java.lang.NoSuchFieldError : INSTANCE

Question

当尝试通过 StormSubmitter 提交我的拓扑时，我得到 -

Caused by: java.lang.NoSuchFieldError: INSTANCE  
at org.apache.http.impl.io.DefaultHttpRequestWriterFactory.<init>(DefaultHttpRequestWriterFactory.java:52)

我正在使用 Spring。

我没有在 Spout/Bolt 构造函数中初始化 HttpClient。相反，它在一个类的构造函数中初始化，该类在 prepare() 的 Bolt 方法中从 Spring 上下文中获取

代码结构如下-

SomeBolt.java

@Component
public class SomeBolt extends BaseRichBolt {
    private OutputCollector _collector;
    private SomeClient someClient;

    @Override
    public void prepare(Map conf, TopologyContext context, OutputCollector collector) {
        _collector = collector;
        someClient = AppContext.getBean(SomeClient.class);
    }
}

SomeClient.java

@Component
public class SomeClient {
    private final CloseableHttpClient httpClient;

    public SomeClient() {
        this.httpClient = (httpClient == null ? HttpClients.createDefault() : httpClient);
    }
}

AppContext.java

@Component
public class AppContext implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        AppContext.applicationContext = applicationContext;
    }

    public static <T> T getBean(Class<T> c) {
        return applicationContext.getBean(c);
    }
}

Answer 1

这可能是一个依赖问题。

这是一个非常不清楚的错误消息，但我在这里发现了类似的内容: Hibernate NoSuchFieldError INSTANCE but only with Struts 1?