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SEVERE: Duplicate entry '1' for key 'PRIMARY'

 
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hi all,
I am very new to hibernate and I am following a simple one to many example that I found on "Vaannila.com".

these are my tables :


my hibernate.cfg.xml



my HibernateUtil.java


this my student.java bean:



this my student.hbm.xml:


my phone.java bean




my phone.hbm.xml



my main method class:




my complete output:



can some please explain to me why i am getting a duplicate entry exception?

Thank You!!!
Shankha
 
shankhas sanyal
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i have fixed this....
apparently this application is trying to add multiple records of the same record to the join table
and since there are multiple entries to student id and phone id in the jointable this is what is causing the problem. How to fix this?

1. remove all foreign keys on the join table
2. alter the join table
3. remove the primary key
4. add a new primary key with auto increment
5. save the table
6. run the project and now it runs properly without any errors and it inserts perfectly into the tables
 
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