代码如下：

class HibernateTest {

public static void main(final String[] args) {
    final HibernateTest objHibernateTest = new HibernateTest();
    
    objHibernateTest.saveEmployeeDetails();
    
    objHibernateTest.saveEmployeeLeaves();
    
    objHibernateTest.saveEmployeePayment();
}

private void saveEmployeeDetails() {
    final Session session = HibernateUtil.getSessionFactory().getCurrentSession();
    session.getTransaction().begin();//Begin Transaction
    Employee e = new Employee();//consider Employee have data
    session.update(e);
    session.flush();
    session.clear();
}

private void saveEmployeeLeaves() {
    final Session session = HibernateUtil.getSessionFactory().getCurrentSession();
    Employee e = new Employee();//consider Employee have data
    session.save(e);
    session.flush();
    session.clear();
}

private void saveEmployeePayment() {
    final Session session = HibernateUtil.getSessionFactory().getCurrentSession();
    Employee e = new Employee();//consider Employee have data
    session.save(e);
    session.flush();
    session.getTransaction().commit();//Commit Transaction
}
}

在上面的代码中，我首先调用saveEmployeeDetails()，在那里我获得会话并开始事务，然后调用flush() and clear()用于缓存目的。
我在saveEmployeeLeaves()中做了同样的事情。
在函数saveEmployeePayment()中，我执行了一些操作并保存了员工的详细信息。
但是在这个场景中，只有Payment的详细信息存储在db中，而不是Employee details和Leave details。
为什么会这样？