今天遇到一个很傻逼的问题，在一个功能点的mapper里插入以下代码后，另一个平行功能点报错，报错信息如下：
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'BaseattachBusiness': Unsatisfied dependency expressed through field 'tbBaseAttachService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'TbBaseAttachService': Unsatisfied dependency expressed through field 'tbBaseAttachMapper'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'tbBaseAttachMapper' defined in file [C:\Users\99043\Desktop\yunong-cloud\yunong-gap-common\target\classes\com\yun\cloud\gap\dao\TbBaseAttachMapper.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [C:\Users\99043\Desktop\yunong-cloud\yunong-gap-common\target\classes\mapper\TbEmployeeTrainingRecordMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: java.lang.IllegalStateException: No typehandler found for property trainingUrls
一时间把我和我的小伙伴整蒙了，没办法我只能硬着头皮分析
之后根据异常的嵌套关系，我定位到实际引发错误的是以下语句：java.lang.IllegalStateException: No typehandler found for property trainingUrls，并且产生bug的文件为[C:\Users\99043\Desktop\yunong-cloud\yunong-gap-common\target\classes\mapper\TbEmployeeTrainingRecordMapper.xml]。发现的确是trainingUrls字段在添加时出现了纰漏：
于是我改为CHAR类型后点击debug，两手一摊准备抖jio，却不想问题并没有解决：
显然，尽管我把trainingUrls字段的jdbcType改成了"CHAR"，还并不能解决问题，那就肯定是Dto出了问题，果然，修改一下：
问题解决。
