(KafkaMessageListenerContainer.java:1348) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.pollAndInvoke(KafkaMessageListenerContainer.java:1064) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.run(KafkaMessageListenerContainer.java:972) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) ~[na:na]
at java.base/java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:264) ~[na:na]
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java) ~[na:na]
at java.base/java.lang.Thread.run(Thread.java:832) ~[na:na]
Caused by: org.springframework.kafka.listener.ListenerExecutionFailedException: Listener failed; nested exception is org.springframework.kafka.support.converter.ConversionException: Failed to convert from JSON; nested exception is com.fasterxml.jackson.core.JsonParseException: Unexpected character ('f' (code 102)): Expected space separating root-level values
at [Source: (String)"5f19a7e99933db43cb23e83d"; line: 1, column: 3]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.decorateException(KafkaMessageListenerContainer.java:1902) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
... 11 common frames omitted
Caused by: org.springframework.kafka.support.converter.ConversionException: Failed to convert from JSON; nested exception is com.fasterxml.jackson.core.JsonParseException: Unexpected character ('f' (code 102)): Expected space separating root-level values
at [Source: (String)"5f19a7e99933db43cb23e83d"; line: 1, column: 3]
at org.springframework.kafka.support.converter.JsonMessageConverter.extractAndConvertValue(JsonMessageConverter.java:117) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.support.converter.MessagingMessageConverter.toMessage(MessagingMessageConverter.java:123) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.adapter.MessagingMessageListenerAdapter.toMessagingMessage(MessagingMessageListenerAdapter.java:309) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.adapter.RecordMessagingMessageListenerAdapter.onMessage(RecordMessagingMessageListenerAdapter.java:77) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.adapter.RecordMessagingMessageListenerAdapter.onMessage(RecordMessagingMessageListenerAdapter.java:51) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeOnMessage(KafkaMessageListenerContainer.java:1854) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeOnMessage(KafkaMessageListenerContainer.java:1836) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeRecordListener(KafkaMessageListenerContainer.java:1779) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
... 9 common frames omitted
Caused by: com.fasterxml.jackson.core.JsonParseException: Unexpected character ('f' (code 102)): Expected space separating root-level values
at [Source: (String)"5f19a7e99933db43cb23e83d"; line: 1, column: 3]
at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:1851) ~[jackson-core-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:707) ~[jackson-core-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.core.base.ParserMinimalBase._reportUnexpectedChar(ParserMinimalBase.java:632) ~[jackson-core-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.core.base.ParserMinimalBase._reportMissingRootWS(ParserMinimalBase.java:679) ~[jackson-core-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.core.json.ReaderBasedJsonParser._verifyRootSpace(ReaderBasedJsonParser.java:1703) ~[jackson-core-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.core.json.ReaderBasedJsonParser._parsePosNumber(ReaderBasedJsonParser.java:1346) ~[jackson-core-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.core.json.ReaderBasedJsonParser.nextToken(ReaderBasedJsonParser.java:773) ~[jackson-core-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.databind.ObjectMapper._initForReading(ObjectMapper.java:4620) ~[jackson-databind-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4469) ~[jackson-databind-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3434) ~[jackson-databind-2.11.0.jar:2.11.0]
at org.springframework.kafka.support.converter.JsonMessageConverter.extractAndConvertValue(JsonMessageConverter.java:114) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
... 16 common frames omitted
2020-07-26 21:52:47.026 INFO 3997 --- [etProduct-0-C-1] o.a.k.clients.consumer.KafkaConsumer : [Consumer clientId=consumer-GetProduct-4, groupId=GetProduct] Seeking to offset 25 for partition GetProduct-0
2020-07-26 21:52:47.029 ERROR 3997 --- [etProduct-0-C-1] essageListenerContainer$ListenerConsumer : Error handler threw an exception
org.springframework.kafka.KafkaException: Seek to current after exception; nested exception is org.springframework.kafka.listener.ListenerExecutionFailedException: Listener failed; nested exception is org.springframework.kafka.support.converter.ConversionException: Failed to convert from JSON; nested exception is com.fasterxml.jackson.core.JsonParseException: Unexpected character ('f' (code 102)): Expected space separating root-level values
at [Source: (String)"5f19a7e99933db43cb23e83d"; line: 1, column: 3]
at org.springframework.kafka.listener.SeekUtils.seekOrRecover(SeekUtils.java:157) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.SeekToCurrentErrorHandler.handle(SeekToCurrentErrorHandler.java:103) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeErrorHandler(KafkaMessageListenerContainer.java:1887) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeRecordListener(KafkaMessageListenerContainer.java:1792) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeWithRecords(KafkaMessageListenerContainer.java:1719) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeRecordListener(KafkaMessageListenerContainer.java:1617) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeListener(KafkaMessageListenerContainer.java:1348) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.pollAndInvoke(KafkaMessageListenerContainer.java:1064) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.run(KafkaMessageListenerContainer.java:972) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) ~[na:na]
at java.base/java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:264) ~[na:na]
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java) ~[na:na]
at java.base/java.lang.Thread.run(Thread.java:832) ~[na:na]
Caused by: org.springframework.kafka.listener.ListenerExecutionFailedException: Listener failed; nested exception is org.springframework.kafka.support.converter.ConversionException: Failed to convert from JSON; nested exception is com.fasterxml.jackson.core.JsonParseException: Unexpected character ('f' (code 102)): Expected space separating root-level values
at [Source: (String)"5f19a7e99933db43cb23e83d"; line: 1, column: 3]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.decorateException(KafkaMessageListenerContainer.java:1902) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
... 11 common frames omitted
Caused by: org.springframework.kafka.support.converter.ConversionException: Failed to convert from JSON; nested exception is com.fasterxml.jackson.core.JsonParseException: Unexpected character ('f' (code 102)): Expected space separating root-level values
at [Source: (String)"5f19a7e99933db43cb23e83d"; line: 1, column: 3]
at org.springframework.kafka.support.converter.JsonMessageConverter.extractAndConvertValue(JsonMessageConverter.java:117) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.support.converter.MessagingMessageConverter.toMessage(MessagingMessageConverter.java:123) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.adapter.MessagingMessageListenerAdapter.toMessagingMessage(MessagingMessageListenerAdapter.java:309) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.adapter.RecordMessagingMessageListenerAdapter.onMessage(RecordMessagingMessageListenerAdapter.java:77) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.adapter.RecordMessagingMessageListenerAdapter.onMessage(RecordMessagingMessageListenerAdapter.java:51) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeOnMessage(KafkaMessageListenerContainer.java:1854) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeOnMessage(KafkaMessageListenerContainer.java:1836) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeRecordListener(KafkaMessageListenerContainer.java:1779) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
... 9 common frames omitted
Caused by: com.fasterxml.jackson.core.JsonParseException: Unexpected character ('f' (code 102)): Expected space separating root-level values
at [Source: (String)"5f19a7e99933db43cb23e83d"; line: 1, column: 3]
at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:1851) ~[jackson-core-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:707) ~[jackson-core-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.core.base.ParserMinimalBase._reportUnexpectedChar(ParserMinimalBase.java:632) ~[jackson-core-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.core.base.ParserMinimalBase._reportMissingRootWS(ParserMinimalBase.java:679) ~[jackson-core-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.core.json.ReaderBasedJsonParser._verifyRootSpace(ReaderBasedJsonParser.java:1703) ~[jackson-core-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.core.json.ReaderBasedJsonParser._parsePosNumber(ReaderBasedJsonParser.java:1346) ~[jackson-core-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.core.json.ReaderBasedJsonParser.nextToken(ReaderBasedJsonParser.java:773) ~[jackson-core-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.databind.ObjectMapper._initForReading(ObjectMapper.java:4620) ~[jackson-databind-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4469) ~[jackson-databind-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3434) ~[jackson-databind-2.11.0.jar:2.11.0]
at org.springframework.kafka.support.converter.JsonMessageConverter.extractAndConvertValue(JsonMessageConverter.java:114) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
... 16 common frames omitted
2020-07-26 21:52:47.534 INFO 3997 --- [etProduct-0-C-1] o.a.k.clients.consumer.KafkaConsumer : [Consumer clientId=consumer-GetProduct-4, groupId=GetProduct] Seeking to offset 25 for partition GetProduct-0
2020-07-26 21:52:47.537 ERROR 3997 --- [etProduct-0-C-1] essageListenerContainer$ListenerConsumer : Error handler threw an exception
org.springframework.kafka.KafkaException: Seek to current after exception; nested exception is org.springframework.kafka.listener.ListenerExecutionFailedException: Listener failed; nested exception is org.springframework.kafka.support.converter.ConversionException: Failed to convert from JSON; nested exception is com.fasterxml.jackson.core.JsonParseException: Unexpected character ('f' (code 102)): Expected space separating root-level values
at [Source: (String)"5f19a7e99933db43cb23e83d"; line: 1, column: 3]
at org.springframework.kafka.listener.SeekUtils.seekOrRecover(SeekUtils.java:157) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.SeekToCurrentErrorHandler.handle(SeekToCurrentErrorHandler.java:103) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeErrorHandler(KafkaMessageListenerContainer.java:1887) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeRecordListener(KafkaMessageListenerContainer.java:1792) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeWithRecords(KafkaMessageListenerContainer.java:1719) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeRecordListener(KafkaMessageListenerContainer.java:1617) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeListener(KafkaMessageListenerContainer.java:1348) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.pollAndInvoke(KafkaMessageListenerContainer.java:1064) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.run(KafkaMessageListenerContainer.java:972) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) ~[na:na]
at java.base/java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:264) ~[na:na]
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java) ~[na:na]
at java.base/java.lang.Thread.run(Thread.java:832) ~[na:na]
Caused by: org.springframework.kafka.listener.ListenerExecutionFailedException: Listener failed; nested exception is org.springframework.kafka.support.converter.ConversionException: Failed to convert from JSON; nested exception is com.fasterxml.jackson.core.JsonParseException: Unexpected character ('f' (code 102)): Expected space separating root-level values
at [Source: (String)"5f19a7e99933db43cb23e83d"; line: 1, column: 3]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.decorateException(KafkaMessageListenerContainer.java:1902) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
... 11 common frames omitted
Caused by: org.springframework.kafka.support.converter.ConversionException: Failed to convert from JSON; nested exception is com.fasterxml.jackson.core.JsonParseException: Unexpected character ('f' (code 102)): Expected space separating root-level values
at [Source: (String)"5f19a7e99933db43cb23e83d"; line: 1, column: 3]
at org.springframework.kafka.support.converter.JsonMessageConverter.extractAndConvertValue(JsonMessageConverter.java:117) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.support.converter.MessagingMessageConverter.toMessage(MessagingMessageConverter.java:123) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.adapter.MessagingMessageListenerAdapter.toMessagingMessage(MessagingMessageListenerAdapter.java:309) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.adapter.RecordMessagingMessageListenerAdapter.onMessage(RecordMessagingMessageListenerAdapter.java:77) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.adapter.RecordMessagingMessageListenerAdapter.onMessage(RecordMessagingMessageListenerAdapter.java:51) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeOnMessage(KafkaMessageListenerContainer.java:1854) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeOnMessage(KafkaMessageListenerContainer.java:1836) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeRecordListener(KafkaMessageListenerContainer.java:1779) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
... 9 common frames omitted
Caused by: com.fasterxml.jackson.core.JsonParseException: Unexpected character ('f' (code 102)): Expected space separating root-level values
at [Source: (String)"5f19a7e99933db43cb23e83d"; line: 1, column: 3]
at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:1851) ~[jackson-core-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:707) ~[jackson-core-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.core.base.ParserMinimalBase._reportUnexpectedChar(ParserMinimalBase.java:632) ~[jackson-core-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.core.base.ParserMinimalBase._reportMissingRootWS(ParserMinimalBase.java:679) ~[jackson-core-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.core.json.ReaderBasedJsonParser._verifyRootSpace(ReaderBasedJsonParser.java:1703) ~[jackson-core-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.core.json.ReaderBasedJsonParser._parsePosNumber(ReaderBasedJsonParser.java:1346) ~[jackson-core-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.core.json.ReaderBasedJsonParser.nextToken(ReaderBasedJsonParser.java:773) ~[jackson-core-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.databind.ObjectMapper._initForReading(ObjectMapper.java:4620) ~[jackson-databind-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4469) ~[jackson-databind-2.11.0.jar:2.11.0]
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3434) ~[jackson-databind-2.11.0.jar:2.11.0]
at org.springframework.kafka.support.converter.JsonMessageConverter.extractAndConvertValue(JsonMessageConverter.java:114) ~[spring-kafka-2.5.2.RELEASE.jar:2.5.2.RELEASE]
... 16 common frames omitted
2020-07-26 21:52:48.049 INFO 3997 --- [etProduct-0-C-1] o.a.k.clients.consumer.KafkaConsumer : [Consumer clientId=consumer-GetProduct-4, groupId=GetProduct] Seeking to offset 25 for partition GetProduct-0
2020-07-26 21:52:48.052 ERROR 3997 --- [etProduct-0-C-1] essageListenerContainer$ListenerConsumer : Error handler threw an exception
消费者控制台中的输出
我尝试过的所有组合，但没有一个有效
解决方案
您需要显示消费者端配置；您JsonMessageConverter正在应用双重 JSON 转换，这是不必要的，因为您已经将 JSON 转换为JsonDeserializer. 您要么需要用简单的解串器替换解串器，要么StringDeserializer转换ByteArrayDeserializer器需要转换一些东西。
编辑
所以，问题是你ProductListener有一个豆子
@Bean
public RecordMessageConverter converter() {
return new StringJsonMessageConverter();
}
并且 Boot 正在将其自动配置到侦听器容器工厂中，并且JsonDeserializer正如我所说，您正在执行双重反序列化。通过将该消息转换器 bean 添加到您的精简应用程序中，我能够重现它。
您可以为该侦听器使用不同的工厂，也可以覆盖侦听器本身的反序列化器...
@KafkaListener(id = ProductTopicConstants.GET_PRODUCT, topics = ProductTopicConstants.GET_PRODUCT,
clientIdPrefix = "getProd",
properties = ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG
+ "=org.apache.kafka.common.serialization.StringDeserializer")
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