java.lang.NullPointerException

[u010353901]

我的ssh框架做的项目，写到DAO当我测试是就报了下面的错误：空指针异常；
找了许久没有找到错误；
Exception in thread "main" java.lang.NullPointerException
at com.douban.DAOImpl.userDAOImpl.deleteUser(userDAOImpl.java:33)
at com.douban.util.usertested.main(usertested.java:15)

package com.douban.DAO;

import java.util.ArrayList;
import java.util.List;

import com.douban.bean.User;

public interface UserDAO {
	public void deleteUser(int id);	
	public void saveuser(User user);
	public void updateUser(User user);
}
DAO实现方法
package com.douban.DAOImpl;

import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.springframework.orm.hibernate3.HibernateCallback;
import org.springframework.orm.hibernate3.HibernateTemplate;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import com.douban.DAO.UserDAO;
import com.douban.bean.User;

public class userDAOImpl  implements UserDAO {

	private HibernateTemplate hibernateTemplate;
	
	public HibernateTemplate getHibernateTemplate() {
		return hibernateTemplate;
	}

	public void setHibernateTemplate(HibernateTemplate hibernateTemplate) {
		this.hibernateTemplate = hibernateTemplate;
	}

	
	public void deleteUser(int id) {
		
		final String sql = "delete from user where userId=?";
错误处吸纳在这一行-------》hibernateTemplate.execute(new HibernateCallback() {
			
			public Object doInHibernate(Session session) throws HibernateException,
					SQLException {
				Query query=  session.createQuery(sql);
				return query;
			}
		});
	}
       
       public void saveuser(User user) {
		this.getHibernateTemplate().saveOrUpdate(user);	
	}

	public void updateUser(User user) {
		// TODO Auto-generated method stub
		String sqlString = "update user set userName=?";
		this.getHibernateTemplate().update(user);
	}

}
测试文件
package com.douban.util;
import org.junit.Test;
import com.douban.DAO.UserDAO;
import com.douban.DAOImpl.userDAOImpl;

public class UserTest {

	@Test
	public void test() {
		UserDAO  uer=new userDAOImpl();
		//uer.checkUser("LarenMake", "123");
		uer.deleteUser(3);《--------错误出现在这里
		//uer.findById(1);
	}
}

application.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

	<bean id="dataSource"
		class="org.apache.commons.dbcp.BasicDataSource"
		destroy-method="close">

		<property name="driverClassName">
			<value>com.mysql.jdbc.Driver</value>
		</property>

		<property name="url">
			<value>jdbc:mysql://localhost:3306/douban</value>
		</property>

		<property name="username">
			<value>root</value>
		</property>

		<property name="password">
			<value>986681543</value>
		</property>

	</bean>

	<bean id="sessionFactory"
		class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">

		<property name="dataSource">
			<ref local="dataSource" />
		</property>

		<property name="hibernateProperties">
			<props>
				<prop key="hibernate.dialect">
					org.hibernate.dialect.MySQLDialect
				</prop>
				<prop key="hibernate.show_sql">true</prop>
			</props>
		</property>
		
		<property name="mappingResources">
			<list>
				<value>com/douban/bean/user.hbm.xml</value>
				<value>com/douban/bean/Score.hbm.xml</value>
				<value>com/douban/bean/PlayerType.hbm.xml</value>
				<value>com/douban/bean/MovieType.hbm.xml</value>
				<value>com/douban/bean/MovieMessage.hbm.xml</value>
				<value>com/douban/bean/makePlace.hbm.xml</value>
				<value>com/douban/bean/FilmAliasNames.hbm.xml</value>
				<value>com/douban/bean/comment.hbm.xml</value>
				<value>com/douban/bean/BeanColumn.hbm.xml</value>
				<value>com/douban/bean/ActorMessage.hbm.xml</value>
			</list>
		</property>

	</bean>
	<!-- 添加hibernTemplate  Bean属性 -->
	<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
		<property name="sessionFactory" ref="sessionFactory"></property>
	</bean>
	
	<!-- DAO配置 -->
	<bean id="userDao" class="com.douban.DAOImpl.userDAOImpl" scope="singleton">
		<property name="hibernateTemplate">
			<ref bean="hibernateTemplate"/>
		</property>
	</bean>

	<!-- service  配置 -->
	<bean id="userService" class="com.douban.serviceImpl.UserServiceImpl" >
		<property name="userDAO"  ref="userDao">
			
		</property>	
	</bean>
	
	<!-- action  配置 -->
	<bean id="LoginAction" class="com.douban.action.LoginAction" scope="prototype">
		<property name="userService" ref="userService">
		</property>
	</bean>
	
	<bean id="RegisterAction" class="com.douban.action.RegisterAction" scope="prototype">
		<property name="userService" ref="userService"></property>
	</bean>
</beans>