output: #fixed code
                                  protected void checkProviderInfo(ProviderGroup providerGroup) {
          List<ProviderInfo> providerInfos = providerGroup == null ? null : providerGroup.getProviderInfos();
          if (CommonUtils.isEmpty(providerInfos)) {
              return;
          }
          Iterator<ProviderInfo> iterator = providerInfos.iterator();
          while (iterator.hasNext()) {
              ProviderInfo providerInfo = iterator.next();
              if (!StringUtils.equals(providerInfo.getProtocolType(), consumerConfig.getProtocol())) {
                  if (LOGGER.isWarnEnabled(consumerConfig.getAppName())) {
                      LOGGER.warnWithApp(consumerConfig.getAppName(),
                          "Unmatched protocol between consumer [{}] and provider [{}].",
                          consumerConfig.getProtocol(), providerInfo.getProtocolType());
                  }
              }
          }
      }
input: #vulnerable code 
                                  protected void checkProviderInfo(ProviderGroup providerGroup) {
          List<ProviderInfo> providerInfos = providerGroup == null ? null : providerGroup.getProviderInfos();
          if (CommonUtils.isEmpty(providerInfos)) {
              return;
          }
          Iterator<ProviderInfo> iterator = providerInfos.iterator();
          while (iterator.hasNext()) {
              ProviderInfo providerInfo = iterator.next();
              if (!StringUtils.equals(providerInfo.getProtocolType(), consumerConfig.getProtocol())) {
                  if (LOGGER.isWarnEnabled(consumerConfig.getAppName())) {
                      LOGGER.warnWithApp(consumerConfig.getAppName(),
                          "Unmatched protocol between consumer [{}] and provider [{}].",
                          consumerConfig.getProtocol(), providerInfo.getProtocolType());
                  }
              }
              if (StringUtils.isEmpty(providerInfo.getSerializationType())) {
                  providerInfo.setSerializationType(consumerConfig.getSerialization());
              }
          }
      } 
                              #location 17 
                              #vulnerability type THREAD_SAFETY_VIOLATION