Polish source code.

spring-geode-autoconfigure/src/test/java/example/app/model/Author.java

@@ -41,7 +41,7 @@ public class Author {
 	private Long id;
 
 	@NonNull
-	private String name;
+	private final String name;
 
 	public boolean isNew() {
 		return getId() == null;

spring-geode-autoconfigure/src/test/java/example/app/model/Book.java

@@ -17,14 +17,14 @@ package example.app.model;
 
 import java.time.LocalDate;
 
-import lombok.Data;
-import lombok.NonNull;
-import lombok.RequiredArgsConstructor;
-
 import org.springframework.data.annotation.Id;
 import org.springframework.data.annotation.Transient;
 import org.springframework.data.gemfire.mapping.annotation.Region;
 
+import lombok.Data;
+import lombok.NonNull;
+import lombok.RequiredArgsConstructor;
+
 /**
  * The {@link Book} class is an Abstract Data Type (ADT) modeling a book.
  *
@@ -49,7 +49,7 @@ public class Book {
 	private LocalDate publishedDate;
 
 	@NonNull
-	private String title;
+	private final String title;
 
 	@Transient
 	public boolean isNew() {

spring-geode-autoconfigure/src/test/java/example/app/model/ISBN.java

@@ -13,7 +13,6 @@
  * or implied. See the License for the specific language governing
  * permissions and limitations under the License.
  */
-
 package example.app.model;
 
 import java.util.UUID;
@@ -48,7 +47,7 @@ public class ISBN implements Comparable<ISBN> {
 	}
 
 	public String getNumber() {
-		return number;
+		return this.number;
 	}
 
 	@Override