报错：Caused by org.springframework.beans.factory.BeanCreationException

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Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘transactionManager’ defined in class path resource [spring/spring-service.xml]: Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type ‘java.lang.String’ to required type ‘javax.sql.DataSource’ for property ‘dataSource’; nested exception is java.lang.IllegalStateException: Cannot convert value of type ‘java.lang.String’ to required type ‘javax.sql.DataSource’ for property ‘dataSource’: no matching editors or conversion strategy found

从上述报错中可以看出，是spring-service.xml中transactionManager错误，于是我们找spring-service.xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!--扫描service包下所有使用注解的类型-->
    <context:component-scan base-package="com.bc.o2o.service"/>

    <!--配置事务管理-->
    <bean id="transactionManager"
          class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" value="dataSource"/>
    </bean>

    <!--配置基于注解的声明式事务-->
    <tx:annotation-driven transaction-manager="transactionManager"/>
</beans>

从中可以发现，创建transactionManager的bean时，其中的dataSource错误，因为dataSource是引用类型，所以应该使用ref而不是value，于是将其更改为：

<bean id="transactionManager"
          class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

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