从 Hibernate 3 迁移到 Hibernate 4 不断获取不支持的嵌套事务

Question

在我们将应用程序从 hibernate3 迁移到 hibernate4 前一周，在 hibernate3 中一切正常，但是在迁移到 hibernate4 之后。我不断收到不支持嵌套事务。

下面是我调用 dao 的服务层

public class LeaveApplicationService implementsSerializable,LeaveApplicationInterfaceService{
    @Autowired
    private LeaveApplicationInterfaceDao _leavApplicationInterfaceDao;
       //getter setter
    @Override
    public synchronized void clickOnAddLeaveButton(LeaveApplicationViewBean leaveApplicationViewBean) {
    SessionFactory sessionFactory=(SessionFactory) ObjectFactory.getBean("sessionFactory");
    sessionFactory.getCurrentSession().beginTransaction();


        try{
                leaveApplicationViewBean.get_employeeListObj().clear();
                leaveApplicationViewBean.get_leaveTypelist().clear();
                leaveApplicationViewBean.get_leaveApproveers().clear();
                //leaveApplicationViewBean.set_employeeListObj(get_leavApplicationInterfaceDao().getEmployeeList());
                leaveApplicationViewBean.set_leaveTypelist(get_leavApplicationInterfaceDao().getLeaveType());
                leaveApplicationViewBean.set_leaveApproveers(get_leavApplicationInterfaceDao().getLeaveApprover(CmsUtil.getSession("userId").toString()));

        }catch(Exception e){
            CmsLogger.errorLog(LeaveApplicationService.class, e);
        }finally{
            sessionFactory.getCurrentSession().close();
        }
}

道层

public class LeaveApplicationDao extends TransactionService implements Serializable,LeaveApplicationInterfaceDao{
    private static final long serialVersionUID = 6237725881698448330L;

    public List<LeaveApprover> getLeaveApprover(String userId) throws Exception {
      List<LeaveApprover> _leavApprovers=new ArrayList<LeaveApprover>();
      Iterator it=getSessionFactory().getCurrentSession().createQuery(sql.toString()).setParameter("practiceAreaId",CmsUtil.getSession("practiceAreaId").toString())                                            .setParameter("userId",userId).setCacheable(true)
                                                                                    .list().iterator();
      while(it.hasNext()){
        Object[] obj=(Object[]) it.next();
        LeaveApprover leaveApprover=new LeaveApprover();
        leaveApprover.set_approverId((String) obj[0]);
        leaveApprover.set_approverName((String) obj[1]);
        _leavApprovers.add(leaveApprover);
    }

    return _leavApprovers;
}



public List<TimeProjectCategory> getLeaveType() throws Exception{
    List<TimeProjectCategory> timeProjectCategories=new ArrayList<TimeProjectCategory>();
    Iterator it =getSessionFactory().getCurrentSession().createQuery(sql.toString()).setCacheable(true).list().iterator();
        while(it.hasNext()){
            Object[] obj=(Object[]) it.next();
            TimeProjectCategory category=(TimeProjectCategory) ObjectFactory.getBean("domainTimeProjectCategoryObj");
            category.getProjectId().set_projectId((String) obj[0]);
            category.setTimeCategory((String) obj[1]);
            category.setTimeProjectCategoryId((String) obj[2]);
            timeProjectCategories.add(category);
        }


    return timeProjectCategories;

}

}

还有我的 TransactionService 类

public class TransactionService{
/**
 * 
 */
private static final long serialVersionUID = 3747504246445270484L;

@Autowired
private DataSource dataSource;

@Autowired
private SessionFactory sessionFactory;
public SessionFactory getSessionFactory() {
    return sessionFactory;
}
public void setSessionFactory(SessionFactory sessionFactory) {
    this.sessionFactory = sessionFactory;
}


public DataSource getDataSource() {
    return dataSource;
}
public void setDataSource(DataSource dataSource) {
    this.dataSource = dataSource;
}


}

我在堆栈跟踪中看到的异常是

Stack Trace for the code

我的 db.xml

db.xml file

Answer 1

有两种可能：

在会话关闭时打开事务的实现定义行为：

确保在关闭连接之前提交（或回滚，与只读无关）事务。 Hibernate Session.close() 关闭底层连接； http://docs.oracle.com/javase/6/docs/api/java/sql/Connection.html#close%28%29 声明事务打开时的行为是实现定义的（即，一些实现会自动关闭事务，其他实现可能会引用计数连接并保持打开状态）。

一般模式是：

try {
    Transaction t = sessionFactory.getCurrentSession().beginTransaction();
    try {
        // do work
        t.commit();
    } catch (Exception e) { 
        t.rollback();
        throw e;
    }
} finally {
    sessionFactory.getCurrentSession().close();
}

之前的交易仍然有效：

如果之前的交易在其他地方仍然处于活动状态，您可以这样做：

Transaction t = session.getTransaction();
if (t == null || !t.isActive()) 
    t = session.beginTransaction();

// then use t (or session's current transaction, same thing)

或者，如果您没有传递Transaction：

if (session.getTransaction() == null || !session.getTransaction().isActive())
    session.beginTransaction();

// then use session's current transaction

但您可能仍想检查您的代码，以查看在给定连接上还有哪些事务正在打开。