[main] 22:02:01.106  DEBUG o.a.i.t.jdbc.JdbcTransaction - Opening JDBC Connection

[main] 22:02:02.719  DEBUG o.a.i.d.pooled.PooledDataSource - Created connection 671471369.

[main] 22:02:02.722  DEBUG o.a.i.t.jdbc.JdbcTransaction - Setting autocommit to false on JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@2805d709]

[main] 22:02:02.732  DEBUG classes.selectOne - ==>  Preparing: select * from classes where name = '一班' 

[main] 22:02:02.860  DEBUG classes.selectOne - ==> Parameters: 

org.apache.ibatis.exceptions.PersistenceException: 

### Error querying database.  Cause: java.lang.IndexOutOfBoundsException: Index: 4, Size: 4

### The error may exist in mappers/Classes.xml

### The error may involve classes.selectOne

### The error occurred while handling results

### SQL: select * from classes where name = '一班'

### Cause: java.lang.IndexOutOfBoundsException: Index: 4, Size: 4