Polish

spring-boot-samples/spring-boot-sample-kafka/src/main/java/sample/kafka/Consumer.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package sample.kafka;
 
 import org.springframework.kafka.annotation.KafkaListener;
@@ -26,4 +27,4 @@ class Consumer {
 		System.out.println("Received sample message [" + message + "]");
 	}
 
-}
+}

spring-boot-samples/spring-boot-sample-kafka/src/main/java/sample/kafka/Producer.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package sample.kafka;
 
 import org.springframework.kafka.core.KafkaTemplate;
@@ -32,4 +33,4 @@ public class Producer {
 		System.out.println("Sent sample message [" + message + "]");
 	}
 
-}
+}

spring-boot-samples/spring-boot-sample-kafka/src/main/java/sample/kafka/SampleKafkaApplication.java

@@ -13,12 +13,12 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package sample.kafka;
 
 import org.springframework.boot.ApplicationRunner;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
-import org.springframework.boot.builder.SpringApplicationBuilder;
 import org.springframework.context.annotation.Bean;
 
 @SpringBootApplication

spring-boot-samples/spring-boot-sample-kafka/src/main/java/sample/kafka/SampleMessage.java

@@ -41,11 +41,7 @@ public class SampleMessage {
 
 	@Override
 	public String toString() {
-		final StringBuilder sb = new StringBuilder("SampleMessage{");
-		sb.append("id=").append(this.id);
-		sb.append(", message='").append(this.message).append('\'');
-		sb.append('}');
-		return sb.toString();
+		return "SampleMessage{id=" + this.id + ", message='" + this.message + "'}";
 	}
 
 }