org.springframework.context.annotation.AnnotationConfigApplicationContext has not been refreshed yet

代码如下（为了演示这个报错）：

AnnotationConfigApplicationContext annotationConfigApplicationContext = new AnnotationConfigApplicationContext();
annotationConfigApplicationContext.getBean("xxx");

报错如下：

Exception in thread "main" java.lang.IllegalStateException: org.springframework.context.annotation.AnnotationConfigApplicationContext@20ad9418 has not been refreshed yetat org.springframework.context.support.AbstractApplicationContext.assertBeanFactoryActive(AbstractApplicationContext.java:1032)at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1044)at com.turnx7.spring.iocbyanotation.test.Test.main(Test.java:18)

在使用spring框架使用IOC获取bean时有时可能会碰到这个错误

AnnotationConfigApplicationContext ad has not been refreshed yet

看起来似乎是annotationConfigApplicationContext未刷新的问题，但事实并不是，在添加annotationConfigApplicationContext.refresh();语句后将会出现新的错误

org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'defaultCache' available

其实这个问题的本质是beans配置文件并未加载，导致annotationConfigApplicationContext无法获取任何bean信息

解决方法就是在annotationConfigApplicationContext声明时添加配置文件，

AnnotationConfigApplicationContext annotationConfigApplicationContext= new AnnotationConfigApplicationContext(SpringConfig.class);

或者将配置类注册到AnnotationConfigApplicationContext中：

AnnotationConfigApplicationContext annotationConfigApplicationContext = new AnnotationConfigApplicationContext();
annotationConfigApplicationContext.register(SpringConfig.class);
annotationConfigApplicationContext.refresh();

注意是添加Class，即配置类对象

如果是XML方式，则在ClassPathXMLApplicationContext的实例添加XML配置文件即可

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