product-api: exceptions

Author: mama-samba-braima

src/main/java/com/amigoscode/exception/ErrorResponse.java

@@ -0,0 +1,13 @@
+package com.amigoscode.exception;
+
+import java.time.Instant;
+import java.util.Map;
+
+public record ErrorResponse(
+        String message,
+        String error,
+        int statusCode,
+        String path,
+        Instant timestamp,
+        Map<String, String> fieldErrors) {
+}

src/main/java/com/amigoscode/exception/GlobalExceptionHandler.java

@@ -0,0 +1,88 @@
+package com.amigoscode.exception;
+
+import jakarta.servlet.http.HttpServletRequest;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.validation.FieldError;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+
+import java.time.Instant;
+import java.util.Map;
+import java.util.Objects;
+import java.util.stream.Collectors;
+
+@ControllerAdvice
+public class GlobalExceptionHandler {
+
+    @ExceptionHandler(ResourceNotFound.class)
+    public ResponseEntity<ErrorResponse> handleResourceNotFound(
+            ResourceNotFound ex,
+            HttpServletRequest request
+    ) {
+        ErrorResponse errorResponse = new ErrorResponse(
+                ex.getMessage(),
+                HttpStatus.NOT_FOUND.getReasonPhrase(),
+                HttpStatus.NOT_FOUND.value(),
+                request.getRequestURI(),
+                Instant.now(),
+                null
+        );
+        return new ResponseEntity<>(
+                errorResponse,
+                HttpStatus.NOT_FOUND
+        );
+    }
+
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    public ResponseEntity<ErrorResponse> handleValidationException(
+            MethodArgumentNotValidException ex,
+            HttpServletRequest request
+    ) {
+
+        Map<String, String> errors = ex.getBindingResult()
+                .getFieldErrors()
+                .stream()
+                .collect(Collectors.toMap(
+                        FieldError::getField,
+                        fieldError ->
+                                Objects.requireNonNullElse(
+                                        fieldError.getDefaultMessage(),
+                                        "no error available"
+                                )
+                ));
+        ErrorResponse errorResponse = new ErrorResponse(
+                ex.getMessage(),
+                HttpStatus.BAD_REQUEST.getReasonPhrase(),
+                HttpStatus.BAD_REQUEST.value(),
+                request.getRequestURI(),
+                Instant.now(),
+                errors
+        );
+        return new ResponseEntity<>(
+                errorResponse,
+                HttpStatus.BAD_REQUEST
+        );
+    }
+
+    @ExceptionHandler(Exception.class)
+    public ResponseEntity<ErrorResponse> handleGenericException(
+            Exception ex,
+            HttpServletRequest request
+    ) {
+        ErrorResponse errorResponse = new ErrorResponse(
+                ex.getMessage(),
+                HttpStatus.INTERNAL_SERVER_ERROR.getReasonPhrase(),
+                HttpStatus.INTERNAL_SERVER_ERROR.value(),
+                request.getRequestURI(),
+                Instant.now(),
+                null
+        );
+        return new ResponseEntity<>(
+                errorResponse,
+                HttpStatus.INTERNAL_SERVER_ERROR
+        );
+    }
+
+}

src/main/java/com/amigoscode/exception/ResourceNotFound.java

@@ -1,9 +1,5 @@
 package com.amigoscode.exception;
 
-import org.springframework.http.HttpStatus;
-import org.springframework.web.bind.annotation.ResponseStatus;
-
-@ResponseStatus(HttpStatus.NOT_FOUND)
 public class ResourceNotFound extends RuntimeException {
     public ResourceNotFound(String message) {
         super(message);