Integrate Kafka Without Custom Configuration Class

pom.xml

@@ -27,6 +27,10 @@
                 </exclusion>
             </exclusions>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.kafka</groupId>
+            <artifactId>spring-kafka</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-log4j2</artifactId>

src/main/java/com/app/controller/KafkaProducerController.java

@@ -0,0 +1,22 @@
+package com.app.controller;
+
+import com.app.service.KafkaProducerService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/kafka")
+@RequiredArgsConstructor
+public class KafkaProducerController {
+
+    private final KafkaProducerService producerService;
+
+    @PostMapping("/publish")
+    public String publishMessage(@RequestParam("message") String message) {
+        producerService.sendMessage(message);
+        return "Message published successfully!";
+    }
+}

src/main/java/com/app/service/KafkaConsumerService.java

@@ -0,0 +1,5 @@
+package com.app.service;
+
+public interface KafkaConsumerService {
+    void listen(String message);
+}

src/main/java/com/app/service/KafkaConsumerServiceImpl.java

@@ -0,0 +1,14 @@
+package com.app.service;
+
+import org.springframework.kafka.annotation.KafkaListener;
+import org.springframework.stereotype.Service;
+
+@Service
+public class KafkaConsumerServiceImpl implements KafkaConsumerService {
+
+    @KafkaListener(topics = "test-topic", groupId = "test-group")
+    @Override
+    public void listen(String message) {
+        System.out.println("Received message: " + message);
+    }
+}

src/main/java/com/app/service/KafkaProducerService.java

@@ -0,0 +1,5 @@
+package com.app.service;
+
+public interface KafkaProducerService {
+    void sendMessage(String message);
+}

src/main/java/com/app/service/KafkaProducerServiceImpl.java

@@ -0,0 +1,18 @@
+package com.app.service;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.kafka.core.KafkaTemplate;
+import org.springframework.stereotype.Service;
+
+@Service
+@RequiredArgsConstructor
+public class KafkaProducerServiceImpl implements KafkaProducerService{
+
+    private final KafkaTemplate<String, String> kafkaTemplate;
+
+    private static final String TOPIC = "test-topic";
+
+    public void sendMessage(String message) {
+        kafkaTemplate.send(TOPIC, message);
+    }
+}

src/main/resources/application-local.yml

@@ -1,4 +1,30 @@
 app:
   logs:
     path: C:/${spring.application.name}/logs
+spring:
+  kafka:
+    bootstrap-servers: localhost:29092
+
+    # Producer Configuration
+    producer:
+      key-serializer: org.apache.kafka.common.serialization.StringSerializer
+      value-serializer: org.apache.kafka.common.serialization.StringSerializer
+      acks: 1                        # Acknowledgment level: 0, 1, or all
+      retries: 3                     # Retry count for sending messages
+      batch-size: 16384              # Batch size for producer messages
+      linger-ms: 1                   # Delay in milliseconds before sending a batch
+      buffer-memory: 33554432        # Total buffer memory for producer
+
+    # Consumer Configuration
+    consumer:
+      group-id: test-group           # Consumer group ID
+      auto-offset-reset: earliest    # Where to start reading messages (earliest/latest/none)
+      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
+      value-deserializer: org.apache.kafka.common.serialization.StringDeserializer
+      enable-auto-commit: true       # Automatically commit offsets
+      auto-commit-interval: 1000     # Interval in milliseconds to commit offsets
+
+    # Template Default Topic
+    template:
+      default-topic: test-topic      # Default topic for KafkaTemplate