[英]NPE SessionFactory in Spring/Hibernate integration
I'm a newbie in Spring and Hibernate and I'm having a NPE in this line: 我是Spring和Hibernate的新手,我在这行中有一个NPE:
Session session = getSessionFactory().getCurrentSession();
This is my UserDAO class 这是我的UserDAO类
public class UserDAO implements IUserDAO{
private SessionFactory sessionFactory;
public SessionFactory getSessionFactory() {
return sessionFactory;
}
public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}
@Override
public Integer updateUser(User user) {
// TODO Auto-generated method stub
return null;
}
@Override
public User searchUserIfExists(String username, String password) {
Session session = getSessionFactory().getCurrentSession();
Query query = session.createQuery(SEARCH_USER_ACCT);
query.setParameter("username", username);
query.setParameter("password",password);
List<User> userList = query.list();
System.out.println(userList.size());
User user = null;
return user;
}
And this is my UserController 这是我的UserController
@SessionAttributes(value = {"userSession"})
@Controller
public class UserController {
private IUserDAO userDAO;
@Autowired
public UserController(IUserDAO userDAO) {
this.userDAO = userDAO;
}
@RequestMapping(value = "/processLogin.htm", method=RequestMethod.POST)
public String login(@ModelAttribute User user,@RequestParam("username") String username,
@RequestParam("password") String password,
HttpServletRequest request, HttpServletResponse response){
userDAO = new UserDAO();
User userOb = userDAO.searchUserIfExists(username, password);
if(userOb != null){
ModelAndView modelAndView = new ModelAndView();
String role = userOb.getUserRole();
switch(role){
case "admin":
modelAndView.addObject("userSession", userOb);
modelAndView.addObject("userId", userOb.getUserId());
modelAndView.setViewName("/adminPage_admin");
break;
case "customer":
modelAndView.addObject("userSession", userOb);
modelAndView.addObject("userId", userOb.getUserId());
modelAndView.setViewName("/customerpage_customer");
break;
}
}
return "";
}
}
This is my xml configuration for spring 这是我对spring的xml配置
<?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:mvc="http://www.springframework.org/schema/mvc" xmlns:beans="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd">
<!-- Enable @Controller annotation support -->
<mvc:annotation-driven />
<mvc:default-servlet-handler/>
<!-- Map simple view name such as "test" into /WEB-INF/test.jsp -->
<beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<beans:property name="prefix" value="/jsp" />
<beans:property name="suffix" value=".jsp" />
</beans:bean>
<!-- Scan classpath for annotations (eg: @Service, @Repository etc) -->
<context:component-scan base-package="com.nacv2.*"/>
<context:spring-configured/>
<!-- JDBC Data Source. It is assumed you have MySQL running on localhost port 3306 with
username root and blank password. Change below if it's not the case -->
<bean id="myDataSource" 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/db_nac"/>
<property name="username" value="root"/>
<property name="password" value=""/>
<property name="validationQuery" value="SELECT 1"/>
</bean>
<!-- Hibernate Session Factory -->
<bean id="mySessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource" ref="myDataSource"/>
<property name="packagesToScan">
<array>
<value>com.nacv2.model.*</value>
</array>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">${hibernate.dialect}</prop>
<prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
<prop key="hibernate.connection.pool_size">${hibernate.connection.pool_size}</prop>
</props>
</property>
</bean>
<bean id="userDAO" class="com.nacv2.dataaccess.UserDAO">
<property name="sessionFactory" ref="mySessionFactory"/>
</bean>
<!-- Hibernate Transaction Manager -->
<bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<property name="sessionFactory" ref="mySessionFactory"/>
</bean>
<!-- Activates annotation based transaction management -->
<tx:annotation-driven transaction-manager="transactionManager"/>
</beans>
Your problem is actually on this line: 您的问题实际上就在这条线上:
userDAO = new UserDAO();
You have correctly wired Spring and Hibernate, but then you go and create a new object outside their knowledge, which won't know about the injected dependencies. 你已经正确地连接了Spring和Hibernate,但是你去创建一个他们知识之外的新对象,它不会知道注入的依赖关系。 Just use the one that's already been autowired for you. 只需使用已经为您自动装配的那个。
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