JPA/Hibernate事务问题

我希望我能用选项表生成主键，但我不明白为什么事务不能工作。 这是我的环境（这是一个示例，不是真正的应用程序，但更容易解释）：

SGBD:MySql

数据库：用于生成主键的emp、作业、部门（Oracle示例）和PKEY

ORM:JPA与Hibernate

企业应用程序：EmployeeJPA，包含两个模块：EmployeeJPA ejb和EmployeeJPA war

EJB实体：雇员

@Entity
@Table(name = "employee")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "Employee.findAll", query = "SELECT e FROM Employee e"),
    @NamedQuery(name = "Employee.findByEmployeeId", query = "SELECT e FROM Employee e WHERE e.employeeId = :employeeId"),
    @NamedQuery(name = "Employee.findByName", query = "SELECT e FROM Employee e WHERE e.name = :name"),
    @NamedQuery(name = "Employee.findByManagerId", query = "SELECT e FROM Employee e WHERE e.managerId = :managerId"),
    @NamedQuery(name = "Employee.findByHiredate", query = "SELECT e FROM Employee e WHERE e.hiredate = :hiredate"),
    @NamedQuery(name = "Employee.findBySalary", query = "SELECT e FROM Employee e WHERE e.salary = :salary")})
public class Employee implements Serializable {

    private static final long serialVersionUID = 1L;
    @Id
    @TableGenerator(name="EmployeePk", table="pkeys", pkColumnName="pkey_id",
            valueColumnName="pkey_val", pkColumnValue="EMPLOYEE", allocationSize=1)
    @GeneratedValue(strategy=GenerationType.TABLE, generator="EmployeePk")    
    @Basic(optional = false)
    @NotNull
    @Column(name = "employee_id")
    private Integer employeeId;
    . . .

EJB会话EmployeeFacade

@Stateless
@LocalBean
@TransactionManagement(TransactionManagementType.CONTAINER)
public class EmployeeFacade {
    @PersistenceContext(unitName = "EmployeesJPA-ejbPU")
    private EntityManager em;
    @EJB
    JobFacade jobFacade;
    @EJB
    DepartmentFacade departmentFacade;

    @TransactionAttribute(TransactionAttributeType.REQUIRED)
    public void addEmployee(String name, Date hiredate, double salary, int jobId, int departmentId, int managerId) throws Exception {
        Employee employee = new Employee();
        try{
            Department department = departmentFacade.getDepartmentById(departmentId);
            Job job = jobFacade.getJobById(jobId);
            employee.setDepartment(department);
            employee.setJob(job);
            employee.setHiredate(hiredate);
            employee.setManagerId(managerId);
            employee.setName(name);
            em.persist(employee);
        }catch(Exception ex){
            throw ex;
        }
    }
}

Servlet SrvlEmployee

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    String error = null;
    try {
        Date hiredate = Utilitaire.StrToDate("2020-02-01", "yyyy-MM-dd");
        employeeFacade.addEmployee("Smith", hiredate, 2000.00, 2, 3, 4);
    } catch (Exception e) {
        error = Utilitaire.getExceptionCause(e);
    } finally {
        request.setAttribute("errorR", error);
        RequestDispatcher dsp = request.getRequestDispatcher("/index.jsp");
        dsp.forward(request, response);
    }
}

桌子摆在前面

桌子在后面

表employee的最后一个id是14

请求返回错误消息：

Hibernate：选择department0\u.department\u id作为Department1\u 0\u 0\u，department0\u.dname作为dname2\u 0\u，department0\u.location作为location3\u 0\u来自department0\u，其中department0\u.department\u id=

休眠：从job job0中选择job0。job_id作为job_id1_2_0，job0。jobname作为jobname2_2_0，其中job0。job_id=

Hibernate：从pkeys中选择pkey_val，其中pkey_id='EMPLOYEE'进行更新

Hibernate:更新pkeys set pkey_val=？其中pkey_val=？而pkey_id='EMPLOYEE'

Hibernate：插入员工（部门id、雇用日期、职务id、经理id、姓名、工资、员工id）值（？、、、、、、、、？）

SQL错误：1062，SQLState:23000

键“PRIMARY”的重复条目“14”

似乎不仅有一笔交易，还有两笔交易，但我不明白为什么！ 我的错误在哪里？

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谢谢你的帮助

这在EclipseLink和j2ee.platform 1.6中运行良好！！！？？？有人会反抗吗？还有j2ee.1.7平台