removing Serializable because it creates a lot of warnings

App should be as simple as possible for beginners

src/main/java/org/springframework/samples/petclinic/model/BaseEntity.java

@@ -15,6 +15,8 @@
  */
 package org.springframework.samples.petclinic.model;
 
+import java.io.Serializable;
+
 import javax.persistence.GeneratedValue;
 import javax.persistence.GenerationType;
 import javax.persistence.Id;
@@ -27,7 +29,7 @@ import javax.persistence.MappedSuperclass;
  * @author Juergen Hoeller
  */
 @MappedSuperclass
-public class BaseEntity implements Serializable {
+public class BaseEntity {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     protected Integer id;