如何正确配置Hibernate

用于执行任务的DataFetcher.java

public class HibernateSession {

    private static final SessionFactory sessionFactory;

    static {
        try {

            sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();
        } catch ( Throwable ex ) {
            // Log the exception.
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }

    public static SessionFactory getSessionFactory()
      {
        return sessionFactory;
      }
}

如何正确配置Hibernate？我做的每一笔交易都有almogs的问题！

---

在本例中，我得到“信息：非法尝试将集合与两个打开的会话关联”。当我

更改会话时，保存（m）；到session.merge（m）只要我在同一页上，它就会工作。当我更改页面，然后返回页面时，会出现很多异常
 不要将会话对象存储在数据获取程序中。那不是个好主意。每个会话都绑定到一个事务，该事务绑定到它的线程。我不确定这段代码是否在容器中运行，但如果是这样，hibernate将尝试使用范围内事务管理器，您的代码将因此而混淆。将您的代码更改为以下内容，然后查看是否有任何更改


公共类数据获取程序{

 public class DataFetcher {

        Session session;

        public DataFetcher()
          {
            session = HibernateSession.getSessionFactory().getCurrentSession();
          }

        public void Save(Marki m)
          {
            org.hibernate.Transaction tx = session.beginTransaction();
            session.save(m);
            session.getTransaction().commit();

          }
    }

ManagedBean(name="dodaj")
@ViewScoped
public class DodajOferte implements Serializable {

    private Marki marka;

    public DodajOferte()
      {

        marka = new Marki();
      }

    public String Dodaj()
      {

        DataFetcher f = new DataFetcher();

        try {
            f.Save(marka);
        } catch ( HibernateException ex ) {
            System.out.println(ex.getMessage().toString());

            FacesMessage message = new FacesMessage("err");
            FacesContext context = FacesContext.getCurrentInstance();
            context.addMessage(null, message);
            return null;
        }
        return null;

      }

    public Marki getMarka()
      {
        return marka;
      }

    public void setMarka(Marki marka)
      {
        this.marka = marka;
      }
}

看起来合并不再有效。
 public class DataFetcher {

        Session session;

        public DataFetcher()
          {
            session = HibernateSession.getSessionFactory().getCurrentSession();
          }

        public void Save(Marki m)
          {
            org.hibernate.Transaction tx = session.beginTransaction();
            session.save(m);
            session.getTransaction().commit();

          }
    }

ManagedBean(name="dodaj")
@ViewScoped
public class DodajOferte implements Serializable {

    private Marki marka;

    public DodajOferte()
      {

        marka = new Marki();
      }

    public String Dodaj()
      {

        DataFetcher f = new DataFetcher();

        try {
            f.Save(marka);
        } catch ( HibernateException ex ) {
            System.out.println(ex.getMessage().toString());

            FacesMessage message = new FacesMessage("err");
            FacesContext context = FacesContext.getCurrentInstance();
            context.addMessage(null, message);
            return null;
        }
        return null;

      }

    public Marki getMarka()
      {
        return marka;
      }

    public void setMarka(Marki marka)
      {
        this.marka = marka;
      }
}

    public void Save(Marki m)
      {
        Session session = HibernateSession.getSessionFactory().getCurrentSession();
        org.hibernate.Transaction tx = session.beginTransaction();
        session.save(m);
        session.getTransaction().commit();

      }
}