I created a hibernate mapping for an entity (group) that has a one-to-many relation to another (student) in a set (with cascade=all) and generated my java beans by hbm2java.

The problem is when i insert more than one new student the are getting replace by each other because they all have a null id i found the solution to add this two lines to the equals method

if( id == null )
return this == other;

now the problem is i need to add this each time i regenerate the beans java file and my entity relation model is not so small.

Any help will be appreciated.

Thanks

you can adjust the templates to do your custom equals/hashcode implementation.

But got and read http://www.hibernate.org/109.html before.
Your equals implementation is not a equals/hashcode that will behave correct when used within collections.