MyBatis異常 之 Mapped Statements collection does not contain value for xxx 原

背景

執行mybatis mapper中的一個方法時報錯：

java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for com.xxx.mapper.SysDictionaryMapper.findByTypeCode
	org.apache.ibatis.session.Configuration$StrictMap.get(Configuration.java:672)
	org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:507)
	org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:500)
	org.apache.ibatis.binding.MapperMethod.setupCommandType(MapperMethod.java:240)

分析

查看SysDictionaryMapper.findByTypeCode是否存在：

	SysDictionaryMapper.java
		List<SysDictionaryDO> findByTypeCode(@Param("typeCode") String typeCode);

	SysDictionaryMapper.xml
		<select id="findByTypeCode" resultMap="BaseResultMap">
			SELECT <include refid="baseColumn"/>
			FROM <include refid="tableName"/>
			WHERE type_code = #{typeCode} and del_status = 0
			ORDER BY sort
		</select>

查看配置：

	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<property name="dataSource" ref="dataSource" />
		<property name="configLocation" value="classpath:mybatis-config.xml" />
		<property name="mapperLocations" value="classpath:mapper/*Mapper.xml" />
		<property name="plugins">
			<array>
				<bean class="com.xxx.interceptor.MapInterceptor"/>
				<bean class="com.xxx.interceptor.ParamterInterceptor"/>
			</array>
		</property>
	</bean>

通過分析發現，SysDictionaryMapper.xml並不是在mapper目錄下，而是在其子目錄下，所以導致找不到該mapper文件；

解決方案

修改配置

<property name="mapperLocations" value="classpath:mapper/**/*Mapper.xml" />

mapper/**/*Mapper.xml表示包含目錄及其子目錄下的所有mapper文件