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I have a basic POJO that contains a java.time.LocalDateTime:
package foo.bar.asire.api.model;
import java.time.LocalDateTime;
public class Address
{
private Long id;
private Integer houseNumber;
private String address;
private LocalDateTime created;
public Address()
{
super();
}
public Address(Long id, Integer houseNumber, String address, LocalDateTime created)
{
super();
this.id = id;
this.houseNumber = houseNumber;
this.address = address;
this.created = created;
}
public Long getId()
{
return id;
}
public void setId(Long id)
{
this.id = id;
}
public Integer getHouseNumber()
{
return houseNumber;
}
public void setHouseNumber(Integer houseNumber)
{
this.houseNumber = houseNumber;
}
public String getAddress()
{
return address;
}
public void setAddress(String address)
{
this.address = address;
}
public LocalDateTime getCreated()
{
return created;
}
public void setCreated(LocalDateTime created)
{
this.created = created;
}
@Override
public String toString()
{
return "Address [id=" + id + ", houseNumber=" + houseNumber
+ ", address=" + address + ", created=" + created + "]";
}
// @Override
// public String toString()
// {
// return "Address [id=" + id + ", houseNumber=" + houseNumber
// + ", address=" + address + "]";
// }
}
If I remove the LocalDateTime object, I am able to send/receive and create Address objects using the following code from my Consumer:
package foo.bar.consumer.config;
import java.util.HashMap;
import java.util.Map;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.common.serialization.StringDeserializer;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.annotation.EnableKafka;
import org.springframework.kafka.config.ConcurrentKafkaListenerContainerFactory;
import org.springframework.kafka.core.ConsumerFactory;
import org.springframework.kafka.core.DefaultKafkaConsumerFactory;
import org.springframework.kafka.support.serializer.JsonDeserializer;
import foo.bar.asire.api.model.Address;
@Configuration
@EnableKafka
public class KafkaConsumerConfig
{
@Value("${kafka.consumer.bootstrap}")
private String bootstrapServers;
@Value("${kafka.consumer.group}")
private String group;
@Bean
public Map<String, Object> consumerConfigs()
{
Map<String, Object> props = new HashMap<>();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, JsonDeserializer.class);
props.put(ConsumerConfig.GROUP_ID_CONFIG, group);
return props;
}
@Bean
public ConsumerFactory<String, Address> consumerFactory()
{
return new DefaultKafkaConsumerFactory<>(consumerConfigs(),
new StringDeserializer(),
new JsonDeserializer<>(Address.class));
}
@Bean
public ConcurrentKafkaListenerContainerFactory<String, Address> kafkaListenerContainerFactory()
{
ConcurrentKafkaListenerContainerFactory<String, Address> factory = new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(consumerFactory());
return factory;
}
}
Here is my AddressConsumer @Service:
package foo.bar.consumer.service;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.stereotype.Service;
import foo.bar.asire.api.model.Address;
@Service
public class AddressConsumer
{
private final Logger log = LoggerFactory.getLogger(this.getClass());
@KafkaListener(topics = "${kafka.consumer.topic}")
private void consumeAddress(Address address)
{
log.info("received address='{}'", address.toString());
}
}
However, when I use the original Address POJO with the LocalDateTime object, I get the following exception:
org.apache.kafka.common.errors.SerializationException: Error deserializing key/value for partition asire-0 at offset 29
Caused by: org.apache.kafka.common.errors.SerializationException: Can't deserialize data [[123, 34, 105, 100, 34, 58, 49, 44, 34, 104, 111, 117, 115, 101, 78, 117, 109, 98, 101, 114, 34, 58, 49, 50, 51, 52, 44, 34, 97, 100, 100, 114, 101, 115, 115, 34, 58, 34, 70, 111, 111, 98, 97, 114, 32, 76, 97, 110, 101, 34, 44, 34, 99, 114, 101, 97, 116, 101, 100, 34, 58, 123, 34, 100, 97, 121, 79, 102, 77, 111, 110, 116, 104, 34, 58, 50, 55, 44, 34, 100, 97, 121, 79, 102, 87, 101, 101, 107, 34, 58, 34, 83, 65, 84, 85, 82, 68, 65, 89, 34, 44, 34, 100, 97, 121, 79, 102, 89, 101, 97, 114, 34, 58, 49, 52, 55, 44, 34, 109, 111, 110, 116, 104, 34, 58, 34, 77, 65, 89, 34, 44, 34, 109, 111, 110, 116, 104, 86, 97, 108, 117, 101, 34, 58, 53, 44, 34, 121, 101, 97, 114, 34, 58, 50, 48, 49, 55, 44, 34, 104, 111, 117, 114, 34, 58, 49, 52, 44, 34, 109, 105, 110, 117, 116, 101, 34, 58, 53, 52, 44, 34, 110, 97, 110, 111, 34, 58, 49, 54, 53, 48, 48, 48, 48, 48, 48, 44, 34, 115, 101, 99, 111, 110, 100, 34, 58, 57, 44, 34, 99, 104, 114, 111, 110, 111, 108, 111, 103, 121, 34, 58, 123, 34, 105, 100, 34, 58, 34, 73, 83, 79, 34, 44, 34, 99, 97, 108, 101, 110, 100, 97, 114, 84, 121, 112, 101, 34, 58, 34, 105, 115, 111, 56, 54, 48, 49, 34, 125, 125, 125]] from topic [asire]
Caused by: com.fasterxml.jackson.databind.JsonMappingException: Can not construct instance of java.time.LocalDateTime: no suitable constructor found, can not deserialize from Object value (missing default constructor or creator, or perhaps need to add/enable type information?)
at [Source: [B@3ad71c11; line: 1, column: 63] (through reference chain: foo.bar.asire.api.model.Address["created"])
at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:270) ~[jackson-databind-2.8.8.jar:2.8.8]
at com.fasterxml.jackson.databind.DeserializationContext.instantiationException(DeserializationContext.java:1456) ~[jackson-databind-2.8.8.jar:2.8.8]
at com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1012) ~[jackson-databind-2.8.8.jar:2.8.8]
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1206) ~[jackson-databind-2.8.8.jar:2.8.8]
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:314) ~[jackson-databind-2.8.8.jar:2.8.8]
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:148) ~[jackson-databind-2.8.8.jar:2.8.8]
at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:504) ~[jackson-databind-2.8.8.jar:2.8.8]
at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:104) ~[jackson-databind-2.8.8.jar:2.8.8]
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:357) ~[jackson-databind-2.8.8.jar:2.8.8]
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:148) ~[jackson-databind-2.8.8.jar:2.8.8]
at com.fasterxml.jackson.databind.ObjectReader._bindAndClose(ObjectReader.java:1626) ~[jackson-databind-2.8.8.jar:2.8.8]
at com.fasterxml.jackson.databind.ObjectReader.readValue(ObjectReader.java:1237) ~[jackson-databind-2.8.8.jar:2.8.8]
at org.springframework.kafka.support.serializer.JsonDeserializer.deserialize(JsonDeserializer.java:86) ~[spring-kafka-1.2.1.RELEASE.jar:na]
at org.apache.kafka.clients.consumer.internals.Fetcher.parseRecord(Fetcher.java:869) ~[kafka-clients-0.10.2.0.jar:na]
at org.apache.kafka.clients.consumer.internals.Fetcher.parseCompletedFetch(Fetcher.java:775) ~[kafka-clients-0.10.2.0.jar:na]
at org.apache.kafka.clients.consumer.internals.Fetcher.fetchedRecords(Fetcher.java:473) ~[kafka-clients-0.10.2.0.jar:na]
at org.apache.kafka.clients.consumer.KafkaConsumer.pollOnce(KafkaConsumer.java:1062) ~[kafka-clients-0.10.2.0.jar:na]
at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:995) ~[kafka-clients-0.10.2.0.jar:na]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.run(KafkaMessageListenerContainer.java:556) ~[spring-kafka-1.2.1.RELEASE.jar:na]
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]
Here is my Maven pom.xml file, basically the same for both Consumer/Producer App:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>foo.bar</groupId>
<artifactId>consumer</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>consumer</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.kafka</groupId>
<artifactId>spring-kafka</artifactId>
<version>1.2.1.RELEASE</version>
</dependency>
<dependency>
<groupId>foo.bar</groupId>
<artifactId>asire-api</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>22.0</version>
</dependency>
<!-- Jackson Dependencies -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-jsr310</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.kafka</groupId>
<artifactId>spring-kafka-test</artifactId>
<version>1.2.1.RELEASE</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-core</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-core</artifactId>
<version>2.7.22</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Here is my application.properties file for my Consumer, but my Producer is about the same:
server.port=8081
spring.jackson.serialization.write_dates_as_timestamps=false
kafka.consumer.bootstrap=localhost:9092
kafka.consumer.topic=asire
kafka.consumer.group=AsireGroup
222
Right or wrong, I was able to get this to properly do the JsonSerialization/JsonDeserialization by modifying the original Address POJO with the following changes. Added the following imports:
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
Added the following annotations:
@JsonSerialize(using = LocalDateTimeSerializer.class)
@JsonDeserialize(using = LocalDateTimeDeserializer.class)
private LocalDateTime created;
You should use Datatype module for those Java 8 date time types: serialize/deserialize java 8 java.time with Jackson JSON mapper:
objectMapper.registerModule(new JSR310Module())
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