hibernate table per class strategy

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
<session-factory>
  <property name="hibernate.connection.driver_class">org.postgresql.Driver</property>
  <property name="hibernate.connection.url">jdbc:postgresql://localhost:5432/hibernatedb</property>
  <property name="hibernate.connection.username">postgres</property>
  <property name="hibernate.connection.password">root</property>
  <property name="hibersnate.connection.pool_size">10</property>
  <property name="show_sql">true</property>
  <property name="dialect">org.hibernate.dialect.PostgreSQLDialect</property>
  <property name="hibernate.hbm2ddl.auto">create</property> 
  <mapping class="org.gp.gpr.dto.UserDetails"/>  
   <mapping class="org.gp.gpr.dto.Vehicle"/> 
   <mapping class="org.gp.gpr.dto.TwoWheeler"/> 
   <mapping class="org.gp.gpr.dto.FourWheeler"/> 
   </session-factory>
</hibernate-configuration>

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package org.gp.gpr.hibernate;

import java.util.Date;

import org.gp.gpr.dto.Address;
import org.gp.gpr.dto.FourWheeler;
import org.gp.gpr.dto.TwoWheeler;
import org.gp.gpr.dto.UserDetails;
import org.gp.gpr.dto.Vehicle;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateTestInheritance {

public static void main(String[] args){

	
	Vehicle vehicle=new Vehicle();
	vehicle.setVehicleName("car");
	
	TwoWheeler bike=new TwoWheeler();
	bike.setVehicleName("Bike");
	bike.setSteeringHandle("bike steering handle");
	
	
	
	FourWheeler car=new FourWheeler();
	car.setVehicleName("toyota");
	car.setSteeringWheel("toyota steering wheeling");


	SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
	Session session=sessionFactory.openSession();
	session.beginTransaction();

session.save(vehicle);
session.save(bike);
session.save(car); 
session.getTransaction().commit();
session.close();

	
}
}

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package org.gp.gpr.dto;

import java.util.ArrayList;
import java.util.Collection;

import javax.persistence.DiscriminatorColumn;
import javax.persistence.DiscriminatorType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToMany;
import javax.persistence.ManyToOne;

import org.hibernate.annotations.NotFound;
import org.hibernate.annotations.NotFoundAction;

@Entity
@Inheritance(strategy=InheritanceType.TABLE_PER_CLASS)
//@DiscriminatorColumn(
//		name="VEHICLE_TYPE",
//		discriminatorType=DiscriminatorType.STRING
//		)
public class Vehicle {
	@Id@GeneratedValue
private int vehicleId;
private String vehicleName;
//@ManyToOne
//@JoinColumn(name="USER_ID")
//@ManyToMany(mappedBy="vehicle")
//private Collection<UserDetails> userList=new ArrayList();;
//@NotFound(action=NotFoundAction.IGNORE)
//private UserDetails user;
//public Collection<UserDetails> getUserList() {
//	return userList;
//}
//public void setUserList(Collection<UserDetails> userList) {
//	this.userList = userList;
//}
//public UserDetails getUser() {
//	return user;
//}
//public void setUser(UserDetails user) {
//	this.user = user;
//}
public int getVehicleId() {
	return vehicleId;
}
public void setVehicleId(int vehicleId) {
	this.vehicleId = vehicleId;
}
public String getVehicleName() {
	return vehicleName;
}
public void setVehicleName(String vehicleName) {
	this.vehicleName = vehicleName;
}

}

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package org.gp.gpr.dto;

import javax.persistence.DiscriminatorValue;
import javax.persistence.Entity;

@Entity
//@DiscriminatorValue("Bikee")
public class TwoWheeler extends Vehicle {
private String SteeringHandle;

public String getSteeringHandle() {
	return SteeringHandle;
}

public void setSteeringHandle(String steeringHandle) {
	SteeringHandle = steeringHandle;
}
}

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package org.gp.gpr.dto;

import javax.persistence.DiscriminatorValue;
import javax.persistence.Entity;

@Entity
//@DiscriminatorValue("carr")
public class FourWheeler extends Vehicle {
private String SteeringWheel;

public String getSteeringWheel() {
	return SteeringWheel;
}

public void setSteeringWheel(String steeringWheel) {
	SteeringWheel = steeringWheel;
}
}

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