public class Users {
    public long userId;
    public String username;
    public String password;
    public String realname;
    public String email;
    public String homepage;
    public Date lastLogin;
    public String country;
   
//with the normal getter and setter methods

private static Configuration getConfig() throws HibernateException {
           Configuration config = new Configuration();
               return config.configure();
   }

   private static Session getSession() throws HibernateException {

               Configuration config = getConfig();
               SessionFactory sessionFactory = null;
               Session session = null;
               sessionFactory = config.buildSessionFactory();
               session = sessionFactory.openSession();
               System.out.println("Session value in getSession()" + session.toString());

        return session;
   }

}
//and an add method
public void add() {

       Session session = null;
        try {
            session = getSession();
        } catch (HibernateException he) {
            he.printStackTrace();
        }

       try {
           session.save(this);

           session.flush();
           session.connection().commit();
       } catch (Exception e) {
           e.printStackTrace();
           try {
               session.connection().rollback();
          } catch (Exception e1) {
               e1.printStackTrace();
           }

       }

   }
    public static void main(String [] args ) {

        Users u = new Users();
        u.setUsername("nilesh");
        u.setPassword("parmar");
        u.setRealname("Nilesh");
        u.setEmail("nilesh@pramati.com");
        u.setHomepage("localhost");
        u.setCountry("counteryName");
        u.setEmail("nilesh@pramati.com");
        Date today = new Date(System.currentTimeMillis());
        u.setLastLogin(today);
        u.add();

    }

<hibernate-mapping>
    <class name="org.weblog.user.Users" table="weblog_users">
        <id name = "userId" type ="int" column="userId">
            <generator class = "increment" />
        </id>
        <property name = "username"         type ="string"       column ="username"       length="40"/>
        <property name = "password"         type ="string"       column ="password"    length="30"/>
        <property name = "realname"         type ="string"       column ="realname"    length="80"/>
        <property name = "email"            type ="string"       column ="email"       length="50"/>
        <property name = "homepage"         type ="string"       column ="homePage"    length="80"/>
        <property name = "lastLogin"        type ="date"     column ="lasgLogin"   />
        <property name = "country"          type ="string"       column ="country"     length="80"/>
    </class>
</hibernate-mapping>

Hibernate: insert into weblog_users (username, password, realname, email, homePage, lasgLogin, country, userId) values (?, ?, ?, ?, ?, ?, ?, ?)
java.lang.ClassCastException
   at net.sf.hibernate.type.IntegerType.set(IntegerType.java:27)
   at net.sf.hibernate.type.NullableType.nullSafeSet(NullableType.java:46)
   at net.sf.hibernate.type.NullableType.nullSafeSet(NullableType.java:31)
   at net.sf.hibernate.persister.EntityPersister.dehydrate(EntityPersister.java:377)
   at net.sf.hibernate.persister.EntityPersister.insert(EntityPersister.java:476)
   at net.sf.hibernate.persister.EntityPersister.insert(EntityPersister.java:454)
   at net.sf.hibernate.impl.ScheduledInsertion.execute(ScheduledInsertion.java:20)
   at net.sf.hibernate.impl.SessionImpl.executeAll(SessionImpl.java:2100)
   at net.sf.hibernate.impl.SessionImpl.execute(SessionImpl.java:2061)
   at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2005)
   at org.weblog.user.Users.add(Users.java:129)
   at org.weblog.user.Users.main(Users.java:323)