Remove warning due serializartion without id.

src/main/java/koz01/java2/lab10/BaseEntity.java

@@ -15,6 +15,7 @@ import lombok.ToString;
 @ToString
 public class BaseEntity implements Serializable {
 
+	private static final long serialVersionUID = 1L;
 	@Getter
 	@Id
 	@GeneratedValue(strategy = GenerationType.AUTO)

src/main/java/koz01/java2/lab10/Clas.java

@@ -14,6 +14,8 @@ import lombok.Setter;
 @NoArgsConstructor
 public class Clas extends BaseEntity {
 
+	private static final long serialVersionUID = 1L;
+
 	@Getter
 	@Setter
 	private String cname;

src/main/java/koz01/java2/lab10/Department.java

@@ -16,6 +16,8 @@ import lombok.ToString;
 @NoArgsConstructor
 public class Department extends BaseEntity {
 
+	private static final long serialVersionUID = 1L;
+
 	@Getter
 	@Setter
 	private String name;

src/main/java/koz01/java2/lab10/Employee.java

@@ -14,6 +14,8 @@ import lombok.ToString;
 @NoArgsConstructor
 public class Employee extends BaseEntity {
 
+	private static final long serialVersionUID = 1L;
+
 	@Getter
 	@Setter
 	private String ename;

src/main/java/koz01/java2/lab10/NonTeachingStaff.java

@@ -9,6 +9,7 @@ import lombok.Setter;
 @NoArgsConstructor
 public class NonTeachingStaff extends Staff {
 
+	private static final long serialVersionUID = 1L;
 	@Getter
 	@Setter
 	private String areaexpertise;

src/main/java/koz01/java2/lab10/Staff.java

@@ -10,6 +10,7 @@ import lombok.Setter;
 public class Staff extends BaseEntity {
 
 
+	private static final long serialVersionUID = 1L;
 	@Getter
 	@Setter
 	private String sname;

src/main/java/koz01/java2/lab10/Teacher.java

@@ -15,6 +15,8 @@ import lombok.Setter;
 @NoArgsConstructor
 public class Teacher extends BaseEntity {
 
+	private static final long serialVersionUID = 1L;
+
 	@Getter
 	@Setter
 	private String tname;