我尝试使用spring retry实现重试机制。然而，重试不起作用。我在主类中添加了@ EnableError annotation
下面是服务类的代码。我想在异常时重试getProductMetadata方法3次。异常是502错误。

import com.google.gson.Gson;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.retry.annotation.Backoff;
import org.springframework.retry.annotation.EnableRetry;
import org.springframework.retry.annotation.Recover;
import org.springframework.retry.annotation.Retryable;
import org.springframework.stereotype.Service;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.client.RestTemplate;
@Service
@Slf4j
public class ProductService {
    
    
    private String productInfoBaseUrl = "http://localhost";
    @Value("${service.product.metadata}")
    private String productInfoPathProductMetadata;
    private static final Logger logger = LoggerFactory.getLogger(ProductService.class);
    @Autowired
    RestTemplate restTemplate;
    int count = 0;
    @Retryable(retryFor = Exception.class, maxAttempts = 5, backoff = @Backoff(delay = 100))
    public ProductResponse getProductMetadata(String sku, HandlerResult handlerResult) {
        
        HttpHeaders headers = new HttpHeaders();
        headers.add(HttpHeaders.CONTENT_TYPE, "application/json");
        String errorMsg;
        String endpoint = getProductFetchMetadataEndpoint();
        ResponseEntity<String> response;
        try {
            response = restTemplate.getForEntity(endpoint, String.class);
        } catch (Exception ex) {
            errorMsg = "getProductMetadata for sku: " + sku + " threw exception: " + ex.getMessage();
            //log.info(errorMsg);
            HandlerResult.updateStatus(handlerResult, errorMsg, false);
            logger.info(++count + " Call attempts were made");
            return null;
        }
        ProductResponse metadataResponse;
        Gson gson = new Gson();
        try {
            metadataResponse = gson.fromJson(response.getBody(), ProductResponse.class);
        } catch (Exception e) {
            errorMsg = String.format("Exception ProductResponse converting %s to map", response.getBody());
            log.info(errorMsg);
            HandlerResult.updateStatus(handlerResult, errorMsg, false);
            return null;
        }
        
        return metadataResponse;
    }
    private String getProductFetchMetadataEndpoint() {
        return productInfoBaseUrl + "/" + productInfoPathProductMetadata + "/";
    }
}

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有人能告诉我我错过了什么吗？