nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeEx

1、环境mybaties：

配置映射运行时出现：nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias ‘VARCHAR‘.  Cause: java.lang.ClassNotFoundException: Cannot find class: VARCHAR

2、仔细检查了十几分钟，才发现映射配置错误；

改前：

<result column="FILE_ID" javaType="VARCHAR" property="fileId"/>

改后：

<result column="FILE_ID" jdbcType="VARCHAR" property="fileId"/>


3、牵扯出下面两者的区别

javaType：表示的实体类中字段的类别

jdbcType：表示的数据库表中的字段类别；