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BAEL-6057 - Implementing Retry In Kafka Consumer (#13274) 

* BAEL-6057 - Implementing Retry In Kafka Consumer

(moved code example to new module)

* BAEL-6057 - Implementing Retry In Kafka Consumer

(fix on README.md)

Co-authored-by: Cesare <cesare.valenti@hotmail.com>
This commit is contained in:
cesarevalenti90 2023-01-11 22:25:43 +01:00 committed by GitHub
parent 7a202296a7
commit f396ff0341
17 changed files with 548 additions and 41 deletions
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7
spring-kafka-2/README.md Normal file
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## Spring Kafka 2
This module contains articles about Spring with Kafka
### Relevant articles
- [Implementing Retry In Kafka Consumer]

70
spring-kafka-2/pom.xml Normal file
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<?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>
<artifactId>spring-kafka</artifactId>
<name>spring-kafka</name>
<description>Intro to Kafka with Spring</description>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-boot-2</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../parent-boot-2</relativePath>
</parent>
<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>
</dependency>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-streams</artifactId>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.kafka</groupId>
<artifactId>spring-kafka-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.testcontainers</groupId>
<artifactId>kafka</artifactId>
<version>${testcontainers-kafka.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.testcontainers</groupId>
<artifactId>junit-jupiter</artifactId>
<version>${testcontainers-kafka.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.awaitility</groupId>
<artifactId>awaitility</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<properties>
<testcontainers-kafka.version>1.16.2</testcontainers-kafka.version>
</properties>
</project>

37
spring-kafka-2/src/main/java/com/baeldung/spring/kafka/Farewell.java Normal file
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package com.baeldung.spring.kafka;
public class Farewell {
private String message;
private Integer remainingMinutes;
public Farewell() {
}
public Farewell(String message, Integer remainingMinutes) {
this.message = message;
this.remainingMinutes = remainingMinutes;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public Integer getRemainingMinutes() {
return remainingMinutes;
}
public void setRemainingMinutes(Integer remainingMinutes) {
this.remainingMinutes = remainingMinutes;
}
@Override
public String toString() {
return message + ". In " + remainingMinutes + "!";
}
}

37
spring-kafka-2/src/main/java/com/baeldung/spring/kafka/Greeting.java Normal file
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package com.baeldung.spring.kafka;
public class Greeting {
private String msg;
private String name;
public Greeting() {
}
public Greeting(String msg, String name) {
this.msg = msg;
this.name = name;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return msg + ", " + name + "!";
}
}

152
spring-kafka-2/src/main/java/com/baeldung/spring/kafka/KafkaConsumerConfig.java Normal file
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package com.baeldung.spring.kafka;
import java.net.SocketTimeoutException;
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.context.annotation.Primary;
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.listener.ContainerProperties;
import org.springframework.kafka.listener.DefaultErrorHandler;
import org.springframework.kafka.support.converter.RecordMessageConverter;
import org.springframework.kafka.support.converter.StringJsonMessageConverter;
import org.springframework.kafka.support.mapping.DefaultJackson2JavaTypeMapper;
import org.springframework.kafka.support.mapping.Jackson2JavaTypeMapper;
import org.springframework.kafka.support.serializer.JsonDeserializer;
import org.springframework.util.backoff.BackOff;
import org.springframework.util.backoff.FixedBackOff;
@EnableKafka
@Configuration
public class KafkaConsumerConfig {
@Value(value = "${spring.kafka.bootstrap-servers}")
private String bootstrapAddress;
@Value(value = "${kafka.backoff.interval}")
private Long interval;
@Value(value = "${kafka.backoff.max_failure}")
private Long maxAttempts;
public ConsumerFactory<String, String> consumerFactory(String groupId) {
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, StringDeserializer.class);
props.put(ConsumerConfig.MAX_PARTITION_FETCH_BYTES_CONFIG, "20971520");
props.put(ConsumerConfig.FETCH_MAX_BYTES_CONFIG, "20971520");
return new DefaultKafkaConsumerFactory<>(props);
}
public ConcurrentKafkaListenerContainerFactory<String, String> kafkaListenerContainerFactory(String groupId) {
ConcurrentKafkaListenerContainerFactory<String, String> factory = new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(consumerFactory(groupId));
return factory;
}
@Bean
public ConcurrentKafkaListenerContainerFactory<String, String> fooKafkaListenerContainerFactory() {
return kafkaListenerContainerFactory("foo");
}
@Bean
public ConcurrentKafkaListenerContainerFactory<String, String> barKafkaListenerContainerFactory() {
return kafkaListenerContainerFactory("bar");
}
@Bean
public ConcurrentKafkaListenerContainerFactory<String, String> headersKafkaListenerContainerFactory() {
return kafkaListenerContainerFactory("headers");
}
@Bean
public ConcurrentKafkaListenerContainerFactory<String, String> partitionsKafkaListenerContainerFactory() {
return kafkaListenerContainerFactory("partitions");
}
@Bean
public ConcurrentKafkaListenerContainerFactory<String, String> longMessageKafkaListenerContainerFactory() {
return kafkaListenerContainerFactory("longMessage");
}
@Bean
public ConcurrentKafkaListenerContainerFactory<String, String> filterKafkaListenerContainerFactory() {
ConcurrentKafkaListenerContainerFactory<String, String> factory = kafkaListenerContainerFactory("filter");
factory.setRecordFilterStrategy(record -> record.value()
.contains("World"));
return factory;
}
public ConsumerFactory<String, Greeting> greetingConsumerFactory() {
Map<String, Object> props = new HashMap<>();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
props.put(ConsumerConfig.GROUP_ID_CONFIG, "greeting");
return new DefaultKafkaConsumerFactory<>(props, new StringDeserializer(), new JsonDeserializer<>(Greeting.class));
}
@Bean
public ConcurrentKafkaListenerContainerFactory<String, Greeting> kafkaListenerContainerFactory() {
ConcurrentKafkaListenerContainerFactory<String, Greeting> factory = new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(greetingConsumerFactory());
return factory;
}
@Bean
public RecordMessageConverter multiTypeConverter() {
StringJsonMessageConverter converter = new StringJsonMessageConverter();
DefaultJackson2JavaTypeMapper typeMapper = new DefaultJackson2JavaTypeMapper();
typeMapper.setTypePrecedence(Jackson2JavaTypeMapper.TypePrecedence.TYPE_ID);
typeMapper.addTrustedPackages("com.baeldung.spring.kafka");
Map<String, Class<?>> mappings = new HashMap<>();
mappings.put("greeting", Greeting.class);
mappings.put("farewell", Farewell.class);
typeMapper.setIdClassMapping(mappings);
converter.setTypeMapper(typeMapper);
return converter;
}
@Bean
public ConsumerFactory<String, Object> multiTypeConsumerFactory() {
HashMap<String, Object> props = new HashMap<>();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
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_id_test");
return new DefaultKafkaConsumerFactory<>(props);
}
@Bean
@Primary
public ConcurrentKafkaListenerContainerFactory<String, Object> greetingKafkaListenerContainerFactory() {
ConcurrentKafkaListenerContainerFactory<String, Object> factory = new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(multiTypeConsumerFactory());
factory.setMessageConverter(multiTypeConverter());
factory.setCommonErrorHandler(errorHandler());
factory.getContainerProperties()
.setAckMode(ContainerProperties.AckMode.RECORD);
return factory;
}
@Bean
public DefaultErrorHandler errorHandler() {
BackOff fixedBackOff = new FixedBackOff(interval, maxAttempts);
DefaultErrorHandler errorHandler = new DefaultErrorHandler((consumerRecord, e) -> {
System.out.println(String.format("consumed record %s because this exception was thrown",consumerRecord.toString(),e.getClass().getName()));
}, fixedBackOff);
//Commented because of the test
//errorHandler.addRetryableExceptions(SocketTimeoutException.class,RuntimeException.class);
errorHandler.addNotRetryableExceptions(NullPointerException.class);
return errorHandler;
}
}

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spring-kafka-2/src/main/java/com/baeldung/spring/kafka/KafkaProducerConfig.java Normal file
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package com.baeldung.spring.kafka;
import java.util.HashMap;
import java.util.Map;
import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.common.serialization.StringSerializer;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.core.DefaultKafkaProducerFactory;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.kafka.core.ProducerFactory;
import org.springframework.kafka.support.serializer.JsonSerializer;
@Configuration
public class KafkaProducerConfig {
@Value(value = "${spring.kafka.bootstrap-servers}")
private String bootstrapAddress;
@Bean
public ProducerFactory<String, String> producerFactory() {
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, StringSerializer.class);
configProps.put(ProducerConfig.MAX_REQUEST_SIZE_CONFIG, "20971520");
return new DefaultKafkaProducerFactory<>(configProps);
}
@Bean
public KafkaTemplate<String, String> kafkaTemplate() {
return new KafkaTemplate<>(producerFactory());
}
@Bean
public ProducerFactory<String, Greeting> greetingProducerFactory() {
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, JsonSerializer.class);
return new DefaultKafkaProducerFactory<>(configProps);
}
@Bean
public KafkaTemplate<String, Greeting> greetingKafkaTemplate() {
return new KafkaTemplate<>(greetingProducerFactory());
}
@Bean
public ProducerFactory<String, Object> multiTypeProducerFactory() {
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, JsonSerializer.class);
configProps.put(JsonSerializer.TYPE_MAPPINGS, "greeting:com.baeldung.spring.kafka.Greeting, farewell:com.baeldung.spring.kafka.Farewell");
return new DefaultKafkaProducerFactory<>(configProps);
}
@Bean
public KafkaTemplate<String, Object> multiTypeKafkaTemplate() {
return new KafkaTemplate<>(multiTypeProducerFactory());
}
}

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spring-kafka-2/src/main/java/com/baeldung/spring/kafka/KafkaTopicConfig.java Normal file
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package com.baeldung.spring.kafka;
import java.util.HashMap;
import java.util.Map;
import org.apache.kafka.clients.admin.AdminClientConfig;
import org.apache.kafka.clients.admin.NewTopic;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.core.KafkaAdmin;
@Configuration
public class KafkaTopicConfig {
@Value(value = "${spring.kafka.bootstrap-servers}")
private String bootstrapAddress;
@Value(value = "${message.topic.name}")
private String topicName;
@Value(value = "${long.message.topic.name}")
private String longMsgTopicName;
@Value(value = "${partitioned.topic.name}")
private String partitionedTopicName;
@Value(value = "${filtered.topic.name}")
private String filteredTopicName;
@Value(value = "${greeting.topic.name}")
private String greetingTopicName;
@Value(value = "${multi.type.topic.name}")
private String multiTypeTopicName;
@Bean
public KafkaAdmin kafkaAdmin() {
Map<String, Object> configs = new HashMap<>();
configs.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
return new KafkaAdmin(configs);
}
@Bean
public NewTopic topic1() {
return new NewTopic(topicName, 1, (short) 1);
}
@Bean
public NewTopic topic2() {
return new NewTopic(partitionedTopicName, 6, (short) 1);
}
@Bean
public NewTopic topic3() {
return new NewTopic(filteredTopicName, 1, (short) 1);
}
@Bean
public NewTopic topic4() {
return new NewTopic(greetingTopicName, 1, (short) 1);
}
@Bean
public NewTopic topic5() {
NewTopic newTopic = new NewTopic(longMsgTopicName, 1, (short) 1);
Map<String, String> configs = new HashMap<>();
configs.put("max.message.bytes", "20971520");
newTopic.configs(configs);
return newTopic;
}
@Bean
public NewTopic multiTypeTopic() {
return new NewTopic(multiTypeTopicName, 1, (short) 1);
}
}

32
spring-kafka-2/src/main/java/com/baeldung/spring/kafka/MultiTypeKafkaListener.java Normal file
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@ -0,0 +1,32 @@
package com.baeldung.spring.kafka;
import org.springframework.kafka.annotation.KafkaHandler;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.messaging.MessagingException;
import org.springframework.stereotype.Component;
@Component
@KafkaListener(id = "multiGroup", topics = "multitype")
public class MultiTypeKafkaListener {
@KafkaHandler
//@RetryableTopic(backoff = @Backoff(value = 3000L), attempts = "5", autoCreateTopics = "false",include = SocketTimeoutException.class, exclude = NullPointerException.class)
public void handleGreeting(Greeting greeting) {
if (greeting.getName()
.equalsIgnoreCase("test")) {
throw new MessagingException("test not allowed");
}
System.out.println("Greeting received: " + greeting);
}
@KafkaHandler
public void handleF(Farewell farewell) {
System.out.println("Farewell received: " + farewell);
}
@KafkaHandler(isDefault = true)
public void unknown(Object object) {
System.out.println("Unkown type received: " + object);
}
}

0
spring-kafka/src/main/java/com/baeldung/spring/kafka/RetryableApplicationKafkaApp.java → spring-kafka-2/src/main/java/com/baeldung/spring/kafka/RetryableApplicationKafkaApp.java
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20
spring-kafka-2/src/main/resources/application.properties Normal file
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@ -0,0 +1,20 @@
spring.kafka.bootstrap-servers=localhost:9092
message.topic.name=baeldung
long.message.topic.name=longMessage
greeting.topic.name=greeting
filtered.topic.name=filtered
partitioned.topic.name=partitioned
multi.type.topic.name=multitype
# monitoring - lag analysis
monitor.kafka.bootstrap.config=localhost:9092
monitor.kafka.consumer.groupid=baeldungGrp
monitor.topic.name=baeldung
# monitoring - simulation
monitor.producer.simulate=true
monitor.consumer.simulate=true
monitor.kafka.consumer.groupid.simulate=baeldungGrpSimulate
test.topic=testtopic1
kafka.backoff.interval=9000
kafka.backoff.max_failure=5

13
spring-kafka-2/src/main/resources/logback.xml Normal file
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@ -0,0 +1,13 @@
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
</pattern>
</encoder>
</appender>
<root level="INFO">
<appender-ref ref="STDOUT" />
</root>
</configuration>

0
spring-kafka/src/test/java/com/baeldung/spring/kafka/KafkaRetryableIntegrationTest.java → spring-kafka-2/src/test/java/com/baeldung/spring/kafka/KafkaRetryableIntegrationTest.java
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14
spring-kafka-2/src/test/resources/application.yml Normal file
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@ -0,0 +1,14 @@
spring:
kafka:
consumer:
auto-offset-reset: earliest
group-id: baeldung
test:
topic: embedded-test-topic
monitor:
kafka:
bootstrap:
config: "PLAINTEXT://localhost:9085"
consumer:
groupid: "baeldungGrp"

19
spring-kafka-2/src/test/resources/logback-test.xml Normal file
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@ -0,0 +1,19 @@
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
</pattern>
</encoder>
</appender>
<root level="INFO">
<appender-ref ref="STDOUT" />
</root>
<!-- Reduce the noise as the consumer keeps trying to connect until the Kafka instance is available -->
<springProfile name="ssl">
<logger name="org.apache.kafka.clients.NetworkClient" level="ERROR" additivity="false"/>
</springProfile>
</configuration>

35
spring-kafka/src/main/java/com/baeldung/spring/kafka/KafkaConsumerConfig.java
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@ -1,6 +1,5 @@
package com.baeldung.spring.kafka;
import java.net.SocketTimeoutException;
import java.util.HashMap;
import java.util.Map;
@ -9,20 +8,15 @@ 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.context.annotation.Primary;
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.listener.ContainerProperties;
import org.springframework.kafka.listener.DefaultErrorHandler;
import org.springframework.kafka.support.converter.RecordMessageConverter;
import org.springframework.kafka.support.converter.StringJsonMessageConverter;
import org.springframework.kafka.support.mapping.DefaultJackson2JavaTypeMapper;
import org.springframework.kafka.support.mapping.Jackson2JavaTypeMapper;
import org.springframework.kafka.support.serializer.JsonDeserializer;
import org.springframework.util.backoff.BackOff;
import org.springframework.util.backoff.FixedBackOff;
@EnableKafka
@Configuration
@ -31,12 +25,6 @@ public class KafkaConsumerConfig {
@Value(value = "${spring.kafka.bootstrap-servers}")
private String bootstrapAddress;
@Value(value = "${kafka.backoff.interval}")
private Long interval;
@Value(value = "${kafka.backoff.max_failure}")
private Long maxAttempts;
public ConsumerFactory<String, String> consumerFactory(String groupId) {
Map<String, Object> props = new HashMap<>();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
@ -83,7 +71,7 @@ public class KafkaConsumerConfig {
public ConcurrentKafkaListenerContainerFactory<String, String> filterKafkaListenerContainerFactory() {
ConcurrentKafkaListenerContainerFactory<String, String> factory = kafkaListenerContainerFactory("filter");
factory.setRecordFilterStrategy(record -> record.value()
.contains("World"));
.contains("World"));
return factory;
}
@ -95,7 +83,7 @@ public class KafkaConsumerConfig {
}
@Bean
public ConcurrentKafkaListenerContainerFactory<String, Greeting> kafkaListenerContainerFactory() {
public ConcurrentKafkaListenerContainerFactory<String, Greeting> greetingKafkaListenerContainerFactory() {
ConcurrentKafkaListenerContainerFactory<String, Greeting> factory = new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(greetingConsumerFactory());
return factory;
@ -121,32 +109,15 @@ public class KafkaConsumerConfig {
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
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_id_test");
return new DefaultKafkaConsumerFactory<>(props);
}
@Bean
@Primary
public ConcurrentKafkaListenerContainerFactory<String, Object> greetingKafkaListenerContainerFactory() {
public ConcurrentKafkaListenerContainerFactory<String, Object> multiTypeKafkaListenerContainerFactory() {
ConcurrentKafkaListenerContainerFactory<String, Object> factory = new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(multiTypeConsumerFactory());
factory.setMessageConverter(multiTypeConverter());
factory.setCommonErrorHandler(errorHandler());
factory.getContainerProperties()
.setAckMode(ContainerProperties.AckMode.RECORD);
return factory;
}
@Bean
public DefaultErrorHandler errorHandler() {
BackOff fixedBackOff = new FixedBackOff(interval, maxAttempts);
DefaultErrorHandler errorHandler = new DefaultErrorHandler((consumerRecord, e) -> {
System.out.println(String.format("consumed record %s because this exception was thrown",consumerRecord.toString(),e.getClass().getName()));
}, fixedBackOff);
//Commented because of the test
//errorHandler.addRetryableExceptions(SocketTimeoutException.class,RuntimeException.class);
errorHandler.addNotRetryableExceptions(NullPointerException.class);
return errorHandler;
}
}

6
spring-kafka/src/main/java/com/baeldung/spring/kafka/MultiTypeKafkaListener.java
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@ -2,7 +2,6 @@ package com.baeldung.spring.kafka;
import org.springframework.kafka.annotation.KafkaHandler;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.messaging.MessagingException;
import org.springframework.stereotype.Component;
@Component
@ -10,12 +9,7 @@ import org.springframework.stereotype.Component;
public class MultiTypeKafkaListener {
@KafkaHandler
//@RetryableTopic(backoff = @Backoff(value = 3000L), attempts = "5", autoCreateTopics = "false",include = SocketTimeoutException.class, exclude = NullPointerException.class)
public void handleGreeting(Greeting greeting) {
if (greeting.getName()
.equalsIgnoreCase("test")) {
throw new MessagingException("test not allowed");
}
System.out.println("Greeting received: " + greeting);
}

3
spring-kafka/src/main/resources/application.properties
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@ -14,7 +14,4 @@ monitor.producer.simulate=true
monitor.consumer.simulate=true
monitor.kafka.consumer.groupid.simulate=baeldungGrpSimulate
test.topic=testtopic1
kafka.backoff.interval=9000
kafka.backoff.max_failure=5