ExceptionUtils i zbieranie messagów

PC30-SklepSpring/src/main/java/sklep/controller/ProductController.java

@@ -16,6 +16,7 @@ import org.springframework.web.bind.annotation.ResponseBody;
 import sklep.model.Product;
 import sklep.photo.PhotoUtil;
 import sklep.repository.ProductRepository;
+import sklep.utils.ExceptionUtils;
 
 @Controller
 @RequestMapping("/products")
@@ -80,7 +81,7 @@ public class ProductController {
 			System.out.println("Obiekt po zapisie: " + product.getProductId() + " " + product.getProductName());
 			model.addAttribute("saved", true);
 		} catch (Exception e) {
-			model.addAttribute("errors", List.of(e));
+			model.addAttribute("errors", ExceptionUtils.allMessages(e));
 		}
 		
 		return "product_form";

PC30-SklepSpring/src/main/java/sklep/utils/ExceptionUtils.java

+package sklep.utils;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ExceptionUtils {
+	
+	public static List<String> allMessages(Throwable e) {
+		List<String> messages = new ArrayList<>();
+		messages.add(oneMessage(e));
+		Throwable cause = e.getCause();
+		while(cause != null) {
+			messages.add(oneMessage(cause));
+			cause = cause.getCause();
+		}
+		return messages;
+	}
+
+	private static String oneMessage(Throwable e) {
+		return e.getClass().getSimpleName() + ": " + e.getMessage();
+	}
+}