求助！myeclipise调用自动生成的DAO出错

public class Book implements java.io.Serializable {

	// Fields

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private Integer id;
	private String username;
	private String password;
	private Integer age;

	// Constructors

	/** default constructor */
	public Book() {
	}

	/** minimal constructor */
	public Book(String username, Integer age) {
		this.username = username;
		this.age = age;
	}

	/** full constructor */
	public Book(String username, String password, Integer age) {
		this.username = username;
		this.password = password;
		this.age = age;
	}

	// Property accessors

	public Integer getId() {
		return this.id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getUsername() {
		return this.username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public String getPassword() {
		return this.password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	public Integer getAge() {
		return this.age;
	}

	public void setAge(String age) {
		this.age = Integer.parseInt(age);
	    System.out.println(this.age);
	}

}

package domain;

import java.util.List;

import org.hibernate.LockOptions;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.criterion.Example;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.orm.hibernate4.support.HibernateDaoSupport;
import org.springframework.transaction.annotation.Transactional;

/**
 * A data access object (DAO) providing persistence and search support for Book
 * entities. Transaction control of the save(), update() and delete() operations
 * can directly support Spring container-managed transactions or they can be
 * augmented to handle user-managed Spring transactions. Each of these methods
 * provides additional information for how to configure it for the desired type
 * of transaction control.
 * 
 * @see domain.Book
 * @author MyEclipse Persistence Tools
 */
@Transactional
public class BookDAO extends  HibernateDaoSupport{
	private static final Logger log = LoggerFactory.getLogger(BookDAO.class);
	// property constants
	public static final String USERNAME = "username";
	public static final String PASSWORD = "password";
	public static final String AGE = "age";

	private SessionFactory sessionFactory;

	private Session getCurrentSession() {
		return sessionFactory.getCurrentSession();
	}

	protected void initDao() {
		// do nothing
	}

	public void save(Book transientInstance) {
		//System.out.println("-------------");
		//Transaction tr = currentSession().beginTransaction();
		//Transaction transaction= getCurrentSession().beginTransaction(); 
		log.debug("saving Book instance");
		try {
			getCurrentSession().save(transientInstance);
			//getHibernateTemplate().save(transientInstance);
			//tr.commit(); 
			log.debug("save successful");
		} catch (RuntimeException re) {
			log.error("save failed", re);
			throw re;
		}
	}

	public void delete(Book persistentInstance) {
		log.debug("deleting Book instance");
		try {
			getCurrentSession().delete(persistentInstance);
			log.debug("delete successful");
		} catch (RuntimeException re) {
			log.error("delete failed", re);
			throw re;
		}
	}

	public Book findById(java.lang.Integer id) {
		log.debug("getting Book instance with id: " + id);
		try {
			Book instance = (Book) getCurrentSession().get("domain.Book", id);
			return instance;
		} catch (RuntimeException re) {
			log.error("get failed", re);
			throw re;
		}
	}

	public List findByExample(Book instance) {
		log.debug("finding Book instance by example");
		try {
			List results = getCurrentSession().createCriteria("domain.Book")
					.add(Example.create(instance)).list();
			log.debug("find by example successful, result size: "
					+ results.size());
			return results;
		} catch (RuntimeException re) {
			log.error("find by example failed", re);
			throw re;
		}
	}

	public List findByProperty(String propertyName, Object value) {
		log.debug("finding Book instance with property: " + propertyName
				+ ", value: " + value);
		try {
			String queryString = "from Book as model where model."
					+ propertyName + "= ?";
			Query queryObject = getCurrentSession().createQuery(queryString);
			queryObject.setParameter(0, value);
			return queryObject.list();
		} catch (RuntimeException re) {
			log.error("find by property name failed", re);
			throw re;
		}
	}

	public List findByUsername(Object username) {
		return findByProperty(USERNAME, username);
	}

	public List findByPassword(Object password) {
		return findByProperty(PASSWORD, password);
	}

	public List findByAge(Object age) {
		return findByProperty(AGE, age);
	}

	public List findAll() {
		log.debug("finding all Book instances");
		try {
			String queryString = "from Book";
			Query queryObject = getCurrentSession().createQuery(queryString);
			return queryObject.list();
		} catch (RuntimeException re) {
			log.error("find all failed", re);
			throw re;
		}
	}

	public Book merge(Book detachedInstance) {
		log.debug("merging Book instance");
		try {
			Book result = (Book) getCurrentSession().merge(detachedInstance);
			log.debug("merge successful");
			return result;
		} catch (RuntimeException re) {
			log.error("merge failed", re);
			throw re;
		}
	}

	public void attachDirty(Book instance) {
		log.debug("attaching dirty Book instance");
		try {
			getCurrentSession().saveOrUpdate(instance);
			log.debug("attach successful");
		} catch (RuntimeException re) {
			log.error("attach failed", re);
			throw re;
		}
	}

	public void attachClean(Book instance) {
		log.debug("attaching clean Book instance");
		try {
			getCurrentSession().buildLockRequest(LockOptions.NONE).lock(
					instance);
			log.debug("attach successful");
		} catch (RuntimeException re) {
			log.error("attach failed", re);
			throw re;
		}
	}
}

package service;

import domain.Book;

public interface FunService {
	public void save(Book b);
}

package service;


import domain.Book;
import domain.BookDAO;

public class ServiceImpl implements FunService{
	private BookDAO bookDAO;

	public BookDAO getBookDAO() {
		return bookDAO;
	}

	public void setBookDAO(BookDAO bookDAO) {
		this.bookDAO = bookDAO;
	}
	@Override
	public void save(Book b) {
		// TODO Auto-generated method stub
		//System.out.println("----------------");
		this.bookDAO.save(b);
		}
}