Mybatis PersistenceException异常：Error building SqlSession The error may exist in SQL Mapper Configur

初学mybatis出现了这个异常：

org.apache.ibatis.exceptions.PersistenceException: 
### Error building SqlSession.
### The error may exist in SQL Mapper Configuration
### Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: org.apache.ibatis.datasource.DataSourceException: Unknown DataSource property: driverClassName

通过调试发现错误出现在第三行代码

InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
SqlSessionFactory factory = builder.build(in);

确定问题出在 SqlMapConfig.xml配置文件中

仔细检查自己的配置文件

<transactionManager type=""></transactionManager>

发现 tpye属性忘了赋值

<transactionManager type="JDBC"></transactionManager>

重新赋值之后成功链接上了数据库

本文地址：https://blog.csdn.net/weixin_45718916/article/details/107665683