Question

我有两种方法：

public static Ticket issueTicket(User user,Service service,String[] seats) {
    Session ticSess= DB.factory.openSession();
    ticSess.beginTransaction();
    Date d= new Date();
    Ticket ticket=new Ticket(d, service, user);

    ticSess.save(ticket);
    ticSess.getTransaction().commit();
    int seatCount=seats.length;
    for (int i=0;i<seatCount;i++){
        int seatID=Integer.parseInt(seats[i]);
        Seat seat=getSeatByID(seatID);
        seat.setTicket(ticket);
        ticSess.update(seat);
    }
    return ticket;


}

和

public static Seat getSeatByID(int seatID) {
    Session proSess = DB.factory.openSession();
    proSess.beginTransaction();
    Seat c = (Seat) (proSess.load(Seat.class, seatID));
    proSess.getTransaction().commit();

    return c;
}

当我调用issueTicket方法时，我得到：

illegally attempted to associate a proxy with two open Sessions

如果我在getSeatByID方法中关闭会话，则会出现另一个错误，告知会话已关闭。这是堆栈跟踪：

at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:164)
at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:285)
at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:185)
at ir.ac.shirazu.cse.Terminal.Seat_$$_javassist_9.setTicket(Seat_$$_javassist_9.java)
at ir.ac.shirazu.cse.Database.DB.issueTicket(DB.java:231)

Answer 1

在返回之前尝试关闭proSess中的getSeatByID()。目前Seat确实仍然附加在getSeatByID()中打开的会话。

Answer 2

我遇到了同样的问题。但是在使用单例模式进行会话之后我就完成了。我使用的是Hibernate 4.2.x。

这是我的会话类用于获取数据库事务的会话等。

public class SessionClass {

static Session session = PoolManager.getSession();

public static Session getSession() {
    if (session != null || session.isOpen()) {
        return session;
    } else {
        session = PoolManager.getSession();
        return session;
    }
}

}

Hibernate Helper Class I使用。

public class PoolManager {
private static final SessionFactory sessionFactory;
private static final ServiceRegistry serviceRegistry;

static {
    try {
        // Create the SessionFactory from standard (hibernate.cfg.xml) 
        // config file.
        Configuration configuration = new Configuration();
        configuration.configure();

        serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
        sessionFactory = configuration.buildSessionFactory(serviceRegistry);
    } catch (Throwable ex) {
        // Log the exception. 
        System.err.println("Initial SessionFactory creation failed." + ex);
        throw new ExceptionInInitializerError(ex);
    }
}

public static Session getSession() {
    return sessionFactory.openSession();
}

}

Answer 3

我在尝试关联Envers会话中的实体时遇到了这个问题。

修正了通过“刷新”所述实体（通过PK获取在我的非Envers会话中检索它），然后将其冒泡到我的算法中。

Answer 4

使用session.opensession().get(.....) ..代替session.opensession().load(.....)

Answer 5

如果你在提交proCess之前做了一个proCess.evict（c）怎么办？

Hibernate：非法尝试将代理与两个打开的Sessions关联

5 个答案: