java.lang.NoSuchFieldError: INSTANCE [英] java.lang.NoSuchFieldError: INSTANCE

问题描述

当我尝试通过 StormSubmitter 提交我的拓扑时，我得到 -

When trying to submit my topology through StormSubmitter, I am getting -

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

我使用的是 Spring.

I am using Spring.

我没有在 Spout/Bolt 构造函数中初始化 HttpClient.相反，它在 Bolt

I am not initializing HttpClient in Spout/Bolt Constructor. Instead its initialized in constructor of a class that is being fetched from Spring Context in prepare() method of bolt

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);
    }
}

推荐答案

这可能是一个依赖问题.

This is probably a dependency issue.

这是一条非常不清楚的错误消息，但我在这里发现了类似的内容:休眠 NoSuchFieldError INSTANCE 但仅使用 Struts 1?

It's a very unclear error message but I found something similar here: Hibernate NoSuchFieldError INSTANCE but only with Struts 1?

这篇关于java.lang.NoSuchFieldError: INSTANCE的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！