### The error may exist in SQL Mapper Configuration

### Cause: org.apache.ibatis.builder.BuilderException: Error creating document instance.  Cause: org.xml.sax.SAXParseException: Document root element "configuration", must match DOCTYPE root "mapper".

    at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:8)

    at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:32)

    at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:15)

    at com.mybatis.test.UserTest.main(UserTest.java:20)

错误来源，连接池的配置里面错了

连接词对应的dtd文件是mybatis-3-config.dtd，如果你是直接复制了mybatis-3-mapper.dtd就会报错，改过来就行了

Exception in thread "main" org.apache.ibatis.datasource.DataSourceException: Error setting driver on UnpooledDataSource. Cause: java.lang.NullPointerException

    at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.initializeDriver(UnpooledDataSource.java:179)

    at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.getConnection(UnpooledDataSource.java:57)

    at org.apache.ibatis.datasource.pooled.PooledDataSource.popConnection(PooledDataSource.java:349)

    at org.apache.ibatis.datasource.pooled.PooledDataSource.getConnection(PooledDataSource.java:55)

    at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSessionFromDataSource(DefaultSqlSessionFactory.java:72)

    at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSession(DefaultSqlSessionFactory.java:32)

    at com.mybatis.test.UserTest.main(UserTest.java:24)
错误来源：在连接池里面缺少驱动配置 <property name="driver" value="com.microsoft.sqlserver.jdbc.SQLServerDriver"/> 
　　　　　并且需要导入驱动包

### Error updating database.  Cause: org.apache.ibatis.reflection.ReflectionException: There is no getter for property named 'addtime' in 'class com.entity.UsersEntity'

### The error may involve com.entity.Users.insert-Inline

### The error occurred while setting parameters

### Cause: org.apache.ibatis.reflection.ReflectionException: There is no getter for property named 'addtime' in 'class com.entity.UsersEntity'

错误原因:需要赋值的参数名称跟你的实体类名称需要对应