[BAEL-4847] Kafka SSL with Spring Boot client

spring-kafka/src/main/java/com/baeldung/kafka/ssl/KafkaConsumer.java

@@ -0,0 +1,25 @@
+package com.baeldung.kafka.ssl;
+
+import lombok.extern.slf4j.Slf4j;
+import org.apache.kafka.clients.consumer.ConsumerRecord;
+import org.springframework.kafka.annotation.KafkaListener;
+import org.springframework.stereotype.Component;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Component
+@Slf4j
+public class KafkaConsumer {
+
+    public static final String TOPIC = "test-topic";
+
+    public final List<String> messages = new ArrayList<>();
+
+    @KafkaListener(topics = TOPIC)
+    public void receive(ConsumerRecord<String, String> consumerRecord) {
+        log.info("Received payload: '{}'", consumerRecord.toString());
+        messages.add(consumerRecord.value());
+    }
+
+}

spring-kafka/src/main/java/com/baeldung/kafka/ssl/KafkaProducer.java

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+package com.baeldung.kafka.ssl;
+
+import lombok.AllArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.kafka.core.KafkaTemplate;
+import org.springframework.stereotype.Component;
+
+@Slf4j
+@AllArgsConstructor
+@Component
+public class KafkaProducer {
+
+    private final KafkaTemplate<String, String> kafkaTemplate;
+
+    public void sendMessage(String message, String topic) {
+        log.info("Producing message: {}", message);
+        kafkaTemplate.send(topic, "key", message)
+          .addCallback(
+            result -> log.info("Message sent to topic: {}", message),
+            ex -> log.error("Failed to send message", ex)
+          );
+    }
+}

spring-kafka/src/main/java/com/baeldung/kafka/ssl/KafkaSslApplication.java

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+package com.baeldung.kafka.ssl;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+@EnableAutoConfiguration
+public class KafkaSslApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(KafkaSslApplication.class, args);
+    }
+
+}