No qualifying bean of type 'com.xxx' available: expected at least 1 bean which qualifies as autowire

报错信息"No qualifying bean of type 'com.xxx' available: expected at least 1 bean which qualifies as autowire candidate"表示没有符合自动装配条件的类型为'com.xxx'的bean可用。
根据报错信息中提到的入口方法"org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1356)"，我们可以看到问题出现在AServiceImpl的构造函数中，其中的最后一个入参是String类型。
解决该问题的方式有三种：
1. 使用@Autowired注解对属性或者方法进行Bean的注入。然而，从Spring 4.0开始，不再推荐使用属性注入模式，因为它会隐藏一些可能导致代码出错的隐患。
2. 使用@RequiredArgsConstructor(onConstructor =@_(@Autowired))注解，这样默认会通过@Autowired注入Bean。
3. 使用@RequiredArgsConstructor(onConstructor_={@Lazy})注解，对Bean进行懒加载处理。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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