Type interface mapper.StudentMapper is not known to the MapperRegistry

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错误提示

展开/折叠
org.apache.ibatis.binding.BindingException: Type interface mapper.StudentMapper is not known to the MapperRegistry.
    at org.apache.ibatis.binding.MapperRegistry.getMapper(MapperRegistry.java:47)
    at org.apache.ibatis.session.Configuration.getMapper(Configuration.java:779)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.getMapper(DefaultSqlSession.java:291)
    at test.OneToManyTest3.main(OneToManyTest3.java:14)

原因

没有在mybatis根配置文件中注册mapper文件

解决方案

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd" >
<configuration>
    <properties resource="db.properties">
    </properties>
    <settings>
        <setting name="logImpl" value="LOG4J" />
    </settings>
    <environments default="mysql">
        <environment id="mysql">
            <transactionManager type="JDBC"></transactionManager>
            <dataSource type="POOLED">
                <property name="driver" value="${driver}" />
                <property name="url" value="${url}" />
                <property name="username" value="${username}" />
                <property name="password" value="${password}" />
            </dataSource>
        </environment>
    </environments>
</configuration>