大神们帮忙啊

[sxlwan1991]

SSH整合 struts2+spring2.5.6+hibernate3.3 Myeclipse+tomc7+JDK7
只先实现登陆功能 但提交后报空指针异常
The server encountered an internal error () that prevented it from fulfilling this request.

exception

java.lang.NullPointerException
cn.service.impl.PersonServiceImpl.personLogin(PersonServiceImpl.java:20)
cn.action.PersonAction.execute(PersonAction.java:42)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:601)
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:452)
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:291)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:254)
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263)
org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:133)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:142)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:166)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:485)
org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)


PersonDao.java
import org.springframework.transaction.annotation.Transactional;

import cn.dao.CenericDao;
import cn.vo.Person;

@Transactional
public interface PersonDao extends CenericDao<Person, Integer>{

@Transactional(readOnly=true)
public Person personLogin(String name, String password);


}

PersonDaoImpl.java
public class PersonDaoImpl extends CenericDaoImpl<Person, Integer> implements PersonDao{

@SuppressWarnings("unchecked")
public Person personLogin(String name, String password) {

String hql = "from Person as p where p.name=? and p.password=?";
List<Person> person = getHibernateTemplate().find(hql, new Object[]{name, password});
if(person.size() > 0){
return (Person)person.get(0);
}else{
return null;
}
}

}
PersonService.java

@Transactional
public interface PersonService {

@Transactional(readOnly=true)
public Person personLogin(String name, String password);

public void changePassword(Integer id, String newPassword);

}

PersonServiceImpl.java
@Entity
public class PersonServiceImpl implements PersonService {

private PersonDao personDao;

public void setPersonDao(PersonDao personDao) {
this.personDao = personDao;
}

public Person personLogin(String name, String password) {
System.out.println(personDao);
System.out.println(personDao.personLogin(name, password));
return personDao.personLogin(name, password);
}

public void changePassword(Integer id, String newPassword) {

Person user = personDao.findById(id);
user.setPassword(newPassword);
personDao.update(user);
}


}

PersonAction.java
public class PersonAction extends ActionSupport {

private static final long serialVersionUID = -7259987330558645455L;
private PersonService personService;
private Person person;
private String message;

public String getMessage() {
return message;
}

public void setMessage(String message) {
this.message = message;
}

public Person getPerson() {
return person;
}

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

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


public String execute() throws Exception {

personService = new PersonServiceImpl();
person = personService.personLogin(person.getName(), person.getPassword());

if(null != person){

Map<String, Object> session = ActionContext.getContext().getSession();
session.put("person", person);
return SUCCESS;
}
else{
this.setMessage("用户名或密码错误，请从新登录！");
return INPUT;
}
}

[sxlwan1991]

配置文件补充：


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>

<package name="blog2" extends="struts-default">
<action name="login" class="loginAction">
<result name="success">/login_suc.jsp</result>
<result name="input">/login.jsp</result>
</action>
</package>

</struts>

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"
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/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">

<bean id="dataSource"
class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName"
value="com.microsoft.sqlserver.jdbc.SQLServerDriver">
</property>
<property name="url"
value="jdbc:sqlserver://localhost:1433;dataBase=person">
</property>
<property name="username" value="sa"></property>
<property name="password" value="1991"></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>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.format_sql">true</prop>
</props>
</property>
<property name="mappingResources">
<list>
<value>cn/vo/Person.hbm.xml</value>
<value>cn/vo/UploadFile.hbm.xml</value>
</list>
</property>
</bean>

<!-- 配置事务支持 -->
<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<!-- HibernateTransientactionManager bean 需要依赖注入一个SessionFactory bean 的引用 -->
<property name="sessionFactory">
<ref local="sessionFactory"/>
</property>
</bean>
<tx:annotation-driven transaction-manager="transactionManager"/>


<bean id="personDao" class="cn.dao.impl.PersonDaoImpl">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>

<bean id="personService" class="cn.service.impl.PersonServiceImpl">
<property name="personDao" ref="personDao"/>
</bean>

<bean id="loginAction" class="cn.action.PersonAction">
<property name="personService" ref="personService"/>
</bean>


</beans>

web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">

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


<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
<!--org.apache.struts2.dispatcher.FilterDispatcher-->
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

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



</web-app>

[sxlwan1991]

求大神们指点啊 困扰几天了

[MiceRice]

估计是注入没做好。

java.lang.NullPointerException
cn.service.impl.PersonServiceImpl.personLogin(PersonServiceImpl.java:20)

PersonServiceImpl.java 的 20 行是哪行？

[sxlwan1991]

用personService的时候我new了一下、加入Spring的时候没改过来
以修改了好了
不过还是多谢