added log tracing classes

src/main/java/com/billpaymentservice/bbps/exception/GlobalExceptionHandler.java

@@ -2,16 +2,41 @@ package com.billpaymentservice.bbps.exception;
 
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.MethodArgumentNotValidException;
 import org.springframework.web.bind.annotation.ControllerAdvice;
 import org.springframework.web.bind.annotation.ExceptionHandler;
-import com.billpaymentservice.bbps.dto.GeneralResp;
+
 import com.billpaymentservice.bbps.dto.ResponseModel;
 
+import java.util.HashMap;
+import java.util.Map;
+
 @ControllerAdvice
 public class GlobalExceptionHandler {
 
+    // ✅ Handle CustomException
     @ExceptionHandler(CustomException.class)
-    public ResponseEntity<ResponseModel> handleCustomException(CustomException ex) {
+    public ResponseEntity<ResponseModel<?>> handleCustomException(CustomException ex) {
         return new ResponseEntity<>(ex.getResponseModel(), HttpStatus.BAD_REQUEST);
     }
-}
+
+    // ✅ Handle validation errors
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    public ResponseEntity<ResponseModel<?>> handleValidationExceptions(MethodArgumentNotValidException ex) {
+
+        Map<String, String> errors = new HashMap<>();
+
+        ex.getBindingResult().getFieldErrors().forEach(error -> {
+            errors.put(error.getField(), error.getDefaultMessage());
+        });
+
+        ResponseModel<?> response = new ResponseModel<>(
+                "Validation Failed",
+                "FAILED",
+                HttpStatus.BAD_REQUEST.value(),
+                errors
+        );
+
+        return new ResponseEntity<>(response, HttpStatus.BAD_REQUEST);
+    }
+}