springboot-kafkajava8时间序列化

目前与spring-kafka 2.1.8.RELEASE一起使用spring-boot 2.0.4。我想简化交换，将对象发送到kafka模板，并使用json作为格式。但是，一些需要反序列化的消息包含java.time.LocalDateTime。所以我的设置是

配置（application.yml）：

spring:
  jackson:
    serialization:
      write_dates_as_timestamps: false
  kafka:
    consumer:
      group-id: foo
      enable-auto-commit: true
      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
      value-deserializer: org.springframework.kafka.support.serializer.JsonDeserializer
      properties:
        spring.json.trusted.packages: my.package
    producer:
      value-serializer: org.springframework.kafka.support.serializer.JsonSerializer
      key-serializer: org.apache.kafka.common.serialization.StringSerializer
      properties:
        spring.json.trusted.packages: my.package
      retries: 3
      acks: all

至于应该工作的杰克逊依赖关系，我的依赖关系树是：

[INFO] |  |  +- com.fasterxml.jackson.core:jackson-databind:jar:2.9.6:compile
[INFO] |  |  |  +- com.fasterxml.jackson.core:jackson-annotations:jar:2.9.0:compile
[INFO] |  |  |  \- com.fasterxml.jackson.core:jackson-core:jar:2.9.6:compile
[INFO] |  |  \- com.fasterxml.jackson.datatype:jackson-datatype-jsr310:jar:2.9.6:compile
[INFO] |  |  +- com.fasterxml.jackson.datatype:jackson-datatype-jdk8:jar:2.9.6:compile
[INFO] |  |  \- com.fasterxml.jackson.module:jackson-module-parameter-names:jar:2.9.6:compile

但是，这会产生以下错误：

org.apache.kafka.common.errors.SerializationException: Error deserializing key/value for partition Foo-0 at offset 4. If needed, please seek past the record to continue consumption.
Caused by: org.apache.kafka.common.errors.SerializationException: Can't deserialize data [[123, 34, 105, 100, 34, 58, 34, 97, 50, 99, 50, 56, 99, 99, 101, 97, 49, 98, 98, 52, 51, 97, 97, 56, 53, 50, 49, 53, 99, 101, 49, 54, 57, 48, 52, 51, 51, 98, 51, 45, 50, 34, 44, 34, 97, 117, 116, 104, 111, 114, 34, 58, 34, 97, 110, 116, 111, 110, 105, 111, 34, 44, 34, 99, 114, 101, 97, 116, 101, 100, 34, 58, 123, 34, 104, 111, 117, 114, 34, 58, 49, 56, 44, 34, 109, 105, 110, 117, 116, 101, 34, 58, 52, 48, 44, 34, 115, 101, 99, 111, 110, 100, 34, 58, 53, 49, 44, 34, 110, 97, 110, 111, 34, 58, 51, 50, 53, 48, 48, 48, 48, 48, 48, 44, 34, 100, 97, 121, 79, 102, 89, 101, 97, 114, 34, 58, 50, 52, 48, 44, 34, 100, 97, 121, 79, 102, 87, 101, 101, 107, 34, 58, 34, 84, 85, 69, 83, 68, 65, 89, 34, 44, 34, 109, 111, 110, 116, 104, 34, 58, 34, 65, 85, 71, 85, 83, 84, 34, 44, 34, 100, 97, 121, 79, 102, 77, 111, 110, 116, 104, 34, 58, 50, 56, 44, 34, 121, 101, 97, 114, 34, 58, 50, 48, 49, 56, 44, 34, 109, 111, 110, 116, 104, 86, 97, 108, 117, 101, 34, 58, 56, 44, 34, 99, 104, 114, 111, 110, 111, 108, 111, 103, 121, 34, 58, 123, 34, 99, 97, 108, 101, 110, 100, 97, 114, 84, 121, 112, 101, 34, 58, 34, 105, 115, 111, 56, 54, 48, 49, 34, 44, 34, 105, 100, 34, 58, 34, 73, 83, 79, 34, 125, 125, 44, 34, 97, 103, 103, 114, 101, 103, 97, 116, 101, 73, 100, 34, 58, 34, 97, 50, 99, 50, 56, 99, 99, 101, 97, 49, 98, 98, 52, 51, 97, 97, 56, 53, 50, 49, 53, 99, 101, 49, 54, 57, 48, 52, 51, 51, 98, 51, 34, 44, 34, 118, 101, 114, 115, 105, 111, 110, 34, 58, 48, 44, 34, 112, 114, 105, 122, 101, 73, 110, 102, 111, 34, 58, 123, 34, 110, 117, 109, 98, 101, 114, 79, 102, 87, 105, 110, 110, 101, 114, 115, 34, 58, 49, 44, 34, 112, 114, 105, 122, 101, 80, 111, 111, 108, 34, 58, 49, 48, 44, 34, 112, 114, 105, 122, 101, 84, 97, 98, 108, 101, 34, 58, 91, 49, 48, 93, 125, 125]] from topic [Foo]
Caused by: com.fasterxml.jackson.databind.exc.MismatchedInputException: Expected array or string.
 at [Source: (byte[])"{"id":"a2c28ccea1bb43aa85215ce1690433b3-2","author":"foo","created":{"hour":18,"minute":40,"second":51,"nano":325000000,"dayOfYear":240,"dayOfWeek":"TUESDAY","month":"AUGUST","dayOfMonth":28,"year":2018,"monthValue":8,"chronology":{"calendarType":"iso8601","id":"ISO"}},"aggregateId":"a2c28ccea1bb43aa85215ce1690433b3","version":0,"prizeInfo":{"numberOfWinners":1,"prizePool":10,"prizeTable":[10]}}"; line: 1, column: 73] (through reference chain: my.package.Foo["created"])
    at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:63) ~[jackson-databind-2.9.6.jar:2.9.6]
    at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1342) ~[jackson-databind-2.9.6.jar:2.9.6]
    at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1138) ~[jackson-databind-2.9.6.jar:2.9.6]
    at com.fasterxml.jackson.datatype.jsr310.deser.JSR310DeserializerBase._handleUnexpectedToken(JSR310DeserializerBase.java:99) ~[jackson-datatype-jsr310-2.9.6.jar:2.9.6]
    at com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer.deserialize(LocalDateTimeDeserializer.java:141) ~[jackson-datatype-jsr310-2.9.6.jar:2.9.6]
    at com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer.deserialize(LocalDateTimeDeserializer.java:39) ~[jackson-datatype-jsr310-2.9.6.jar:2.9.6]
    at com.fasterxml.jackson.databind.deser.impl.FieldProperty.deserializeAndSet(FieldProperty.java:136) ~[jackson-databind-2.9.6.jar:2.9.6]
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:369) ~[jackson-databind-2.9.6.jar:2.9.6]
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:159) ~[jackson-databind-2.9.6.jar:2.9.6]
    at com.fasterxml.jackson.databind.ObjectReader._bindAndClose(ObjectReader.java:1611) ~[jackson-databind-2.9.6.jar:2.9.6]
    at com.fasterxml.jackson.databind.ObjectReader.readValue(ObjectReader.java:1234) ~[jackson-databind-2.9.6.jar:2.9.6]
    at org.springframework.kafka.support.serializer.JsonDeserializer.deserialize(JsonDeserializer.java:228) ~[spring-kafka-2.1.8.RELEASE.jar:2.1.8.RELEASE]
    at org.apache.kafka.clients.consumer.internals.Fetcher.parseRecord(Fetcher.java:923) ~[kafka-clients-1.0.2.jar:na]
    at org.apache.kafka.clients.consumer.internals.Fetcher.access$2600(Fetcher.java:93) ~[kafka-clients-1.0.2.jar:na]
    at org.apache.kafka.clients.consumer.internals.Fetcher$PartitionRecords.fetchRecords(Fetcher.java:1100) ~[kafka-clients-1.0.2.jar:na]
    at org.apache.kafka.clients.consumer.internals.Fetcher$PartitionRecords.access$1200(Fetcher.java:949) ~[kafka-clients-1.0.2.jar:na]
    at org.apache.kafka.clients.consumer.internals.Fetcher.fetchRecords(Fetcher.java:570) ~[kafka-clients-1.0.2.jar:na]
    at org.apache.kafka.clients.consumer.internals.Fetcher.fetchedRecords(Fetcher.java:531) ~[kafka-clients-1.0.2.jar:na]
    at org.apache.kafka.clients.consumer.KafkaConsumer.pollOnce(KafkaConsumer.java:1154) ~[kafka-clients-1.0.2.jar:na]
    at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1111) ~[kafka-clients-1.0.2.jar:na]
    at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.run(KafkaMessageListenerContainer.java:699) ~[spring-kafka-2.1.8.RELEASE.jar:2.1.8.RELEASE]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_131]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_131]
    at java.lang.Thread.run(Thread.java:748) [na:1.8.0_131]

因此，我尝试了以下操作，但到目前为止还没有成功：1.Custom ObjectMapper声明为bean

@Bean
public ObjectMapper objectMapper() {
    ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.registerModule(new JavaTimeModule());
    objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
    return objectMapper;
}

2. LocalDateTime字段上的Serializer批注

为了确保我具有正确的对象映射器设置和必要的依赖关系，我创建了一个rest控制器，将响应模拟为json，作为rest终结点返回带有日期时间字段的对象，这将正确返回；样品：

[
    {
        "playerId": "foo",
        "points": 10,
        "entryDateTime": "2018-08-19T09:30:20.051"
    },
    {
        "playerId": "bar",
        "points": 3,
        "entryDateTime": "2018-08-27T09:30:20.051"
    }
]

Farhad Abdol.. 5

将Json（De）Serializer构造函数与对象映射器参数一起使用对我来说很有效。我在对具有java.time.Instant字段的pojo进行反序列化时遇到了麻烦，因此，在对同一个org.apache.kafka.common.errors.SerializationException*** 进行数小时的故障排除后，我终于意识到了（借助此处的答案）不是春天，而是卡夫卡自己的序列化。给定我拥有的objectmapper bean，我通过将其自动装配到我的kafka生产者和消费者设置的JsonSerializer和JsonDeserializer参数中来解决。

@Configuration
public class JacksonConfig {

    @Bean
    @Primary
    public ObjectMapper objectMapper(Jackson2ObjectMapperBuilder builder) {
        ObjectMapper objectMapper = builder.build();
        objectMapper.registerModule(new JavaTimeModule());
        objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
        return objectMapper;
    }
}

@Configuration
public class KafkaProducerConfig {

    @Value(value="${kafka.bootstrapAddress}")
    private String bootstrapAddress;

    @Autowired
    private ObjectMapper objectMapper;

    @Bean
    public KafkaTemplate orderKafkaTemplate(){
        Map props = new HashMap<>();
        props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
        ProducerFactory producerFactory = new DefaultKafkaProducerFactory<>(props, new StringSerializer(), new JsonSerializer(objectMapper));

        return new KafkaTemplate<>(producerFactory);
    }
}

@Configuration
public class KafkaConsumerConfig {

    @Value(value="${kafka.bootstrapAddress}")
    private String bootstrapAddress;

    @Value(value="${kafka.consumer.groupId}")
    private String groupId;

    @Autowired
    private ObjectMapper objectMapper;

    @Bean
    public ConcurrentKafkaListenerContainerFactory orderKafkaListenerContainerFactory(){
        ConcurrentKafkaListenerContainerFactory factory = new ConcurrentKafkaListenerContainerFactory<>();

        Map props = new HashMap<>();
        props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
        props.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);
        ConsumerFactory cOnsumerFactory= new DefaultKafkaConsumerFactory<>(props, new StringDeserializer(), new JsonDeserializer<>(Order.class, objectMapper));

        factory.setConsumerFactory(consumerFactory);
        return factory;
    }

}

public class Order {

    private long accountId;
    private long assetId;
    private long quantity;
    private long price;
    private Instant createdOn = Instant.now();

    // no args constructor, constructor with params for all fields except createdOn, and getters/setters for all fields omitted

@Configuration
public class JacksonConfig {

    @Bean
    @Primary
    public ObjectMapper objectMapper(Jackson2ObjectMapperBuilder builder) {
        ObjectMapper objectMapper = builder.build();
        objectMapper.registerModule(new JavaTimeModule());
        objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
        return objectMapper;
    }
}

@Configuration
public class KafkaProducerConfig {

    @Value(value="${kafka.bootstrapAddress}")
    private String bootstrapAddress;

    @Autowired
    private ObjectMapper objectMapper;

    @Bean
    public KafkaTemplate orderKafkaTemplate(){
        Map props = new HashMap<>();
        props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
        ProducerFactory producerFactory = new DefaultKafkaProducerFactory<>(props, new StringSerializer(), new JsonSerializer(objectMapper));

        return new KafkaTemplate<>(producerFactory);
    }
}

@Configuration
public class KafkaConsumerConfig {

    @Value(value="${kafka.bootstrapAddress}")
    private String bootstrapAddress;

    @Value(value="${kafka.consumer.groupId}")
    private String groupId;

    @Autowired
    private ObjectMapper objectMapper;

    @Bean
    public ConcurrentKafkaListenerContainerFactory orderKafkaListenerContainerFactory(){
        ConcurrentKafkaListenerContainerFactory factory = new ConcurrentKafkaListenerContainerFactory<>();

        Map props = new HashMap<>();
        props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
        props.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);
        ConsumerFactory cOnsumerFactory= new DefaultKafkaConsumerFactory<>(props, new StringDeserializer(), new JsonDeserializer<>(Order.class, objectMapper));

        factory.setConsumerFactory(consumerFactory);
        return factory;
    }

}

public class Order {

    private long accountId;
    private long assetId;
    private long quantity;
    private long price;
    private Instant createdOn = Instant.now();

    // no args constructor, constructor with params for all fields except createdOn, and getters/setters for all fields omitted