expected single matching bean but found 2

阿新 • • 發佈：2017-11-01

scanner tac ebean col myba ram figure fin expressed

1 org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘accountAction‘: Unsatisfied dependency expressed through field ‘accountService‘; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type ‘com.xxx.IAccountService‘ available: expected single matching bean but found 2: accountServiceImpl,IAccountService

讓我很是疑惑，為什麽會產生這個錯誤。

查資料很多說是一個接口有兩個實現類，在引用的時候單純的使用Autowire就會出現上述錯誤。但是我看了一下項目中的代碼，沒有出現這種情況。

嘗試過很多次後，找到問題了,是因為MyBatis的MapperScannerConfigurer的配置引起的。

項目中出了MapperScannerConfigurer的包名掃描配置以外，還有一處Spring的配置， <context:component-scan base-package="com.xxx.yyy" />

MyBatis的MapperScannerConfigurer 的配置：

< 
bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
   <property name="basePackage" value="com.xxx.yyy" />
   <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
</bean>

修改為：

<context:component-scan base-package="com.xxx.yyy" />

<bean class 
="org.mybatis.spring.mapper.MapperScannerConfigurer">
   <property name="basePackage" value="com.xxx.yyy.**.dao" />
   <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
</bean>

解決問題。

跟了一下MapperScannerConfigurer 源代碼，MapperScannerConfigurer 會把配置的basePackage下面的mapper接口掃描到，並將他們註冊到spring容器中去。

如果配置的路徑範圍過大，spring base-package 和 mybatis basePackage 下面的bean會有重復註冊的現象，就會出現文章開頭的錯誤了。

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expected single matching bean but found 2

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