为什么我会得到org.hibernate.HibernateException：没有配置CurrentSessionContext [英] Why do I get org.hibernate.HibernateException: No CurrentSessionContext configured

问题描述

我正在编写一个简单的项目，一个用Swing编写的商业应用程序，使用Hibernate作为后端。我来自Spring，这让我轻松地使用休眠和事务。无论如何，我设法让Hibernate工作。昨天，在编写一些代码从DB中删除一个bean时，我得到了这个结果：

  org.hibernate.HibernateException：非法尝试将一个集合与两个打开的会话相关联
  

删除代码很简单：

  Session sess = HibernateUtil.getSession（）; 
 Transaction tx = sess.beginTransaction（）; 
尝试{
 tx.begin（）; 
 sess.delete（ims）; 
} catch（Exception e）{
 tx.rollback（）; 
 throw e; 
} 
 tx.commit（）; 
 sess.flush（）; 
  

和我的 HibernateUtil.getSession（）是：

  public static Session getSession（）throws HibernateException {
 Session sess = null; 
尝试{
 sess = sessionFactory.getCurrentSession（）; 
} catch（org.hibernate.HibernateException he）{
 sess = sessionFactory.openSession（）; 
} 
 return sess; 
 
 
 
 
 
 $ p 
其他细节：我从不在我的代码中关闭一个hibernate会话，只是在应用程序中收盘。这是错的吗？为什么我在删除时只有这个（只为那个bean，其他人在工作），并且我不在其他操作上（插入，查询，更新）？
 
 
 
 I阅读，我试图修改我的 getSession 方法只需在 sessionFactory.getCurrentSessionCall（）中，但我得到： org.hibernate.HibernateException：没有配置CurrentSessionContext！ 
 
 
 
 Hibernat conf： 
 
 
 < hibernate-configuration> 
< session-factory> 
< property name =hibernate.dialect> org.hibernate.dialect.MySQLDialect< / property> 
< property name =hibernate.connection.driver_class> com.mysql.jdbc.Driver< / property> 
< property name =hibernate.connection.url> jdbc：mysql：// localhost / joptel< / property> 
< property name =hibernate.connection.username>根< / property> 
< property name =hibernate.connection.password> ******< / property> 
< property name =hibernate.connection.pool_size> 1< / property> 
< property name =show_sql> true< / property> 
< property name =hibernate.hbm2ddl.auto>更新< / property> 
 
 
 ..mappings .. 
 
< / session-factory> 
< / hibernate-configuration> 
  
 
 
解决方案
我想问你一件事，为什么你试图使用OpenSession方法？
  public static Session getSession（）throws HibernateException {
 Session sess = null; 
尝试{
 sess = sessionFactory.getCurrentSession（）; 
} catch（org.hibernate.HibernateException he）{
 sess = sessionFactory.openSession（）; 
} 
 return sess; （
）
  
您不必调用 openSession（） ，因为 getCurrentSession（）方法总是返回当前会话（如果已将其配置为线程，则为线程）。 
 
 
 
我知道了！... 
您必须在您的hibernate.cfg.xml文件中指定当前上下文
 
 
 
应该是： 
 
 
 < property name =hibernate.current_session_context_class>线程< / property> 
  
 
I'm writing a simple project, a business app written in Swing, using Hibernate for back-end. I come from Spring, that gave me easy ways to use hibernate and transactions. Anyway I managed to have Hibernate working. Yesterday, while writing some code to delete a bean from DB, I got this: 
org.hibernate.HibernateException: Illegal attempt to associate a collection with two open sessions
The deletion code is simply:
    Session sess = HibernateUtil.getSession();
    Transaction tx = sess.beginTransaction();
    try {
        tx.begin();
        sess.delete(ims);
    } catch (Exception e) {
        tx.rollback();
        throw e;
    }
    tx.commit();
    sess.flush();
and my HibernateUtil.getSession() is:
    public static Session getSession() throws HibernateException {
        Session sess = null;
        try {
            sess = sessionFactory.getCurrentSession();
        } catch (org.hibernate.HibernateException he) {
            sess = sessionFactory.openSession();
        }
        return sess;
    }
additional details: I never close a hibernate session in my code, just on application closing. Is this wrong? Why do I get this on delete (only for that bean, others do work), and I don't on other operations (Insert, query, update)?


I read around and I tried to modify my getSession method simply in a sessionFactory.getCurrentSessionCall(), but I got: org.hibernate.HibernateException: No CurrentSessionContext configured!

Hibernat conf:
<hibernate-configuration>
    <session-factory >
    <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="hibernate.connection.url">jdbc:mysql://localhost/joptel</property>
    <property name="hibernate.connection.username">root</property>
    <property name="hibernate.connection.password">******</property>
    <property name="hibernate.connection.pool_size">1</property>
    <property name="show_sql">true</property>
    <property name="hibernate.hbm2ddl.auto">update</property>


    ..mappings..

    </session-factory>
</hibernate-configuration>

解决方案
I wanted to ask you one thing, why are you trying to use "OpenSession" method?
public static Session getSession() throws HibernateException {         
   Session sess = null;       
   try {         
       sess = sessionFactory.getCurrentSession();  
   } catch (org.hibernate.HibernateException he) {  
       sess = sessionFactory.openSession();     
   }             
   return sess;
} 
You don't have to call openSession(), because getCurrentSession() method is always returns current session (Thread in case if you have configured it to be). 

I got it!... 
You have to specify current context in your hibernate.cfg.xml file

it should be: 
<property name="hibernate.current_session_context_class">thread</property>


                        
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