这是我的代码：
public class GroupDao implements IDao {
[color=darkred]Session session = HibernateSessionFactory.getSession();
Transaction tran = session.beginTransaction();[/color]
public void insert(Object obj) {
Group group = (Group) obj;
session.save(group);
tran.commit();
HibernateSessionFactory.closeSession();
}
public List queryAll() {
String hql = "from Group";
Query query = session.createQuery(hql);
List list = query.list();
HibernateSessionFactory.closeSession();
return list;
}
}
jsp页面上报的错
exception
javax.servlet.ServletException:[color=red]Session is closed![/color] org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:523)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
com.school.QuanXianFilter.FilterEncoding.doFilter(FilterEncoding.java:23)
root cause
org.hibernate.SessionException: [color=red]Session is closed![/color] org.hibernate.impl.AbstractSessionImpl.errorIfClosed(AbstractSessionImpl.java:49)
org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:526)
org.hibernate.impl.SessionImpl.save(SessionImpl.java:518)
org.hibernate.impl.SessionImpl.save(SessionImpl.java:514)
com.school.QuanXianIDaoImpl.GroupDao.insert(GroupDao.java:26)
com.school.QuanXianAction.Action.addGroup(Action.java:36)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:585)
org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:274)
org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:194)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
com.school.QuanXianFilter.FilterEncoding.doFilter(FilterEncoding.java:23)
当我执行了插入以后，在返回页面，执行查询（queryAll（））方法后，jsp页面却抛出了以上异常信息
研究了好长时间，可是没找出错误的原因。
Session怎么能作为成员变量呢？这样意味着你的GroupDao 对象是不可以重复使用的。第二次使用肯定会出Session is close的错误。因为你第一次使用GroupDao 时候Session已经关闭。
public class GroupDao implements IDao {
public void insert(Object obj) {
Session session = HibernateSessionFactory.getSession();
Transaction tran = session.beginTransaction();
Group group = (Group) obj;
session.save(group);
tran.commit();
HibernateSessionFactory.closeSession();
}
public List queryAll() {
Session session = HibernateSessionFactory.getSession();
String hql = "from Group";
Query query = session.createQuery(hql);
List list = query.list();
HibernateSessionFactory.closeSession();
return list;
}
}
这样该没有问题了。
你出现错误原因楼上已经说的很清楚了。