java - RestClient 抛出 NullPointerException？

Question

我收到一个 NullpointerException 但我什至不明白怎么可能。我只是从其他类复制粘贴了 RestTemplate restTemplate = this.restClient.getRestTemplate() 部分，但在这里我收到一个 NullPointerException ？!

@Component
public class ShowRestClient implements ShowService{

@Autowired
private RestClient restClient;
@Override
public List<ShowDto> getShowsByPerformanceID(int perfID)
        throws ServiceException {
    // TODO Auto-generated method stub
    return null;
}
@Override
public List<ShowDto> findAllShows() throws ServiceException {

    RestTemplate restTemplate = this.restClient.getRestTemplate();(!!!!! HERE)
    String url = this.restClient.createServiceUrl("/show/");
    HttpEntity<String> entity = new HttpEntity<String>(this.restClient.getHttpHeaders());
    List<ShowDto> shows = null;
    try {
        ParameterizedTypeReference<List<ShowDto>> ref = new ParameterizedTypeReference<List<ShowDto>>() {};
        ResponseEntity<List<ShowDto>> response = restTemplate.exchange(URI.create(url), HttpMethod.GET, entity, ref);
        shows = response.getBody();
    } catch (RestClientException e) {
        throw new ServiceException("Could not retrieve shows: " + e.getMessage(), e);
    }
return shows;
}

Answer 1

您的 RestClient 似乎为 null ，很可能是因为 @Autowired 不起作用。我怀疑您的组件不是真正的 Spring Bean，因为如果它是，那么您的上下文创建将在应用程序启动期间失败。确保您已将包裹包含在包裹扫描中。