add listener change packing of class to command and query style

pom.xml

@@ -87,6 +87,15 @@
             <groupId>org.springframework.cloud</groupId>
             <artifactId>spring-cloud-starter-config</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.apache.kafka</groupId>
+            <artifactId>kafka-clients</artifactId>
+            <version>3.4.0</version> <!-- Use the latest version -->
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.kafka</groupId>
+            <artifactId>spring-kafka</artifactId>
+        </dependency>
     </dependencies>
 
     <dependencyManagement>

src/main/java/com/example/mmad/testapp/Listner/UserEventListener.java

@@ -0,0 +1,27 @@
+package com.example.mmad.testapp.Listner;
+
+import com.example.mmad.testapp.entity.UserEntity;
+import com.example.mmad.testapp.event.UserCreatedEvent;
+import com.example.mmad.testapp.repository.UserSnapshotRepository;
+import org.springframework.kafka.annotation.KafkaListener;
+import org.springframework.stereotype.Component;
+
+@Component
+public class UserEventListener {
+    private final UserSnapshotRepository userSnapshotRepository;
+
+    public UserEventListener(UserSnapshotRepository userSnapshotRepository) {
+        this.userSnapshotRepository = userSnapshotRepository;
+    }
+
+    @KafkaListener(topics = "user-commanded", groupId = "")
+    public void updatedUserSnapshot(UserCreatedEvent user) {
+        UserEntity userSnapshot = new UserEntity();
+        //Todo write an mapper
+        userSnapshot.setId(userSnapshot.getId());
+        userSnapshot.setUserName(user.getUsername());
+        userSnapshot.setEmail(user.getEmail());
+        userSnapshotRepository.save(userSnapshot);
+    }
+
+}

src/main/java/com/example/mmad/testapp/kafkaConsumerConfig/KafkaConsumerConfig.java

@@ -0,0 +1,52 @@
+package com.example.mmad.testapp.kafkaConsumerConfig;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import org.apache.kafka.clients.consumer.ConsumerConfig;
+import org.apache.kafka.common.serialization.StringDeserializer;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+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.DefaultKafkaConsumerFactory;
+import org.springframework.kafka.support.serializer.JsonDeserializer;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+@EnableKafka
+@Configuration
+@ConfigurationProperties(prefix = "spring.kafka.consumer")
+public class KafkaConsumerConfig {
+
+    private String bootstrapServers;
+
+    private String groupId;
+
+
+    @Bean
+    public DefaultKafkaConsumerFactory<String, List<?>> consumerFactory() {
+        JsonDeserializer<List<?>> deserializer =
+                new JsonDeserializer<>(new TypeReference<List<?>>() {
+                });
+        deserializer.setRemoveTypeHeaders(false);
+        deserializer.addTrustedPackages("*");
+        deserializer.setUseTypeMapperForKey(true);
+
+        Map<String, Object> config = new HashMap<>();
+        config.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
+        config.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);
+        config.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
+        config.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, deserializer);
+
+        return new DefaultKafkaConsumerFactory<>(config, new StringDeserializer(), deserializer);
+    }
+
+    @Bean
+    public ConcurrentKafkaListenerContainerFactory<String, List<?>> kafkaListenerContainerFactory() {
+        ConcurrentKafkaListenerContainerFactory<String, List<?>> factory = new ConcurrentKafkaListenerContainerFactory<>();
+        factory.setConsumerFactory(consumerFactory());
+        return factory;
+    }
+}

src/main/java/com/example/mmad/testapp/repository/UserSnapshotRepository.java

@@ -0,0 +1,7 @@
+package com.example.mmad.testapp.repository;
+
+import com.example.mmad.testapp.entity.UserEntity;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface UserSnapshotRepository extends JpaRepository<UserEntity, Long> {
+}