MyBatis异常 之 Mapped Statements collection does not contain value for xxx

背景

执行mybatis mapper中的一个方法时报错：

1java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for com.xxx.mapper.SysDictionaryMapper.findByTypeCode
2	org.apache.ibatis.session.Configuration$StrictMap.get(Configuration.java:672)
3	org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:507)
4	org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:500)
5	org.apache.ibatis.binding.MapperMethod.setupCommandType(MapperMethod.java:240)

分析

查看SysDictionaryMapper.findByTypeCode是否存在：

1	SysDictionaryMapper.java
2		List<SysDictionaryDO> findByTypeCode(@Param("typeCode") String typeCode);
3
4	SysDictionaryMapper.xml
5		<select id="findByTypeCode" resultMap="BaseResultMap">
6			SELECT <include refid="baseColumn"/>
7			FROM <include refid="tableName"/>
8			WHERE type_code = #{typeCode} and del_status = 0
9			ORDER BY sort
10		</select>

查看配置：

1	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
2		<property name="dataSource" ref="dataSource" />
3		<property name="configLocation" value="classpath:mybatis-config.xml" />
4		<property name="mapperLocations" value="classpath:mapper/*Mapper.xml" />
5		<property name="plugins">
6			<array>
7				<bean class="com.xxx.interceptor.MapInterceptor"/>
8				<bean class="com.xxx.interceptor.ParamterInterceptor"/>
9			</array>
10		</property>
11	</bean>

通过分析发现，SysDictionaryMapper.xml并不是在mapper目录下，而是在其子目录下，所以导致找不到该mapper文件；

解决方案

修改配置

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

mapper/**/*Mapper.xml表示包含目录及其子目录下的所有mapper文件