【String入门】Spring类的完整生命周期及后处理Beand的报错问题

Question

报错异常信息：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'customerService' defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is org.springframework.beans.factory.support.BeanDefinitionValidationException: Couldn't find an init method named 'setup' on bean with name 'customerService'