feat: Added exception handling for rest-api

application/src/main/java/com/techivw/webprice/application/exceptions/NotFoundException.java

@@ -0,0 +1,8 @@
+package com.techivw.webprice.application.exceptions;
+
+public class NotFoundException extends RuntimeException {
+
+    public NotFoundException(String message) {
+        super(message);
+    }
+}

application/src/main/java/com/techivw/webprice/application/services/PriceService.java

@@ -1,5 +1,6 @@
 package com.techivw.webprice.application.services;
 
+import com.techivw.webprice.application.exceptions.NotFoundException;
 import com.techivw.webprice.application.ports.in.PriceServicePort;
 import com.techivw.webprice.application.ports.out.PriceRepositoryPort;
 import com.techivw.webprice.domain.Price;
@@ -16,6 +17,9 @@ public class PriceService implements PriceServicePort {
 
     @Override
     public Price getPriceWithHighestPriorityByDateTimeAndProductIdAndBrandId(LocalDateTime dateTime, Long productId, Long brandId) {
-        return priceRepositoryPort.findHighestPriorityPriceByDateTimeAndProductIdAndBrandId(dateTime, productId, brandId).orElse(null);
+        return priceRepositoryPort.findHighestPriorityPriceByDateTimeAndProductIdAndBrandId(dateTime, productId, brandId)
+                .orElseThrow(() ->
+                        new NotFoundException(String.format(
+                                "Price for product %d of brand %d not found for date %s", productId, brandId, dateTime)));
     }
 }

infrastructure/in/rest-api/src/main/java/com/techivw/webprice/infrastructure/in/controllers/adapters/PriceControllerAdapter.java

@@ -3,6 +3,7 @@ package com.techivw.webprice.infrastructure.in.controllers.adapters;
 import com.techivw.webprice.application.ports.in.PriceServicePort;
 import com.techivw.webprice.domain.Price;
 import com.techivw.webprice.infrastructure.in.controllers.model.PriceResponse;
+import com.techivw.webprice.infrastructure.in.controllers.model.mappers.PriceResponseMapper;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.Parameter;
 import io.swagger.v3.oas.annotations.media.Content;
@@ -35,8 +36,8 @@ public class PriceControllerAdapter {
             description = "Price information found",
             content = @Content(mediaType = "application/json", schema = @Schema(implementation = PriceResponse.class))
     )
-    @ApiResponse(responseCode = "404", description = "Price information not found for the given parameters")
     @ApiResponse(responseCode = "400", description = "Invalid request parameters")
+    @ApiResponse(responseCode = "404", description = "Price information not found for the given parameters")
     public ResponseEntity<PriceResponse> getPrice(
             @Parameter(description = "Date and time for price lookup (ISO format)", example = "2025-04-30T12:00:00")
             @RequestParam(name = "dateTime") @DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME) LocalDateTime dateTime,
@@ -46,14 +47,6 @@ public class PriceControllerAdapter {
             @RequestParam(name = "brandId")  Long brandId) {
 
         Price price = priceServicePort.getPriceWithHighestPriorityByDateTimeAndProductIdAndBrandId(dateTime, productId, brandId);
-        PriceResponse priceResponse = PriceResponse.builder()
+        return ResponseEntity.ok(PriceResponseMapper.fromPrice(price));
-                .productId(price.getProductId())
-                .brandId(price.getBrandId())
-                .priceList(price.getPriceList())
-                .startDate(price.getStartDate())
-                .endDate(price.getEndDate())
-                .price(price.getPrice())
-                .build();
-        return ResponseEntity.ok(priceResponse);
     }
 }

infrastructure/in/rest-api/src/main/java/com/techivw/webprice/infrastructure/in/controllers/handlers/AdapterExceptionHandler.java

@@ -0,0 +1,27 @@
+package com.techivw.webprice.infrastructure.in.controllers.handlers;
+
+import com.techivw.webprice.application.exceptions.NotFoundException;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+import java.util.Date;
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.springframework.http.HttpStatus.NOT_FOUND;
+
+@RestControllerAdvice
+public class AdapterExceptionHandler {
+
+    @ExceptionHandler(NotFoundException.class)
+    public ResponseEntity<Map<String, Object>> handleNotFoundException(NotFoundException ex) {
+        Map<String, Object> body = new HashMap<>();
+        body.put("timestamp", new Date());
+        body.put("status", NOT_FOUND.value());
+        body.put("error", "Not Found");
+        body.put("message", ex.getMessage());
+
+        return new ResponseEntity<>(body, NOT_FOUND);
+    }
+}

infrastructure/in/rest-api/src/main/java/com/techivw/webprice/infrastructure/in/controllers/model/mappers/PriceResponseMapper.java

@@ -0,0 +1,18 @@
+package com.techivw.webprice.infrastructure.in.controllers.model.mappers;
+
+import com.techivw.webprice.domain.Price;
+import com.techivw.webprice.infrastructure.in.controllers.model.PriceResponse;
+
+public class PriceResponseMapper {
+
+    public static PriceResponse fromPrice(Price price) {
+        return PriceResponse.builder()
+                .productId(price.getProductId())
+                .brandId(price.getBrandId())
+                .priceList(price.getPriceList())
+                .startDate(price.getStartDate())
+                .endDate(price.getEndDate())
+                .price(price.getPrice())
+                .build();
+    }
+}