[英]KafkaException: class is not an instance of org.apache.kafka.common.serialization.Deserializer
I want to implement Kafka producer which sends and receives Java Serialized Objects.我想实现发送和接收 Java 序列化对象的 Kafka 生产者。 I tried this:
我试过这个:
Producer:制片人:
@Configuration
public class KafkaProducerConfig {
@Value(value = "${kafka.bootstrapAddress}")
private String bootstrapAddress;
@Bean
public ProducerFactory<String, SaleRequestFactory> saleRequestFactoryProducerFactory() {
Map<String, Object> configProps = new HashMap<>();
configProps.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
configProps.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, SaleRequestFactory.class);
configProps.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, SaleRequestFactory.class);
return new DefaultKafkaProducerFactory<>(configProps);
}
@Bean
public ProducerFactory<String, String> producerFactory() {
Map<String, Object> configProps = new HashMap<>();
configProps.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
/*
Serialization configuration
*/
return new DefaultKafkaProducerFactory<>(configProps);
}
@Bean
public KafkaTemplate<String, SaleRequestFactory> saleRequestFactoryKafkaTemplate() {
return new KafkaTemplate<>(saleRequestFactoryProducerFactory());
}
@Bean
public KafkaTemplate<String, String> kafkaTemplate() {
return new KafkaTemplate<>(producerFactory());
}
} }
Send object:发送 object:
@Autowired
private KafkaTemplate<String, SaleRequestFactory> saleRequestFactoryKafkaTemplate;
private static String topic = "tp-sale";
private void perform(){
SaleRequestFactory obj = new SaleRequestFactory();
obj.setId(100);
ListenableFuture<SendResult<String, SaleRequestFactory>> send = saleRequestFactoryKafkaTemplate.send(topic, obj);
}
Consumer:消费者:
@EnableKafka
@Configuration
public class KafkaConsumerConfig {
@Value(value = "${kafka.bootstrapAddress}")
private String bootstrapAddress;
private String groupId = "test";
@Bean
public ConsumerFactory<String, SaleResponseFactory> consumerFactory() {
Map<String, Object> props = new HashMap<>();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
props.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, SaleResponseFactory.class);
return new DefaultKafkaConsumerFactory<>(props);
}
@Bean
public ConcurrentKafkaListenerContainerFactory<String, SaleResponseFactory> kafkaListenerContainerFactory() {
ConcurrentKafkaListenerContainerFactory<String, SaleResponseFactory> factory =
new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(consumerFactory());
return factory;
}
}
// Receive Object // 接收 Object
@KafkaListener(topics = "tp-sale")
public SaleResponseFactory transactionElavonAuthorizeProcess(@Payload SaleRequestFactory tf, @Headers MessageHeaders headers) throws Exception {
System.out.println(tf.getId());
SaleResponseFactory resObj = new SaleResponseFactory();
resObj.setUnique_id("123123");
return resObj;
}
When I deploy the Producer I get error during deployment:当我部署 Producer 时,我在部署过程中遇到错误:
Caused by: org.apache.kafka.common.KafkaException: class org.engine.plugin.transactions.factory.SaleResponseFactory is not an instance of org.apache.kafka.common.serialization.Deserializer
Custom object定制object
import org.apache.kafka.common.serialization.Serializer;
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Builder(toBuilder = true)
public class SaleRequestFactory implements Serializable, Serializer {
private static final long serialVersionUID = 1744050117179344127L;
private int id;
@Override
public byte[] serialize(String s, Object o) {
return new byte[0];
}
}
import org.apache.kafka.common.serialization.Deserializer;导入 org.apache.kafka.common.serialization.Deserializer; @Getter @Setter @NoArgsConstructor @AllArgsConstructor @Builder(toBuilder = true) public class SaleResponseFactory implements Serializable, Deserializer { private static final long serialVersionUID = 1744050117179344127L;
@Getter @Setter @NoArgsConstructor @AllArgsConstructor @Builder(toBuilder = true) public class SaleResponseFactory 实现可序列化、反序列化器 { private static final long serialVersionUID = 1744050117197; private String unique_id;
私有字符串 unique_id; @Override public Object deserialize(String s, byte[] bytes) { return null;
@Override public Object 反序列化(String s, byte[] bytes) { return null; } }
} }
Do you know how I can fix this issue?你知道我该如何解决这个问题吗?
EDIT: I tried this:编辑:我试过这个:
Producer:制片人:
@Configuration
public class KafkaProducerConfig {
@Value(value = "${kafka.bootstrapAddress}")
private String bootstrapAddress;
@Bean
public ProducerFactory<String, SaleRequestFactory> saleRequestFactoryProducerFactory() {
Map<String, Object> configProps = new HashMap<>();
configProps.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
configProps.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
configProps.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, SaleRequestFactorySerializer.class);
return new DefaultKafkaProducerFactory<>(configProps);
}
@Bean
public ProducerFactory<String, String> producerFactory() {
Map<String, Object> configProps = new HashMap<>();
configProps.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
return new DefaultKafkaProducerFactory<>(configProps);
}
@Bean
public KafkaTemplate<String, SaleRequestFactory> saleRequestFactoryKafkaTemplate() {
return new KafkaTemplate<>(saleRequestFactoryProducerFactory());
}
@Bean
public KafkaTemplate<String, String> kafkaTemplate() {
return new KafkaTemplate<>(producerFactory());
}
} }
Send object:发送 object:
@Autowired
private KafkaTemplate<String, SaleRequestFactory> saleRequestFactoryKafkaTemplate;
private static String topic = "tp-sale";
private void perform(){
SaleRequestFactory obj = new SaleRequestFactory();
obj.setId(100);
ListenableFuture<SendResult<String, SaleRequestFactory>> send = saleRequestFactoryKafkaTemplate.send(topic, obj);
}
Consumer:消费者:
@EnableKafka
@Configuration
public class KafkaConsumerConfig {
@Value(value = "${kafka.bootstrapAddress}")
private String bootstrapAddress;
private String groupId = "test";
@Bean
public ConsumerFactory<String, SaleResponseFactory> consumerFactory() {
Map<String, Object> props = new HashMap<>();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
props.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, SaleResponseFactoryDeserializer.class);
return new DefaultKafkaConsumerFactory<>(props);
}
@Bean
public ConcurrentKafkaListenerContainerFactory<String, SaleResponseFactory> kafkaListenerContainerFactory() {
ConcurrentKafkaListenerContainerFactory<String, SaleResponseFactory> factory =
new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(consumerFactory());
return factory;
}
}
// Receive Object // 接收 Object
@KafkaListener(topics = "tp-sale")
public SaleResponseFactory transactionElavonAuthorizeProcess(@Payload SaleRequestFactory tf, @Headers MessageHeaders headers) throws Exception {
System.out.println(tf.getId());
SaleResponseFactory resObj = new SaleResponseFactory();
resObj.setUnique_id("123123");
return resObj;
}
Custom objects自定义对象
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Builder(toBuilder = true)
public class SaleRequestFactory implements Serializable{
private static final long serialVersionUID = 1744050117179344127L;
private int id;
}
public class SaleRequestFactorySerializer implements Serializable, Serializer<SaleRequestFactory> {
@Override
public byte[] serialize(String topic, SaleRequestFactory data) {
// convert data to byte[]
ByteArrayOutputStream out = new ByteArrayOutputStream();
try
{
ObjectOutputStream outputStream = new ObjectOutputStream(out);
outputStream.writeObject(data);
out.close();
}
catch (IOException e)
{
e.printStackTrace();
}
return out.toByteArray();
}
}
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Builder(toBuilder = true)
public class SaleResponseFactory implements Serializable{
private static final long serialVersionUID = 1744050117179344127L;
private String unique_id;
}
public class SaleResponseFactoryDeserializer implements Serializable, Deserializer<SaleResponseFactory> {
@Override
public SaleResponseFactory deserialize(String topic, byte[] data) {
// convert data to SaleResponseFactory
SaleResponseFactory saleResponseFactory = null;
try
{
ByteArrayInputStream bis = new ByteArrayInputStream(data);
ObjectInputStream in = new ObjectInputStream(bis);
saleResponseFactory = (SaleResponseFactory) in.readObject();
in.close();
}
catch (IOException | ClassNotFoundException e)
{
e.printStackTrace();
}
return saleResponseFactory;
}
}
When I try to send message I get error:当我尝试发送消息时出现错误:
Caused by: org.apache.kafka.common.errors.SerializationException: Error deserializing key/value for partition tp-sale-0 at offset 0. If needed, please seek past the record to continue consumption.
Caused by: java.lang.ClassCastException: null
21:27:51.152 [org.springframework.kafka.KafkaListenerEndpointContainer#0-0-C-1] DEBUG KafkaMessageListenerContainer$ListenerConsumer[debug:296] - Commit list: {}
21:27:51.153 [org.springframework.kafka.KafkaListenerEndpointContainer#0-0-C-1] ERROR KafkaMessageListenerContainer$ListenerConsumer[error:149] - Consumer exception
java.lang.IllegalStateException: This error handler cannot process 'SerializationException's directly; please consider configuring an 'ErrorHandlingDeserializer' in the value and/or key deserializer
at org.springframework.kafka.listener.SeekUtils.seekOrRecover(SeekUtils.java:145)
at org.springframework.kafka.listener.SeekToCurrentErrorHandler.handle(SeekToCurrentErrorHandler.java:103)
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.handleConsumerException(KafkaMessageListenerContainer.java:1265)
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.run(KafkaMessageListenerContainer.java:1022)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.lang.Thread.run(Thread.java:835)
Caused by: org.apache.kafka.common.errors.SerializationException: Error deserializing key/value for partition tp-sale-0 at offset 0. If needed, please seek past the record to continue consumption.
Caused by: java.lang.ClassCastException: null
Do you know how I can fix this issue?你知道我该如何解决这个问题吗?
EDIT: I managed to implement these improvements:编辑:我设法实现了这些改进:
Producer:制片人:
@Configuration
public class KafkaProducerConfig {
@Value(value = "${kafka.bootstrapAddress}")
private String bootstrapAddress;
@Bean
public ProducerFactory<String, SaleRequestFactory> saleRequestFactoryProducerFactory() {
Map<String, Object> configProps = new HashMap<>();
configProps.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
configProps.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
configProps.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, SaleRequestFactorySerializer.class);
return new DefaultKafkaProducerFactory<>(configProps);
}
@Bean
public ProducerFactory<String, String> producerFactory() {
Map<String, Object> configProps = new HashMap<>();
configProps.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
return new DefaultKafkaProducerFactory<>(configProps);
}
@Bean
public KafkaTemplate<String, SaleRequestFactory> saleRequestFactoryKafkaTemplate() {
return new KafkaTemplate<>(saleRequestFactoryProducerFactory());
}
@Bean
public KafkaTemplate<String, String> kafkaTemplate() {
return new KafkaTemplate<>(producerFactory());
}
} }
Send object:发送 object:
@Autowired
private KafkaTemplate<String, SaleRequestFactory> saleRequestFactoryKafkaTemplate;
private static String topic = "tp-sale";
private void perform(){
SaleRequestFactory obj = new SaleRequestFactory();
obj.setId(100);
ListenableFuture<SendResult<String, SaleRequestFactory>> send = saleRequestFactoryKafkaTemplate.send(topic, obj);
}
Consumer:消费者:
@EnableKafka
@Configuration
public class KafkaConsumerConfig {
@Value(value = "${kafka.bootstrapAddress}")
private String bootstrapAddress;
private String groupId = "test";
@Bean
public ConsumerFactory<String, SaleResponseFactory> consumerFactory() {
Map<String, Object> props = new HashMap<>();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
props.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, SaleResponseFactoryDeserializer.class);
return new DefaultKafkaConsumerFactory<>(props);
}
@Bean
public ConcurrentKafkaListenerContainerFactory<String, SaleResponseFactory> kafkaListenerContainerFactory() {
ConcurrentKafkaListenerContainerFactory<String, SaleResponseFactory> factory =
new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(consumerFactory());
return factory;
}
}
Receive Object接收 Object
@KafkaListener(topics = "tp-sale")
public SaleResponseFactory transactionElavonAuthorizeProcess(@Payload SaleRequestFactory tf, @Headers MessageHeaders headers) throws Exception {
System.out.println(tf.getId());
SaleResponseFactory resObj = new SaleResponseFactory();
resObj.setUnique_id("123123");
return resObj;
}
Custom objects自定义对象
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Builder(toBuilder = true)
public class SaleRequestFactory implements Serializable{
private static final long serialVersionUID = 1744050117179344127L;
private int id;
}
public class SaleRequestFactorySerializer implements Serializable, Serializer<SaleRequestFactory> {
@Override
public byte[] serialize(String topic, SaleRequestFactory data) {
// convert data to byte[]
ByteArrayOutputStream out = new ByteArrayOutputStream();
try
{
ObjectOutputStream outputStream = new ObjectOutputStream(out);
outputStream.writeObject(data);
out.close();
}
catch (IOException e)
{
e.printStackTrace();
}
return out.toByteArray();
}
}
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Builder(toBuilder = true)
public class SaleResponseFactory implements Serializable{
private static final long serialVersionUID = 1744050117179344127L;
private String unique_id;
}
public class SaleResponseFactoryDeserializer implements Serializable, Deserializer<SaleResponseFactory> {
@Override
public SaleResponseFactory deserialize(String topic, byte[] data) {
// convert data to SaleResponseFactory
SaleResponseFactory saleResponseFactory = null;
try
{
ByteArrayInputStream bis = new ByteArrayInputStream(data);
ObjectInputStream in = new ObjectInputStream(bis);
saleResponseFactory = (SaleResponseFactory) in.readObject();
in.close();
}
catch (IOException | ClassNotFoundException e)
{
e.printStackTrace();
}
return saleResponseFactory;
}
}
When I send some message I get error:当我发送一些消息时,我收到错误:
13:03:53.675 [org.springframework.kafka.KafkaListenerEndpointContainer#0-0-C-1] DEBUG RecordMessagingMessageListenerAdapter[debug:296] - Listener method returned result [org.factory.SaleResponseFactory@69c400ab] - generating response message for it
13:03:53.675 [org.springframework.kafka.KafkaListenerEndpointContainer#0-0-C-1] DEBUG RecordMessagingMessageListenerAdapter[debug:296] - No replyTopic to handle the reply: org.factory.SaleResponseFactory@69c400ab
Do you know how I can solve this issue?你知道我该如何解决这个问题吗?
You are using different type to cast the object than what it was serialize with.您正在使用与序列化对象不同的类型来转换对象。 Not sure why you need to do that.
不知道为什么你需要这样做。 You can update your deserialize to something like below.
您可以将反序列化更新为如下所示的内容。
public class SaleRequestFactoryDeserializer implements Serializable, Deserializer<SaleRequestFactory> {
@Override
public SaleRequestFactory deserialize(String topic, byte[] data) {
...
saleRequestFactory = (SaleRequestFactory) in.readObject();
}
}
java.lang.ClassCastException: null
This also means your serialization didn't work as expected.这也意味着您的序列化没有按预期工作。 Make sure you have valid payload before you try to cast.
在尝试投射之前,请确保您拥有有效的有效载荷。
KEY_DESERIALIZER_CLASS_CONFIG is a class which deserializes the network value into proper Java classes. KEY_DESERIALIZER_CLASS_CONFIG 是一个将网络值反序列化为适当的 Java 类的类。 The class you provided doesn't do that.
您提供的课程不会这样做。
In most cases, StringDeserializer is used.在大多数情况下,使用 StringDeserializer。 Specify a proper deserializer to the factory properties.
为工厂属性指定适当的解串器。
For those who are using application.properties for kafka configuration parameters, make sure it looks like it对于那些将 application.properties 用于 kafka 配置参数的人,请确保它看起来像
spring.kafka.consumer.bootstrap-servers=localhost:8888
spring.kafka.consumer.group-id=message
spring.kafka.consumer.auto-offset-reset=earliest
spring.kafka.consumer.key-deserializer=org.apache.kafka.common.serialization.StringDeserializer
spring.kafka.consumer.value-deserializer=org.apache.kafka.common.serialization.StringDeserializer
spring.kafka.producer.bootstrap-servers=localhost:8888
spring.kafka.producer.key-serializer=org.apache.kafka.common.serialization.StringSerializer
spring.kafka.producer.value-serializer=org.apache.kafka.common.serialization.StringSerializer
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.