mybatis之Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'Address...错误原因分析-优快云博客

本文链接：https://blog.youkuaiyun.com/chpllp/article/details/79115382

本文解决了一个关于MyBatis配置文件中实体类别名未正确配置导致的问题。具体表现为在mybatis-config.xml中未为Address实体类配置alias，导致在解析Mapper文件时出现异常。

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错误提示：

### Error building SqlSession.
### The error may exist in com/java1234/mappers/AddressMapper.xml
### The error occurred while processing mapper_resultMap[AddressResult]
### Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: 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 'Address'.  Cause: java.lang.ClassNotFoundException: Cannot find class: Address
	at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:26)
	at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:82)
	at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:66)
	at com.java1234.util.SqlSessionFactoryUtil.getSqlSessionFactory(SqlSessionFactoryUtil.java:20)
	at com.java1234.util.SqlSessionFactoryUtil.openSession(SqlSessionFactoryUtil.java:29)
	at com.java1234.service.StudentTest3.setUp(StudentTest3.java:27)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	...

错误原因：

MyBatis配置文件中 mybatis-config.xml中(即总的配置文件)没有对该实体类配置别名；

配置如下：

	<typeAliases>
		<typeAlias alias="Student" type="com.java1234.model.Student"/><!-- 实体类别名配置 -->
		<typeAlias alias="Address" type="com.java1234.model.Address"/><!-- 实体类别名配置 -->
	</typeAliases>