No qualifying bean of type 'com.yubai.el.ELConfig' available_no qualifying bean of type 'com.zaprk.service.user-优快云博客

本文链接：https://blog.youkuaiyun.com/expect521/article/details/76686623

本文介绍了一个关于 Spring 框架中 Bean 注入失败的问题及其解决方案。问题出现在尝试通过 AnnotationConfigApplicationContext 加载一个名为 ELConfig 的配置类时，由于配置方式错误导致系统无法识别该 Bean。文章详细解释了如何正确地指定配置类，并展示了修改后的代码。

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Aug 04, 2017 3:36:39 PM org.springframework.context.annotation.AnnotationConfigApplicationContext prepareRefresh

INFO: Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@49097b5d: startup date [Fri Aug 04 15:36:39 CST 2017]; root of context hierarchy

Exception in thread "main" org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.yubai.el.ELConfig' available

    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:353)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:340)
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1090)
    at com.yubai.el.Main.main(Main.java:9)

源代码：

package com.yubai.el;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class Main {
    public static void main(String[] args) {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext("ELConfig.class");

        ELConfig resourceService = context.getBean(ELConfig.class);
        resourceService.outputResource();
        context.close();
    }
}

出错原因：

从错误信息可知：没有此bean注入容器中，所以可能没有用@Service或者@Bean注入此类。还有可能是别的错误导致，如上错误。

AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(“ELConfig.class”);
AnnotationConfigApplicationContext作为spring容器，接收输入一个配置类作为参数。接收的类不要加双引号。

修改代码如下：

package com.yubai.el;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class Main {
    public static void main(String[] args) {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(ELConfig.class);

        ELConfig resourceService = context.getBean(ELConfig.class);
        resourceService.outputResource();
        context.close();
    }
}