Mybatis: Mapped Statements collection already contains value(解决方法)

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在使用Mybatis跟数据库进行交互时出现如下错误：

注意这两句话：Mapped Statements collection already contains value（映射语句集合已包含值），please check com/zjx/dao/BookMapper.xml

然后我们去看BookMapper

<mapper namespace="com.zjx.dao.BookMapper"><insert id="addBook" parameterType="Book">insert into books(bookName, bookCounts, detail)values (#{bookName}, #{bookCounts}, #{detail})</insert><delete id="deleteByID" parameterType="_int">DELETE FROM books WHERE bookID = #{id};</delete><update id="updateBy" parameterType="Book">update books<set><if test="bookName != null">set bookName = #{book.bookName}</if><if test="bookCounts != null">set bookCounts = #{book.bookCounts}</if><if test="detail != null">set detail = #{book.detail}</if></set>where bookID = #{book.bookID}</update><select id="queryForOneByID" resultType="Book">select * from books where bookID = #{id}</select><select id="queryForAll" resultType="Book">select * from books</select>
</mapper>

这里面根本没有重复的属性呀

于是乎，百度到我的applicationContext.xml中既配置了configLocation，又配置了mapperLocations,如下：

    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"><!-- 注入连接池给 sqlsessionFactory 的属性 dataSource 赋值ref="引用该 spring容器 中的另一个 bean的id"--><property name="dataSource" ref="dataSource"/><!--指定mybatis的全局配置文件--><property name="configLocation" value="classpath:mybatis-config.xml"/><!--指定mybatis，mapper文件的位置--><property name="mapperLocations" value="classpath:com/zjx/dao/*.xml"/></bean>

然后，我把mapperLocations去掉，tomcat就成功跑起来

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