connection error

[sas]

i m sending an object through a function and wants to put in a
database.i m using hibernate for this and getting the error can anybody
help me out regarding this...here is my code...
package parse;
import org.hibernate.*;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import java.util.*;

public class Dbinsert {

void dbinsert(Data obj){
Session session = null;

try{

System.out.println("starting");

SessionFactory sessionFactory = new
Configuration().configure().buildSessionFactory();
System.out.println("sessionFactory"+sessionFactory);
session =sessionFactory.openSession();

System.out.println("Inserting Record");
//Object obj = new Object();

session.save(obj);
System.out.println("Done");
}catch(NullPointerException e){
e.printStackTrace();
}catch(Throwable ex){
ex.printStackTrace();
}finally{
System.out.println("session"+session);

session.flush();
session.close();
}
}

}

i m getting the output like
sessionnull
java.lang.Nullpointerexception.