发错了第二个是<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><hibernate-mapping package="cn.hxex.exam.model">
<class table="select_question" name="cn.hxex.exam.model.SelectQuestion">
<id name="questionId" column="Que_Id">
<generator class="uuid.hex"/>
</id>
<property name="paperId" column="Paper_Id"/>
<property name="title" column="Que_Title"/>
<property name="score" column="Que_Score"/>
<property name="answer" column="Que_Answer"/>
<many-to-one column="Paper_Id" cascade="save-update" name="thePaper"/>
</class>
<!--<query name="getUserByName"><![CDATA[from User where name=:Name]]></query>-->
</hibernate-mapping>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><hibernate-mapping package="cn.hxex.exam.model">
<class table="select_question" name="cn.hxex.exam.model.SelectQuestion">
<id name="questionId" column="Que_Id">
<generator class="uuid.hex"/>
</id>
<property name="paperId" column="Paper_Id"/>
<property name="title" column="Que_Title"/>
<property name="score" column="Que_Score"/>
<property name="answer" column="Que_Answer"/>
<many-to-one column="Paper_Id" cascade="save-update" name="thePaper"/>
</class>
<!--<query name="getUserByName"><![CDATA[from User where name=:Name]]></query>-->
</hibernate-mapping>
sessionFactory 的话.可能和cfg文件配置有关..
贴出异常和cfg吧!!
org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:535)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:433)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
root cause java.lang.NullPointerException
cn.hxex.exam.dao.userDao.getUserByName(userDao.java:26)
cn.hxex.exam.action.action.LoginActionAction.execute(LoginActionAction.java:44)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.13 logs.
CFG<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"><!-- Generated by MyEclipse Hibernate Tools. -->
<hibernate-configuration><session-factory>
<property name="connection.url">
jdbc:mysql://localhost:3306/exam?useUnicode=true&characterEncoding=UTF-8
</property>
<property name="dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="connection.username">root</property>
<property name="connection.password">root</property>
<property name="connection.driver_class">
com.mysql.jdbc.Driver
</property>
<property name="show_sql">true</property>
<mapping resource="cn/hxex/exam/model/Classes.hbm.xml" />
<mapping resource="cn/hxex/exam/model/Student.hbm.xml" />
<mapping resource="cn/hxex/exam/model/Teacher.hbm.xml" />
<mapping resource="cn/hxex/exam/model/User.hbm.xml" />
<mapping resource="cn/hxex/exam/model/SelectQuestion.hbm.xml" />
<mapping resource="cn/hxex/exam/model/Yesno_Question.hbm.xml" />
<mapping resource="cn/hxex/exam/model/Paper.hbm.xml" /></session-factory></hibernate-configuration>
package com.sql.Driver;import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.cfg.Configuration;/**
* Configures and provides access to Hibernate sessions, tied to the
* current thread of execution. Follows the Thread Local Session
* pattern, see {@link http://hibernate.org/42.html }.
*/
public class HibernateSessionFactory { /**
* Location of hibernate.cfg.xml file.
* Location should be on the classpath as Hibernate uses
* #resourceAsStream style lookup for its configuration file.
* The default classpath location of the hibernate config file is
* in the default package. Use #setConfigFile() to update
* the location of the configuration file for the current session.
*/
private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";
private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();
private static Configuration configuration = new Configuration();
private static org.hibernate.SessionFactory sessionFactory;
private static String configFile = CONFIG_FILE_LOCATION; static {
try {
configuration.configure(configFile);
sessionFactory = configuration.buildSessionFactory();
} catch (Exception e) {
System.err.println("%%%% Error Creating SessionFactory %%%%");
e.printStackTrace();
}
}
private HibernateSessionFactory() {
}
/**
* Returns the ThreadLocal Session instance. Lazy initialize
* the <code>SessionFactory</code> if needed.
*
* @return Session
* @throws HibernateException
*/
public static Session getSession() throws HibernateException {
Session session = (Session) threadLocal.get(); if (session == null || !session.isOpen()) {
if (sessionFactory == null) {
rebuildSessionFactory();
}
session = (sessionFactory != null) ? sessionFactory.openSession(): null;
threadLocal.set(session);
} return session;
} /**
* Rebuild hibernate session factory
*
*/
public static void rebuildSessionFactory() {
try {
configuration.configure(configFile);
sessionFactory = configuration.buildSessionFactory();
} catch (Exception e) {
System.err
.println("%%%% Error Creating SessionFactory %%%%");
e.printStackTrace();
}
} /**
* Close the single hibernate session instance.
*
* @throws HibernateException
*/
public static void closeSession() throws HibernateException {
Session session = (Session) threadLocal.get();
threadLocal.set(null); if (session != null) {
session.close();
}
} /**
* return session factory
*
*/
public static org.hibernate.SessionFactory getSessionFactory() {
return sessionFactory;
} /**
* return session factory
*
* session factory will be rebuilded in the next call
*/
public static void setConfigFile(String configFile) {
HibernateSessionFactory.configFile = configFile;
sessionFactory = null;
} /**
* return hibernate configuration
*
*/
public static Configuration getConfiguration() {
return configuration;
}}这是由MyEclipse自动生成的代码,在
public static Session getSession() throws HibernateException {
Session session = (Session) threadLocal.get(); if (session == null || !session.isOpen()) {
if (sessionFactory == null) {
rebuildSessionFactory();//在这之后sessionFactory 还是空所以session 也为空 在后面调用session 的方法就出异常
}
session = (sessionFactory != null) ? sessionFactory.openSession(): null;
threadLocal.set(session);
} return session;
}
package cn.hxex.exam.dao;
import com.sql.Driver.*;
import java.util.*;
import cn.hxex.exam.model.*;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;public class userDao {
static Session session;
public static User getUser(String Id){
session=HibernateSessionFactory.getSession();
return (User)session.createQuery("from User u where u.u_ID='"+Id+"'").uniqueResult();
}
public static List getAllUser(){
session=HibernateSessionFactory.getSession();
return session.createQuery("from User u ").list();
}
public static User getUserByName(String Name){
session=HibernateSessionFactory.getSession();
return (User)session.createQuery("from User u where u.name='"+Name+"'").uniqueResult();
}
public static void updateUser(User u){
session=HibernateSessionFactory.getSession();
Transaction tx=session.beginTransaction();
session.update(u);
tx.commit();
session.close();
}
public static void addUser(User u){
session=HibernateSessionFactory.getSession();
Transaction tx=session.beginTransaction();
session.save(u);
tx.commit();
session.close();
}
public static void removeUser(String Id){
User u=getUser(Id);
if(u!=null)
{
session=HibernateSessionFactory.getSession();
Transaction tx=session.beginTransaction();
session.delete(u);
tx.commit();
session.close();
}
}
}
这行有问题啊,你debug进去看看那个为null??
public static User getUserByName(String Name){
session=HibernateSessionFactory.getSession();
return (User)session.createQuery("from User u where u.name='"+Name+"'").uniqueResult();
}
要生成public static User getUserByName(String Name){
session=HibernateSessionFactory.getSession();
return (User)session.createQuery("from User u where u.name='"+Name+"'").uniqueResult();
}
而且会调用session.createQuery方法
而session这时为空,就是这个原因
那是这个为null了,仔细看看你的cfg文件吧
Session session = (Session) threadLocal.get();
看看 是不是threadLocal.get()为null?
这个方法里面debug一遍 看哪里有问题