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Hibernate version:Hibernate3.0

[b]Mapping documents:

[b]Code between sessionFactory.openSession() and session.close():
SimpleDateFormat formatter = new SimpleDateFormat("dd-MM-yyyy");
Configuration cfg=new Configuration();
cfg.configure(new File(System.getProperties().getProperty("sun.boot.library.path")+"\\hibernate.cfg.xml"));
SessionFactory sessionFactory=cfg.buildSessionFactory();
Tb_VoucherMain tb_vm=new Tb_VoucherMain(vMain.elementAt(0).toString(),formatter.parse(vMain.elementAt(1).toString()),vMain.elementAt(2).toString(),Double.parseDouble(vMain.elementAt(3).toString()),Double.parseDouble(vMain.elementAt(4).toString()),vMain.elementAt(5).toString());
Tb_VoucherDetail tb_vd=new Tb_VoucherDetail(vDetail.elementAt(4).toString(),vDetail.elementAt(0).toString(),Double.parseDouble(vDetail.elementAt(2).toString()),Double.parseDouble(vDetail.elementAt(3).toString()));
Session session=sessionFactory.openSession();
Transaction tx=session.beginTransaction();
session.save(tb_vm);
session.save(tb_vd);
tx.commit();
session.flush();
session.close();
Full stack trace of any exception that occurs:
No Exception.
Name and version of the database you are using:
MSSQLServer
The generated SQL (show_sql=true):

Debug level Hibernate log excerpt:

Can you show your mapping files ?

Make sure that unless you're using assigned id generation, your id fields are null.

I'd advise you to post your code between tags, so it will be easier to understand and to help. See ya.