Spring+Hibernate时遇到问题了

Question

在SPRING的Applicationcontext.XML中我是这样配置的
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">

com.microsoft.jdbc.sqlserver.SQLServerDriver


jdbc:microsoft:sqlserver://localhost:1433


sa


sa




8) 8)



org.hibernate.dialect.SQLServerDialect




com/soho/domain/Uservo.hbm.xml









这是HIBERNATE中的代码
public class UservoDAO extends HibernateDaoSupport {

private static final Log log = LogFactory.getLog(UservoDAO.class);

protected void initDao() {
    //do nothing
}

public void save(Uservo transientInstance) {
    log.debug("saving Uservo instance");
    try {

29行 getHibernateTemplate().save(transientInstance）；

log.debug("save successful");

} catch (RuntimeException re) {
log.error("save failed", re);
throw re;
}
}

public static UservoDAO getFromApplicationContext(ApplicationContext ctx) {
    return (UservoDAO) ctx.getBean("UservoDAO");
}
public static void main(String []args){
    UservoDAO userdao=new UservoDAO();
    Uservo user=new Uservo();
    user.setUserName("wangbaoping");
    user.setPassword("521520");

119行 userdao.save(user);

}

}
运行时出现Exception in thread "main" java.lang.NullPointerException
at com.soho.domain.UservoDAO.save(UservoDAO.java:29)
at com.soho.domain.UservoDAO.main(UservoDAO.java:119)

Answer 1

[code="java"]public static UservoDAO getFromApplicationContext(ApplicationContext ctx) {

return (UservoDAO) ctx.getBean("UservoDAO");

} [/code]

就是调用你自己的这个方法.

具体得到ctx的方法如下:
[1].
[code="java"]ApplicationContext ctx = new ClassPathXmlApplicationContext("application.xml"); // 你自己的配置文件名 [/code]

或

[2].
[code="java"]ApplicationContext ctx=new FileSystemXmlApplicationContext("c:\\bean.xml"); // 也可以使用这个 [/code]