added validation starter, added more validation annotations, and amen…

…ded http response

pom.xml

@@ -72,12 +72,10 @@
 			<version>4.23.1</version>
 		</dependency>
 		<dependency>
-			<groupId>org.hibernate.validator</groupId>
-			<artifactId>hibernate-validator</artifactId>
-			<version>8.0.1.Final</version>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-validation</artifactId>
 		</dependency>
 
-
 	</dependencies>
 
 	<build>

src/main/java/mate/academy/bookstore/dto/CreateBookRequestDto.java

@@ -1,17 +1,26 @@
 package mate.academy.bookstore.dto;
 
 import jakarta.validation.constraints.Min;
+import jakarta.validation.constraints.NotEmpty;
 import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Size;
 import java.math.BigDecimal;
 import lombok.Data;
+import org.hibernate.validator.constraints.ISBN;
 
 @Data
 public class CreateBookRequestDto {
     @NotNull
+    @NotEmpty
+    @Size(max = 255)
     private String title;
     @NotNull
+    @NotEmpty
+    @Size(max = 255)
     private String author;
     @NotNull
+    @NotEmpty
+    @ISBN
     private String isbn;
     @NotNull
     @Min(0)

src/main/java/mate/academy/bookstore/exceptions/CustomGlobalExceptionHandler.java

@@ -27,7 +27,7 @@ protected ResponseEntity<Object> handleMethodArgumentNotValid(
     ) {
         Map<String, Object> body = new LinkedHashMap<>();
         body.put("timestamp", LocalDateTime.now());
-        body.put("status", HttpStatus.BAD_REQUEST);
+        body.put("status", HttpStatus.UNPROCESSABLE_ENTITY);
         List<String> errors = ex.getBindingResult().getAllErrors().stream()
                         .map(this::getErrorMessage)
                         .toList();