SSH整合的错误，NullPointerException

SSH整合的一个小例子，struts2+Spring2+Hibernate3
代码如下：
Person.java
package com.eva.po;
/**
* Person entity.
*
* @author eva
*/
import java.io.Serializable;public class Person implements Serializable{

private int id;
private String name;
private int age;
private String sex;
private String address;

/** defult constructor */
public Person() {

}
/** minimal constructor */
public Person(String name) {
this.name = name;
}
/** full constructor */
public Person(String name,int age,String sex,String address) {
this.name = name;
this.age = age;
this.sex = sex;
this.address = address;
}
         //setter and getter
}
PersonDAO.java

package com.eva.dao;

import java.util.List;

import com.eva.po.Person;

public interface PersonDAO {
    public void saveOrUpdate(Person person);
    public void update(Person person);
    public void delete(Person person);
    public Person get(String id);
    public List<Person> findAll();
}  PersonHibernateDAO.java package com.eva.dao.hibernate;

import java.util.List;

import com.eva.dao.PersonDAO;
import com.eva.po.Person;

import org.hibernate.SessionFactory;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

public class PersonHibernateDAO extends HibernateDaoSupport implements
        PersonDAO {
    public void delete(Person person) {
        this.getHibernateTemplate().delete(person);
    }

    public List<Person> findAll() {
        List<Person> persons = this.getHibernateTemplate().find("from Person");
        return persons;
    }

    public Person get(String id) {
        Person person = (Person)this.getHibernateTemplate().get(Person.class, id);
        return person;
    }

    public void saveOrUpdate(Person person) {
        this.getHibernateTemplate().saveOrUpdate(person);
    }

    public void update(Person person) {
        this.getHibernateTemplate().saveOrUpdate(person);
    }

}
PersonService.java package com.eva.service;

import java.util.List;

import com.eva.dao.hibernate.PersonHibernateDAO;
import com.eva.po.Person;

public class PersonService {
    private PersonHibernateDAO personHibernateDAO;

    public void setPersonHibernateDAO(PersonHibernateDAO personHibernateDAO) {
        this.personHibernateDAO = personHibernateDAO;
        System.out.println("personHibernateDAO is null ? --- " + personHibernateDAO == null);
    }

    public PersonHibernateDAO getPersonHibernateDAO() {
        return personHibernateDAO;
    }

    public void saveOrUpdate(Person person)
    {
        personHibernateDAO.saveOrUpdate(person);
    }

    public void update(Person person)
    {
        personHibernateDAO.update(person);
    }

    public void delete(Person person)
    {
        personHibernateDAO.delete(person);
    }

    public List<Person> findAll()
    {
        return personHibernateDAO.findAll();
    }

    public Person get(String id)
    {
        return personHibernateDAO.get(id);
    }

}
LoginAction.java package com.eva.action;

import java.util.List;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;

import com.eva.po.Person;
import com.eva.service.PersonService;
import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport {
    private PersonService personService;
    private Person person;
    private String id;
    private List<Person> persons;

    public LoginAction() {

    }

    public Person getPerson() {
        return person;
    }

    public void setPerson(Person person) {
        this.person = person;
    }

    public String getId() {
        return id;
    }

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

    public PersonService getPersonService() {
        return personService;
    }

    public void setPersonService(PersonService personService) {
        this.personService = personService;
    }

    public List<Person> getPersons() {
        return persons;
    }

    public void setPersons(List<Person> persons) {
        this.persons = persons;
    }

    public String execute() throws Exception {
        if (person != null & !person.equals("")) {
            personService.saveOrUpdate(person);
        }
        persons = personService.findAll();
        setPersons(persons);

        System.out.println(persons.size());
        return SUCCESS;
    }

    public String list() throws Exception {
        persons = personService.findAll();
        setPersons(persons);
        return SUCCESS;
    }

    public String save() throws Exception {;
        personService.saveOrUpdate(person);
        return SUCCESS;
    }

    public String update() throws Exception {
        person = personService.get(id);
        personService.update(person);
        return SUCCESS;
    }

    public String getValue() throws Exception {
        return SUCCESS;
    }
    public String delete() throws Exception{
        person = personService.get(id);
        personService.delete(person);
        return SUCCESS;
    }

}
  applicationContext.xml <?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-2.0.xsd">

    
    <bean id="dataSource"
        class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName">
            <value>com.microsoft.jdbc.sqlserver.SQLServerDriver</value>
        </property>
        <property name="url">
            <value>
                jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=ssh
            </value>
        </property>
        <property name="username">
            <value>sa</value>
        </property>
        <property name="password">
            <value>sa</value>
        </property>
    </bean>
    

    <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="dataSource">
            <ref bean="dataSource"/>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">
                    org.hibernate.dialect.SQLServerDialect
                </prop>
            </props>
        </property>
        <property name="mappingResources">
            <list>
                <value>com/eva/po/Person.hbm.xml</value></list>
        </property>
    </bean>

    
    <bean id="dao" class="com.eva.dao.hibernate.PersonHibernateDAO">
        <property name="sessionFactory">
            <ref bean="sessionFactory"/>
        </property>
    </bean>
    
    <bean id="personService" class="com.eva.service.PersonService">
        <property name="personHibernateDAO">
            <ref bean="dao"/>
        </property>
    </bean>

    
    <bean id="loginAction" class="com.eva.action.LoginAction">
        <property name="personService">
            <ref bean="personService"/>
        </property>
    </bean>
</beans>

解决方案 »

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struts.xml <?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>
    <constant name="struts.i18n.encoding" value="UTF-8" />
    
    <constant name="struts.objectFactory" value="spring" />
    
    <constant name="struts.devMode" value="true" />

    <package name="login" extends="struts-default">
        
        <action name="Login" method="save" class="com.eva.action.LoginAction">
            <result>success.jsp</result>
            
        </action>
        
        <action name="list" method="list" class="com.eva.action.LoginAction">
            <result>success.jsp</result>
        </action>
        
        <action name="delete" method="delete" class="com.eva.action.LoginAction">
            <result>success.jsp</result>
        </action>
        
        <action name="update" method="update" class="com.eva.action.LoginAction">
            <result>index.jsp</result>
        </action>
    </package>

</struts>
Person.hbm.xml <?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
    <class name="org.s2s2h3.po.Person" table="person_" catalog="ssh2">
        <id name="id" type="java.lang.String">
            <column name="id" length="10" />
            <generator class="assigned" />
        </id>
        <property name="name" type="java.lang.String">
            <column name="name" length="30" not-null="true" />
        </property>
        <property name="age" type="java.lang.String">
            <column name="age" length="10" />
        </property>
        <property name="sex" type="java.lang.String">
            <column name="sex" length="10" />
        </property>
        <property name="address" type="java.lang.String">
            <column name="address" length="50" />
        </property>
    </class>
</hibernate-mapping>  web.xml <?xml version="1.0" encoding="UTF-8"?>
<web-app id="person" version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
    <display-name>person</display-name>
    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>
            org.apache.struts2.dispatcher.FilterDispatcher
        </filter-class>
        <init-param>
            <param-name>classes</param-name>
            <param-value>java.lang.Object</param-value>
        </init-param>
    </filter>

    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/applicationContext*.xml</param-value>
    </context-param>
    
    <listener>
        <listener-class>
            org.springframework.web.context.ContextLoaderListener
        </listener-class>
    </listener>
</web-app>

index.jsp <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://"
            + request.getServerName() + ":" + request.getServerPort()
            + path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
    <head>
        <base href="<%=basePath%>">

        <title>My JSP 'index.jsp' starting page</title>
        <meta http-equiv="pragma" content="no-cache">
        <meta http-equiv="cache-control" content="no-cache">
        <meta http-equiv="expires" content="0">
        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
        <meta http-equiv="description" content="This is my page">
        
    </head>

    <body>
        <s:if test="null == person">
        Add Person
        </s:if>
        <s:else>
        Update Person
        </s:else>
        <s:form action="Login" method="post">
            <table>
                <caption>
                    客户管理
                </caption>
                <tr>
                    <td>
                        <s:textfield name="person.id" label="ID" />
                    </td>
                </tr>
                <tr>
                    <td>
                        <s:textfield name="person.name" label="NAME" />
                    </td>
                </tr>
                <tr>
                    <td>
                        <s:textfield name="person.age" label="AGE" />
                    </td>
                </tr>
                <tr>
                    <td>
                        <s:textfield name="person.sex" label="SEX" />
                    </td>
                </tr>
                <tr>
                    <td>
                        <s:textfield name="person.address" label="ADDRESS" />
                    </td>
                </tr>
                <tr>
                    <td colspan="2">
                        <s:submit value="submit" />
                        <s:reset value="reset" />
                    </td>
                </tr>
            </table>

        </s:form>
    </body>
</html>
添加数据之后点提交，会抛空指针错误，原因是是执行到PersonService的时候，personHibernateDAO为null
困惑，希望路过的各位兄弟帮忙看看。。谢过先~~
现在又变成到LoginAction.java就抛空指针了personService为空
最好把错误信息贴出来
看样子你的spring都没起作用，web.xml里spring的监听你配置了吗
spring的监听器配置了，getter setter也都写了呀，applicationContext.xml里也都配置了我代码都贴上了，错误就是抛一空指针啊