1.Added @notblank to the ISBN field in the Book DTO

 2.Removed @notblank from the role field in the Members DTO

src/main/java/com/libraryman_api/book/BookDto.java

@@ -14,6 +14,7 @@ public class BookDto {
     @Size(min = 1, max = 100, message = "Author name must be between 1 and 100 characters")
     private String author;
 
+    @NotBlank(message = "isbn is required")
     @Pattern(regexp = "^(978|979)-\\d{10}$", message = "Invalid ISBN format. Format must be '978-XXXXXXXXXX' or '979-XXXXXXXXXX'")
     private String isbn;
 

src/main/java/com/libraryman_api/member/dto/MembersDto.java

@@ -27,7 +27,7 @@ public class MembersDto {
             message = "Password must contain at least one letter, one number, and one special character")
     private String password;
 
-    @NotBlank(message = "Role is required")
+
     private Role role;
 
     private Date membershipDate;