Java Spring Social Twitter-取消引用Twitter对象时的NPE

我使用Spring社交推特v。1.1.0.M4。我成功地启用了与Twitter的内存连接。现在我正在努力保持这些联系。我的数据库连接和日志记录似乎工作正常，因为用户已通过身份验证，我可以看到他们的twitter登录。问题是，我无法访问他们的任何详细信息（粗花呢、跟随等）。我在控制器中显示用户推文的代码是：

@Autowired
private Twitter twitter;

@Autowired
private TwitterConnectionUtils twitterConnectionUtils;

@Autowired
private SessionBean sessionBean;

@RequestMapping("/")
public String index(Model model) {
    logger.warning("index");
    model.addAttribute("sessionBean", sessionBean);
    List<Tweet> tweets = new ArrayList<Tweet>();

    try {
        if (!twitterConnectionUtils.isConnectedToTwitter()) {
            return "index";
        }
        tweets.addAll(twitter.timelineOperations().getHomeTimeline());
    } catch (Exception e) {
        logger.warning(ExceptionUtils.getStackTrace(e));
        model.addAttribute("exception", e.toString());
        return "index";
    }

    model.addAttribute("tweets", tweets);
    return "twitter/tweets";
}

你知道是什么导致了这个问题吗？我还提供了库的javaconfig，以供参考：

@Configuration
@EnableTwitter(appId="myAppId", appSecret="myAppSecret")
public class TwitterConfig {

    @Autowired
    private TwitterConnectInterceptor twitterConnectInterceptor;

    @Inject
    private DataSource dataSource;

    @Inject
    private Environment environment;

    @Bean
    public UserIdSource userIdSource() {
        return new UserIdSource() {         
            @Override
            public String getUserId() {
                return "myTestingPurposesLogin"; // TODO change to security-obtained user login
            }
        };
    }

    @Bean
    public ConnectController connectController() {
        CustomConnectController connectionController = 
                new CustomConnectController(connectionFactoryLocator(), connectionRepository());
        connectionController.addInterceptor(twitterConnectInterceptor);
        return connectionController;
    }

    @Bean
    public ConnectionFactoryLocator connectionFactoryLocator() {
        ConnectionFactoryRegistry registry = new ConnectionFactoryRegistry();

        registry.addConnectionFactory(new TwitterConnectionFactory(
                "myAppId", "myAppSecret"));

        return registry;
    }

    @Bean
    @Scope(value="request", proxyMode=ScopedProxyMode.INTERFACES)
    public ConnectionRepository connectionRepository() {
        Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
        if (authentication == null) {
            throw new IllegalStateException("Unable to get a ConnectionRepository: no user signed in");
        }
        return usersConnectionRepository().createConnectionRepository(authentication.getName());
    }

    @Bean
    public UsersConnectionRepository usersConnectionRepository() {
        return new JdbcUsersConnectionRepository(dataSource, connectionFactoryLocator(), 
            textEncryptor());
    }

    @Bean
    public TextEncryptor textEncryptor() {
        return Encryptors.noOpText();
    }

}

改变

例如（伪代码，我不知道返回的所有类型）：

---

这将告诉您哪个方法调用没有返回对象。

好吧，我完全错了！下面是一个易于遵循的工作示例：

@Configuration
@EnableTwitter(appId="myAppId", appSecret="myAppSecret")
@EnableJdbcConnectionRepository
public class TwitterConfig {

    @Autowired
    private TwitterConnectInterceptor twitterConnectInterceptor;

    @Bean
    public UserIdSource userIdSource() {
        return new UserIdSource() {         
            @Override
            public String getUserId() {
                return "myTestingPurposesLogin";
            }
        };
    }

    @Bean
    public ConnectController connectController(ConnectionFactoryLocator connectionFactoryLocator, ConnectionRepository connectionRepository) {
        CustomConnectController connectionController = new CustomConnectController(connectionFactoryLocator, connectionRepository);
        connectionController.addInterceptor(twitterConnectInterceptor);
            return connectionController;
    }

    @Bean
    public TextEncryptor textEncryptor() {
        return Encryptors.noOpText();
    }

}

---

@EnableJdbcConnectionRepository

注释对于让我走上正确的道路至关重要。

这些注释中没有一个是

null

（技术上很可能）。问题在于某些方面。不，您可以使用带有代理的AOP将建议应用于某些连接点。在处理过程中失败了。Robert，你的代码将在第一行抛出异常。正如我所说的，任何对twitter的取消引用都会在一些内部代理中导致NPE。您有任何自定义方面吗？做任何AOP？不，我没有明确做任何AOP。

tweets.addAll(twitter.timelineOperations().getHomeTimeline());

var timelineOperations = twitter.TimelineOperations();
var homeTimeline = timelineOperations.GetHomeTimeline();
tweets.addAll(homeTimeline);

@Configuration
@EnableTwitter(appId="myAppId", appSecret="myAppSecret")
@EnableJdbcConnectionRepository
public class TwitterConfig {

    @Autowired
    private TwitterConnectInterceptor twitterConnectInterceptor;

    @Bean
    public UserIdSource userIdSource() {
        return new UserIdSource() {         
            @Override
            public String getUserId() {
                return "myTestingPurposesLogin";
            }
        };
    }

    @Bean
    public ConnectController connectController(ConnectionFactoryLocator connectionFactoryLocator, ConnectionRepository connectionRepository) {
        CustomConnectController connectionController = new CustomConnectController(connectionFactoryLocator, connectionRepository);
        connectionController.addInterceptor(twitterConnectInterceptor);
            return connectionController;
    }

    @Bean
    public TextEncryptor textEncryptor() {
        return Encryptors.noOpText();
    }

}