org.hibernate.SessionException: Session is closed!

读取action然后把List的数据显示到页面上

 

Java code

 public List findAllCardinfo(String userid, Long cardid) {  Session session = HibernateSessionFactory.getSession();  StringBuffer sb = new StringBuffer();  Transaction tx = null;  Query queryObject = null;  try {  tx = session.beginTransaction();  sb .append("select new com.telezone.vo.CardinfoVO( cinfo.cardid ,cinfo.cardname , oinfo.ownername ,uinfo.username , cinfo.phonenum,cinfo.cardstate,cinfo.createtime,cinfo.otherinfo ) from Cardinfo as cinfo left join cinfo.cardownerinfo as oinfo left join cinfo.userinfo as uinfo where uinfo.userid = :uid ");  // Long 类型 cardid 默认取值 0  if (cardid > 0)   sb.append(" and cinfo.cardid = :cid");  sb.append(" order by cinfo.cardid");  queryObject = session.createQuery(sb.toString());  queryObject.setParameter("uid", userid);  if (cardid > 0)   queryObject.setParameter("cid", cardid);  tx.commit();  } catch (RuntimeException re) {  tx.rollback();  log.error("==CardinfoServices findAllCardinfo failed==", re);  re.printStackTrace();  } finally {  session.close();  }  return queryObject.list(); }

把session.close()注释掉就可以
但是session不是用完就需要关闭的吗？
用的是Struts+Hibernate


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finally在return前执行的,所以你是在关闭了session之后才返回,你觉得 这样会有数据么?
要么把return放在TRY里面,要么在前面定义一个list,然后在try里面list=queryObject.list();才能返回.
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正解：Hibernate使用了延迟加载Lazy，当你真正使用session的时候才会去执行查询。“queryObject.list();”这句才开始执行后台数据库查询 而你已经在finally中将session关闭

你可以去看下hibernate的延迟加载


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写在web.xml中 让session一直开着
<filter>
<filter-name>openSession </filter-name>
<filter-class>
org.springframework.orm.hibernate3.support.OpenSessionInViewFilter
</filter-class>
</filter>
<filter-mapping>
<filter-name>openSession </filter-name>
<url-pattern>/* </url-pattern>
</filter-mapping>
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将关联类的class级别lazy也设成false
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public List findAllCardinfo(String userid, Long cardid) {
  Session session = HibernateSessionFactory.getSession();
  StringBuffer sb = new StringBuffer();
  Transaction tx = null;
  Query queryObject = null;
  List rlist=null;
  try {
  tx = session.beginTransaction();
  sb
  .append("select new com.telezone.vo.CardinfoVO( cinfo.cardid  ,cinfo.cardname  , oinfo.ownername  ,uinfo.username , cinfo.phonenum,cinfo.cardstate,cinfo.createtime,cinfo.otherinfo ) from Cardinfo as cinfo left  join cinfo.cardownerinfo as oinfo left join cinfo.userinfo as uinfo where uinfo.userid = :uid ");
  // Long 类型 cardid 默认取值 0
  if (cardid > 0)
  sb.append(" and cinfo.cardid = :cid");
  sb.append(" order by cinfo.cardid");

  queryObject = session.createQuery(sb.toString());
  queryObject.setParameter("uid", userid);
  if (cardid > 0)