今天新搭了一个SSH框架但是报错了

Question

ssh

Answer 1

com.jxdb.action.UserAction.execute
看看这里有没有没实例化的对象

Answer 2

有一个User对象实例化了public class UserAction extends ActionSupport{
   public UserService userService;
public String username;
public String password;
public String password2;@Override
   public String execute() throws Exception{
   User u=new User();
   System.out.println(username+password);
   u.setUsername(username);
   u.setPassword(password);
   userService.add(u);
   return "success";
   }
  
   
public String getUsername() {
return username;
}public void setUsername(String username) {
this.username = username;
}public String getPassword() {
return password;
}public void setPassword(String password) {
this.password = password;
}public String getPassword2() {
return password2;
}public void setPassword2(String password2) {
this.password2 = password2;
}
public UserService getUserService() {
return userService;
}
public void setUserService(UserService userService) {
this.userService = userService;
}
   
   
   
   
   
}

Answer 3

我建议先集成spring和hibernate，再利用struts2支持spring的插件jar文件集成进去。不要一起全部集成，会很难排查错误的

Answer 4

首先你要学会看异常 
java.lang.NullPointerException
 com.jxdb.action.UserAction.execute(UserAction.java:19)说明在你UserAction.java的19行 报了空指针异常   然后分析你代码，你JAVA类应该没什么问题，所以问题应该出在你Spring的注入上，你的Spring没有吧userService注入到UserAction中，所以：检查你Spring的配置文件中是否注入了userService吧。

Answer 5

同意楼上的，可能是你的Spring没注入，会报空指针，以前我也遇到过！

Answer 6

com.jxdb.action.UserAction.execute
看看这里有没有没实例化的对象

Answer 7

userService没注入。 或者你需要new出一个UserService

Answer 8

同意楼上的，可能是你的Spring没注入，会报空指针，以前我也遇到过！

Answer 9

userService没有注入spring管理吧？ 加上注解@Autowired   UserAction如果也让spring管理了  加上注解@Component。

Answer 10

<?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.bjsxt" />--> <!-- 
<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:properties/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.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource" />

<property name="mappingLocations">
          <list>
            <value>classpath:/com/jxdb/model/hbm/User.hbm.xml</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="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
<property name="sessionFactory" ref="sessionFactory"></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.jxdb.service.*.*(..))" />
<aop:advisor pointcut-ref="bussinessService"
advice-ref="txAdvice" />
</aop:config> <tx:advice id="txAdvice" transaction-manager="txManager">
<tx:attributes>

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

<bean id="userDao" class="com.jxdb.dao.daoImpl.UserDaoImpl">
<property name="sessionFactory" ref="sessionFactory"></property>
</bean>
<bean id="userService" class="com.jxdb.service.serviceImpl.UserServiceImpl">
<property name="userDao" ref="userDao"></property>
</bean>
<bean id="userAction" class="com.jxdb.action.UserAction">
<property name="userService" ref="userService"></property>

</bean></beans>

Answer 11

public class UserAction extends ActionSupport{
   public UserService userService;
public String username;
public String password;
public String password2;@Override
   public String execute() throws Exception{
   User u=new User();
   System.out.println(username+password);
   u.setUsername(username);
   u.setPassword(password);
   userService.add(u);
   return "success";
   }
  
   
public String getUsername() {
return username;
}public void setUsername(String username) {
this.username = username;
}public String getPassword() {
return password;
}public void setPassword(String password) {
this.password = password;
}public String getPassword2() {
return password2;
}public void setPassword2(String password2) {
this.password2 = password2;
}
public UserService getUserService() {
return userService;
}
public void setUserService(UserService userService) {
this.userService = userService;
}
   
   可能是有些地方配置错了吧

Answer 12

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"
"http://struts.apache.org/dtds/struts-2.1.dtd"><struts>
         <constant name="struts.objectFactory" value="spring"></constant>

<package name="user"  extends="struts-default" namespace="">
      
<action name="user" class="userAction"> <result name="success">/registerSuccess.jsp</result> </action>
</package>
</struts>