I am using Hibernate 4.3.5. I am using the Derby database and using the native generator for the primary key. Here the configuration in the hbm file:
<id name="isbn" column="col1" type="long">
<generator class="native">
</generator>
</id>
I also created the default 'hibernate_sequence' sequence in derby.
This does not generate the id and it assigns null to the value. I get the following error : Column 'col1' cannot accept a Null value.

I am able to generate the id values using 'sequence' and 'increment' generators.

Can someone let me know if I need to configure anything else for the native generator?

Thank you