Hi all
I am getting exception in the following program when i try to execute.

Code:

package roseindia.tutorial.hibernate;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;



public class FirstExample {
public static void main(String[] args) {
Session session = null;

try{
// This step will read hibernate.cfg.xml and prepare hibernate for use
SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
session =sessionFactory.openSession();
//Create new instance of Contact and set values in it by reading them from form object
System.out.println("Inserting Record");
Contact contact = new Contact();
contact.setId(6);
contact.setFirstName("Deepak");
contact.setLastName("Kumar");
contact.setEmail("deepak_38@yahoo.com");
session.save(contact);
System.out.println("Done");
}catch(Exception e){
System.out.println(e.getMessage());
}finally{
// Actual contact insertion will happen at this step
System.out.println("success");
session.beginTransaction().commit();
session.flush();
session.close();

}

}
}


Exception:

success
Exception in thread "main" java.lang.NullPointerException
at roseindia.tutorial.hibernate.FirstExample.main(FirstExample.java:37)

Hi Shiv,

Can u pls point out which is line 37. Also transaction should be started before session.save() is done . And close after it only.
Also please paste the logs or stacktrace .
Thanks

Line 37 is after the method close();

Sorry its the 37th line is the close() method.

When i debug the it shows on flush() method.

not sure but check in debug mode
session or session.beginTransaction() is null .....

You begin and commit your transaction in a single line, with no work being accomplished. Your session.save(object) should be inside the transaction, and it is not, in your code shown.

Typical to do it in these three steps:
a. begin your transaction
b. do your work - in this case your session.save(yourObject)
c. either commit transaction if successful or rollback transaction if unsuccessful.

Hope this helps,
Jeff

also, when you commit the transaction, it will flush. You can remove the session.flush() you have after the commit.

Something like this:
(note rollback not used for this simple example)

Transaction tx = session.beginTransaction();
// do your persistence work - any saves, deletes, updates
session.save(contact);
tx.commit();
session.close();