struts2、Spring3、hibernate，运行时Action中提示service空指针

java_MagicWang 2012-02-01 01:34:14
Action代码如下：
package com.bbs.action;



import com.bbs.bean.User;

import com.bbs.service.UserService;



public class LoginAction {

	private User user;

	private String userName;

	private String pwd;

	private UserService userService;



	public String getUserName() {

		return userName;

	}



	public void setUserName(String userName) {

		this.userName = userName;

	}



	public String getPwd() {

		return pwd;

	}



	public void setPwd(String pwd) {

		this.pwd = pwd;

	}



	public User getUser() {

		return user;

	}



	public void setUser(User user) {

		this.user = user;

	}



	public String Login() {

		String rs = null;

		try {

			User user = userService.findUser(userName);

			System.out.println(user.getName() + user.getPasw());

			if (user != null && user.getPasw().equals(pwd)) {

				rs = "success";

			} else {

				rs = "error";

			}

		} catch (Exception e) {

			e.printStackTrace();

		}

		return rs;

	}



	public UserService getUserService() {

		return userService;

	}



	public void setUserService(UserService userService) {

		this.userService = userService;

	}

	

}

UserServiceImpl代码：
package com.bbs.service.impl;



import com.bbs.bean.User;

import com.bbs.dao.UserDao;

import com.bbs.service.UserService;



public class UserServiceImpl implements UserService{

	

	private UserDao userDao;



	@Override

	public User findUser(String userName) {

		return userDao.findUser(userName);

	}



	public UserDao getUserDao() {

		return userDao;

	}



	public void setUserDao(UserDao userDao) {

		this.userDao = userDao;

	}



}

struts.xml代码：
<?xml version="1.0" encoding="GBK" ?>   

<!DOCTYPE struts PUBLIC   

    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"   

    "http://struts.apache.org/dtds/struts-2.0.dtd">   

<struts>   

    <package name="front" namespace="/" extends="struts-default">   

        <action name="index">   

            <result>/index.jsp</result>   

        </action>

        <action name="toLogin">

         <result>/WEB-INF/jsp/login.jsp</result>       

        </action>

        <action name="login" class="com.bbs.action.LoginAction" method="Login">

         	<result name="success">/index.jsp</result>

         	<result name="error">/WEB-INF/jsp/error.jsp</result>       

        </action>   

    </package>   

</struts>

applicationContext.xml代码：
<?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: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/tx

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

	default-autowire="byName" default-lazy-init="true">



	<!-- 配置数据源 -->

	<bean id="myDataSource"

		class="org.springframework.jdbc.datasource.DriverManagerDataSource"

		destroy-method="close">

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

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

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

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

	</bean>

	<!-- 配置sessionFactory -->

	<bean id="sessionFactory"

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

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

		<property name="hibernateProperties">

			<props>

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

				<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>

			</props>

		</property>

		<property name="mappingResources">

			<list>

				<value>classpath:com/bbs/bean/User.hbm.xml</value>

			</list>

		</property>

	</bean>



	<bean id="userDao" class="com.bbs.dao.impl.UserDaoImpl">

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

	</bean>

	<bean id="userService" class="com.bbs.service.impl.UserServiceImpl">

		<property name="userDao">

			<ref local="userDao" />

		</property>

	</bean>

	<!-- 配置struts2的Action -->

	<bean name="loginAction" scope="prototype" class="com.bbs.action.LoginAction">

		<property name="userService">

			<ref local="userService" />

		</property>

	</bean>



</beans>

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java_MagicWang 2012-02-03
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[Quote=引用 10 楼 java_magicwang 的回复:]
引用 8 楼 zhk0377 的回复:
引用 6 楼 q327339905 的回复:

default-autowire="byName"， 去掉这个试试


既然都有 <property name="userDao">
<ref local="userDao" />
</property>
ref引用了，就不要default-autowire="byName"

是不是加了……
[/Quote]
但是去掉ref就报错了，
去掉default-autowire="byName"正常运行
java_MagicWang 2012-02-03
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[Quote=引用 8 楼 zhk0377 的回复:]
引用 6 楼 q327339905 的回复:

default-autowire="byName"， 去掉这个试试


既然都有 <property name="userDao">
<ref local="userDao" />
</property>
ref引用了，就不要default-autowire="byName"
[/Quote]
是不是加了default-autowire="byName"之后会根据你<property name="">的值自己去装配,下面的ref就多此一举了？不过我这样写也没报错~
java_MagicWang 2012-02-03
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谢谢楼上大各位了，我解决了，之所以空指针居然是因为少了个commons-pool.jar，struts.xml,applicationContext.xml我都没改。
我就改个名 2012-02-02
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default-autowire="byName"， 去掉这个试试
iteasy 2012-02-02
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[Quote=引用 6 楼 q327339905 的回复:]

default-autowire="byName"， 去掉这个试试
[/Quote]

既然都有 <property name="userDao">
<ref local="userDao" />
</property>
ref引用了，就不要default-autowire="byName"
不关橙猫猫事的哦 2012-02-02
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userService为空，看了代码和配置还真看不出为什么为null。。
wel_Sky 2012-02-02
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两个疑点:
1.userService注入进去了?
2.userName在数据库中存在？
这两个点都有可能出现空指针异常。如果我用户名不存在你登陆了 返回给你的绝对是个null
Spring89 2012-02-01
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既然在applicationContext.xml里加上了default-autowire="byName"，那么，你把下面配置bean的，全部去掉property
当然了，楼上说的也得改！这两个都改了你在试下吧！
java爱好者 2012-02-01
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你把这段代码


<action name="login" class="com.bbs.action.LoginAction" method="Login">

             <result name="success">/index.jsp</result>

             <result name="error">/WEB-INF/jsp/error.jsp</result>       

        </action>

改成


<action name="login" class="loginAction" method="Login">

             <result name="success">/index.jsp</result>

             <result name="error">/WEB-INF/jsp/error.jsp</result>       

        </action>

试试
java_MagicWang 2012-02-01
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控制台错误信息：
java.lang.NullPointerException
at com.bbs.action.LoginAction.Login(LoginAction.java:39)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:453)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:292)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:255)
at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)
at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:211)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:211)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:90)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:192)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:510)
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:662)
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