package com.univ.util;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;

public class CommonUtility {

public void create(Object obj){
   Session session = HibernateUtil.getSessionFactory().openSession();
   Transaction transaction = null;
   
   try{
      System.out.println("CommonUtility - create is running");
      transaction = session.beginTransaction();
      
      session.save(obj);
      transaction.commit();
      System.out.println("CommonUtility - transaction is commited successfully");
   
  }catch (Exception e) {
    transaction.rollback();
    e.printStackTrace();   
}finally {
     session.close();
    }
   }
}

package com.univ.util;

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

public class HibernateUtil {
   private static final SessionFactory sessionFactory;
   static {
      try {
         sessionFactory = new Configuration().configure().buildSessionFactory();
      }catch (Throwable ex) {
         System.err.println("Initial SessionFactory creation failed." + ex);
         throw new ExceptionInInitializerError(ex);
      }
   }
   
   public static SessionFactory getSessionFactory() {
      return sessionFactory;
   }
}

Exception in thread "main" java.lang.NullPointerException
   at com.univ.util.CommonUtility.create(CommonUtility.java:22)
   at com.univ.process.CourseMethods.createCourse(CourseMethods.java:18)
   at com.univ.process.Tester.main(Tester.java:36)

package com.univ.process;

import com.univ.util.CommonUtility;
import com.univ.pojo.Course;

public class CourseMethods {

   private Course course;

   
   public void setCourse(Course course) {
      this.course = course;
   }
   
   public void createCourse(){
      System.out.println("createCourse is running");
      CommonUtility cu = new CommonUtility();
      cu.create(course);
      System.out.println("createCourse is completed successfully");
   }
}

package com.univ.process;

import java.util.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import com.univ.pojo.Course;
import com.univ.process.CourseMethods;

public class Tester {

   
   
   public static void main(String[] args){
      Date dte=null;
      float courseFee=12000;
      
      Course c = new Course();
      CourseMethods cm = new CourseMethods();
      DateFormat df = new SimpleDateFormat("dd/mm/yyyy");
      
      try{
         dte = df.parse("22/12/2009");
      }catch(Exception e){
         e.getMessage();
      }
      
      c.setCourseName("Diploma in Computing");
      c.setCourseDesc("Diploma in Computing Description");
      c.setCourseEffectiveDate(dte);
      c.setCourseFee(courseFee);
      c.setCourseUniversity("Curtin University Of Technology");
      c.setCourseIsDeleted('0');
      
      cm.setCourse(c);
   
      cm.createCourse();
      
   }
}