Hibernate inserts a data from the primary key increment

If the database has the field set to auto-increment

In its corresponding XX.hbm.xml, the background color is the red part

<id name= "userid" type= "Java.lang.Integer" >
<column name= "userid"/>
<generator class= "native"/>
<!--<generator class= "increment"/>-->
</id>

If the self-increment is made through the configuration file, the database is not set up and is configured as follows

<id name= "userid" type= "Java.lang.Integer" >
<column name= "userid"/>
<generator class= "increment"/>
</id>

Hibernate inserts a data from the primary key increment