NoSuchBeanDefinitionException: No bean named 解决

Exception in thread "main" org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'a' available
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:805)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:1278)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:297)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:207)
	at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1114)
	at com.test.demo.Test.main(Test.java:21)

解决办法:

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