eclipse 使用Hibernate出错 java.lang.ClassNotFoundException

Question

http://dom4j.sourceforge.net/
下载 dom4j

Answer 1

谢谢，不过下载了那个包之后又有错误了java.lang.NullPointerException
org.dao.imp.ChapterDaoImp.getChapterByID(ChapterDaoImp.java:23)
org.action.ChapterAction.execute(ChapterAction.java:21)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
调用HibernateFactory的代码package org.dao.imp;import org.dao.ChapterDao;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.model.Chapter;
import org.util.HibernateSessionFactory;public class ChapterDaoImp implements ChapterDao
{
private SessionFactory sessionFactory; public void setSessionFactory(SessionFactory sessionFactory)
{
this.sessionFactory = sessionFactory;
}

public Chapter getChapterByID(Integer chapterID)
{
Session session=HibernateSessionFactory.getSession();
Transaction ts=session.beginTransaction();
Query query=session.createQuery("from Chapter where ChapterID=?"); 
query.setParameter(0, chapterID);
query.setMaxResults(1);
Chapter chapter=(Chapter) query.uniqueResult();
ts.commit();
HibernateSessionFactory.closeSession();

return chapter;
}

}

Answer 2

ClassNotFoundException找不到类异常
缺少hibernate的jar包或hibernate的jar包与其他包有冲突，看看hibernate*.jar有几个

Answer 3

Transaction ts=session.beginTransaction(); 
session 没获取成功。