线程“main”java中出现异常。hibernate-OneToOne关系中的lang.NullPointerException？

Question

package com.mallesh.hibernate;

import java.sql.Date;

import org.hibernate.Session;
import org.hibernate.cfg.AnnotationConfiguration;

public class AppTest {

    public static void main(String[] args) {
     System.out.println("Hello Come Here please");
     Session session=new AnnotationConfiguration().configure().buildSessionFactory().openSession();//exception occur in this line
     session.beginTransaction();
     EmployeeDetails employeeDetails=new EmployeeDetails("Kalloli Street","Gokak","Karnataka","India");
     Employee employee=new Employee("MAllesh","Kalloli",new Date(121212),"8792127613");
     employee.setEmployeeDetails(employeeDetails);
     employeeDetails.setEmployee(employee);
     session.save(employee);
     session.beginTransaction().commit();
     session.close();

    }

}

Answer 1

employee.setEmployeeDetails(employeeDetails);  (1)
employeeDetails.setEmployee(employee);         (2)

如果Employee表包含必须设置的EmployeeDetails的FK

employee.setEmployeeDetails(employeeDetails);

所以我认为第（2）行必须删除