今天遇到一個很傻逼的問題，在一個功能點的mapper里插入以下代碼后，另一個平行功能點報錯，報錯信息如下：
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
一時間把我和我的小伙伴整蒙了，沒辦法我只能硬着頭皮分析
之后根據異常的嵌套關系，我定位到實際引發錯誤的是以下語句：java.lang.IllegalStateException: No typehandler found for property trainingUrls，並且產生bug的文件為[C:\Users\99043\Desktop\yunong-cloud\yunong-gap-common\target\classes\mapper\TbEmployeeTrainingRecordMapper.xml]。發現的確是trainingUrls字段在添加時出現了紕漏：
於是我改為CHAR類型后點擊debug，兩手一攤准備抖jio，卻不想問題並沒有解決：
顯然，盡管我把trainingUrls字段的jdbcType改成了"CHAR"，還並不能解決問題，那就肯定是Dto出了問題，果然，修改一下：
問題解決。
