整合ssh使用hibernateTemplate的find方法报空指针？

qqqwww198273 2012-04-07 04:15:30

这是entity类



package com.tjw.mysql.model;

import javax.annotation.Generated;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;



import org.springframework.stereotype.Component;



@Component("admin")

@Entity

public class Admin {

	private int id ;

	private String name ;

	private String password ;

	private int grade ;

	

	

	@Id



	public int getId() {

		return id;

	}

	

	public void setId(int id) {

		this.id = id;

	}

	public String getName() {

		return name;

	}

	public void setName(String name) {

		this.name = name;

	}

	public String getPassword() {

		return password;

	}

	public void setPassword(String password) {

		this.password = password;

	}

	public int getGrade() {

		return grade;

	}

	public void setGrade(int grade) {

		this.grade = grade;

	}

}

这是实现类



package com.tjw.mysql.dao.impl;



import java.io.Serializable;

import java.util.HashSet;

import java.util.List;

import java.util.Set;



import javax.annotation.Resource;

import javax.jms.Session;



import org.hibernate.Query;

import org.springframework.orm.hibernate3.HibernateTemplate;

import org.springframework.stereotype.Component;





import com.tjw.mysql.dao.AdminDAO;

import com.tjw.mysql.model.Admin;







@Component("adminDAO")

public class AdminImpl implements AdminDAO{

	private HibernateTemplate hibernateTemplate; 

	public void doCreate(Admin admin)  {

		// TODO Auto-generated method stub

		hibernateTemplate.save(admin);

	}



	public boolean doCreateOrdoUpdate(Admin admin) {

		// TODO Auto-generated method stub

		return false;

	}



	public void doDelete(Admin admin)  {

		

		this.hibernateTemplate.delete(admin);



	}



	public void doUpdate(Admin admin) {

		// TODO Auto-generated method stub

		this.hibernateTemplate.update(admin);

	}



	public List<Admin> findAll(){

		// TODO Auto-generated method stub

		 



		List<Admin> list = (List<Admin>)this. hibernateTemplate.find("from Admin");

		return list ; 

	}



	public Admin findById(int id) {

		// TODO Auto-generated method stub

		return null;

	}



	public int getCount() {

		// TODO Auto-generated method stub

		return 0;

	}



	public HibernateTemplate getHibernateTemplate() {

		return hibernateTemplate;

	}

	@Resource

	public void setHibernateTemplate(HibernateTemplate hibernateTemplate) {

		this.hibernateTemplate = hibernateTemplate;

	}



}

这是配置文件



<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

	xmlns:context="http://www.springframework.org/schema/context"

	xmlns:aop="http://www.springframework.org/schema/aop"

	xmlns:tx="http://www.springframework.org/schema/tx"

	xsi:schemaLocation="http://www.springframework.org/schema/beans

           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd

           http://www.springframework.org/schema/context

           http://www.springframework.org/schema/context/spring-context-2.5.xsd

           http://www.springframework.org/schema/aop

           http://www.springframework.org/schema/aop/spring-aop-2.5.xsd

           http://www.springframework.org/schema/tx 

           http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">

	<context:annotation-config />

	<context:component-scan base-package="com.tjw.mysql.model" />

	<context:component-scan base-package="com.tjw.mysql.service" />

	<context:component-scan base-package="com.tjw.mysql.dao.impl" />



	<!-- 

		<bean id="dataSource"

		class="org.apache.commons.dbcp.BasicDataSource"

		destroy-method="close">

		

		

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

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

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

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

		</bean>

	-->



	<bean

		class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

		<property name="locations">

			<value>classpath:jdbc.properties</value>

		</property>

	</bean>



	<bean id="dataSource" destroy-method="close"

		class="org.apache.commons.dbcp.BasicDataSource">

		<property name="driverClassName"

			value="${jdbc.driverClassName}" />

		<property name="url" value="${jdbc.url}" />

		<property name="username" value="${jdbc.username}" />

		<property name="password" value="${jdbc.password}" />

	</bean>



	<bean id="sessionFactory"

		class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">

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

		<!-- 

		<property name="annotatedClasses">

			<list>

				<value>com.bjsxt.model.User</value>

				<value>com.bjsxt.model.Log</value>

			</list>

		</property>

		下面是为了表明哪些是被entity注解标识的

		 -->

		 <property name="packagesToScan">

			<list>

				<value>com.tjw.mysql.model</value>

				

			</list>

		</property>

		<property name="hibernateProperties">

			<props>

				<prop key="hibernate.dialect">

					org.hibernate.dialect.MySQLDialect

				</prop>

				<prop key="hibernate.show_sql">true</prop>

			</props>

			

		</property>

	</bean>



	<bean id="txManager"

		class="org.springframework.orm.hibernate3.HibernateTransactionManager">

		<property name="sessionFactory" ref="sessionFactory" />

	</bean>



	<aop:config>

		<aop:pointcut id="bussinessService"

			expression="execution(public * com.bjsxt.service..*.*(..))" />

		<aop:advisor pointcut-ref="bussinessService"

			advice-ref="txAdvice" />

	</aop:config>



	<tx:advice id="txAdvice" transaction-manager="txManager">

		<tx:attributes>

			<tx:method name="getUser" read-only="true" />

			<tx:method name="add*" propagation="REQUIRED"/>

		</tx:attributes>

	</tx:advice>



	<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">

		<property name="sessionFactory" ref="sessionFactory"></property>

	</bean>



</beans>

简单地这样调用
AdminImpl adminImpl = new AdminImpl();
adminImpl.findAll();
报出异常
java.lang.NullPointerException
at com.tjw.mysql.dao.impl.AdminImpl.findAll(AdminImpl.java:52)
at com.tjw.mysql.model.TestAdmin.testStudent(TestAdmin.java:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:38)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)

这是为什么呢？我在beans.xml配置文件里不是把sessionFactory和hibernateTemplate都注入了吗怎么还出现空指针的异常呢

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