implemented fetch qr code scanned details

src/main/java/com/safeqr/app/exceptions/ErrorResponse.java

@@ -0,0 +1,16 @@
+package com.safeqr.app.exceptions;
+
+import lombok.Builder;
+import lombok.Data;
+
+@Builder
+@Data
+public class ErrorResponse {
+    private String error;
+    private int status;
+
+    public ErrorResponse(String message, int status){
+        this.error = message;
+        this.status = status;
+    }
+}

src/main/java/com/safeqr/app/exceptions/GlobalExceptionHandler.java

@@ -0,0 +1,15 @@
+package com.safeqr.app.exceptions;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+
+@ControllerAdvice
+public class GlobalExceptionHandler {
+
+    @ExceptionHandler(QRCodeExceptions.class)
+    public ResponseEntity<ErrorResponse> handleQRCodeNotFoundException(QRCodeExceptions e) {
+        return new ResponseEntity<>(new ErrorResponse(e.getMessage(), HttpStatus.NOT_FOUND.value()), HttpStatus.NOT_FOUND);
+    }
+}

src/main/java/com/safeqr/app/exceptions/QRCodeExceptions.java

@@ -0,0 +1,7 @@
+package com.safeqr.app.exceptions;
+
+public class QRCodeExceptions extends RuntimeException {
+    public QRCodeExceptions(String message){
+        super(message);
+    }
+}