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何时通过restful web服务保存数据和列表我接受此错误nullpointerexception ApiRestService.java

package com.twitterservice.service;
@RestController
public class ApiRestService {

    private static final Logger logger = LoggerFactory.getLogger(ApiRestService.class);

    @Autowired(required = true)
    ApiRepository ApiRepo;
    TwitterRepository TwitRepo;

    @RequestMapping(value = "/rest/twitterapi", method = RequestMethod.POST, produces = "application/json")
    @ResponseBody
    public ResponseEntity<ApiDomain> saveApiKeys(@RequestBody ApiDomain request) {
        ApiRepo.save(request);
        return new ResponseEntity<ApiDomain>(request, HttpStatus.OK);

    }

    @RequestMapping(value = "/rest/twitter", method = RequestMethod.GET)
    @SuppressWarnings("empty-statement")
    public Iterable<TwitterDomain> getAll() throws TwitterException {
        ApiDomain apikeys = ApiRepo.findOne(1L);
        ConfigurationBuilder xb = new ConfigurationBuilder();
        xb.setDebugEnabled(true)
                .setOAuthConsumerKey(apikeys.getConsumerKey())
                .setOAuthConsumerSecret(apikeys.getConsumerSecret())
                .setOAuthAccessToken(apikeys.getAccessToken())
                .setOAuthAccessTokenSecret(apikeys.getAccessTokenSecret());

        TwitterFactory tf = new TwitterFactory(xb.build());
        twitter4j.Twitter tw …