Bug notes

Bug Set

1. MyBatis Report errors java.io.IOException: Could not find resource mybatis.xml

1)  The possible causes of errors are resources Folder  ---->  Not marked as source root item   Solution: the right mouse button option marks the item as   Source root project 
2)   Maybe the path of the configuration file is written incorrectly 

2.Error updating database. Cause: java.sql.SQLException: Executes SQL Statement must not be blank or null

1)  see SQL Whether the syntax format is correct 
2) see sql Whether the statement has parameters or syntax errors ！

3. Exception in thread “main” org.apache.ibatis.exceptions.PersistenceException: Error querying database. Cause: java.sql.SQLRecoverableException: IO error : Undefined Error

1) Virtual machine selection is not set   -Duser.name=user
2)  see Mapper and Mybatis.xml Whether there is an error in the main configuration file 

4.Maven An error is reported in the project ：Error running ‘tomcat7’: Cannot start process, the working directory ‘E:\IDEA_Project\maven_Parent\maven_web’ does not exist

 The cause of the error ：
1） The configuration information may not be updated due to the deletion of a sub module or the modification of the name of the sub module in the project , Such as ： stay run--->Edit  Configrations--->working directory Whether the option item name is updated 

run—>Editconfigrations

Edit configrations Option is set