org.apache.ibatis.type.TypeException: Could not resolve type alias 'BIGINT'

异常

Caused by: org.apache.ibatis.type.TypeException: Could not resolve type alias 'BIGINT'.  Cause: java.lang.ClassNotFoundException: Cannot find class: BIGINT
    at org.apache.ibatis.type.TypeAliasRegistry.resolveAlias(TypeAliasRegistry.java:120) ~[mybatis-3.4.4.jar:3.4.4]
    at org.apache.ibatis.builder.BaseBuilder.resolveAlias(BaseBuilder.java:149) ~[mybatis-3.4.4.jar:3.4.4]
    at org.apache.ibatis.builder.BaseBuilder.resolveClass(BaseBuilder.java:116) ~[mybatis-3.4.4.jar:3.4.4]
    ... 81 common frames omitted
Caused by: java.lang.ClassNotFoundException: Cannot find class: BIGINT
    at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:200) ~[mybatis-3.4.4.jar:3.4.4]
    at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:89) ~[mybatis-3.4.4.jar:3.4.4]
    at org.apache.ibatis.io.Resources.classForName(Resources.java:261) ~[mybatis-3.4.4.jar:3.4.4]
    at org.apache.ibatis.type.TypeAliasRegistry.resolveAlias(TypeAliasRegistry.java:116) ~[mybatis-3.4.4.jar:3.4.4]
    ... 83 common frames omitted


Process finished with exit code 1

原因:自己的粗心大意，jdbcType被我写成了javaType

<resultMap id="BaseResultMap" type="com.atguigu.springcloud.entities.xxxx">
        <id column="id" property="id" javaType="BIGINT"/>
        <id column="serial" property="serial" jdbcType="VARCHAR"/>
    </resultMap>

解决办法：JavaType对应的是类里的数据类型，jdbcType对应数据库里的类型

将javaType 改成jdbcType就可以了