原因就是byType类型只能是is-a的关系
Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'com.bjpowernodeyushuxingPrimarySchool.School' available: expected single matching bean but found 2: school,mySchool2Caused by: org.springframe
阅读背景：
Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'com.bjpowernodeyushuxingPrimarySchool.School' available: expected single matching bean but fou
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