Hide Id fields from JSON data. Necessary?

Signed-off-by: Pekka Helenius <fincer89@hotmail.com>

bookstore/src/main/java/com/fjordtek/bookstore/model/Book.java

@@ -24,6 +24,7 @@ import javax.validation.constraints.NotBlank;
 import javax.validation.constraints.Pattern;
 import javax.validation.constraints.Size;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonManagedReference;
 import com.fjordtek.bookstore.annotation.CurrentYear;
 
@@ -73,6 +74,7 @@ public class Book {
 			name         = "bookIdGenerator",
 			sequenceName = "bookIdSequence"
 			)
+	@JsonIgnore
     private Long id;
 
 	////////////////////

bookstore/src/main/java/com/fjordtek/bookstore/model/Category.java

@@ -12,6 +12,7 @@ import javax.persistence.OneToMany;
 import javax.persistence.SequenceGenerator;
 
 import com.fasterxml.jackson.annotation.JsonBackReference;
+import com.fasterxml.jackson.annotation.JsonIgnore;
 
 @Entity
 public class Category {
@@ -27,6 +28,7 @@ public class Category {
 			name         = "categoryIdGenerator",
 			sequenceName = "categoryIdSequence"
 			)
+	@JsonIgnore
     private Long id;
 
 	////////////////////