com.mysql.jdbc.des exceptions.jdbc4.MySQLIntegrityConstraintViolationexception: la Colonne 'id' ne peut pas être null?

im ayant de la difficulté de l'insertion de données de table de base de données à partir des classes java. Je suis "Internal Exception: com.mysql.jdbc.des exceptions.jdbc4.MySQLIntegrityConstraintViolationexception: la Colonne 'id' ne peut pas être null"... j'ai fait quelques recherches et je ne pouvais pas le comprendre. Permettez-moi de poster mes codes... avant que j'explique ce que je veux faire... Ce projet contient la classe de Servlet,JSP , et des classes java. Je suis l'aide de JSP Formulaire html pour obtenir les données et les enregistre dans une base de données. Codes ici...

    @Entity
    @Table(name="\"Leave\"")
    public class Leave implements Serializable{


/**
 * 
 */
private static final long serialVersionUID = 9088190714759727299L;

@Id
@Column(name="id",nullable=false,updatable=false)
private Long id;

//@OneToOne(mappedBy=)
@GeneratedValue(strategy = GenerationType.AUTO)
@JoinColumn(name = "person_id",referencedColumnName="id")
private Person person;


//@Enumerated(LeaveType)
@Column(name="leavetype")
private LeaveType leavetype;

@Temporal(TemporalType.DATE)
@Column(name="prepdate")
private Date prepdate;

@Temporal(TemporalType.DATE)
@Column(name="startdate")
private Date startdate;

@Temporal(TemporalType.DATE)
@Column(name="enddate")
private Date enddate;

@Temporal(TemporalType.DATE)
@Column(name="oldstartdate")
private Date oldStartdate;

@Temporal(TemporalType.DATE)
@Column(name="oldenddate")
private Date oldEnddate;

@Column(name="workday")
private String workday;

@Column(name="calendarday")
private String calendarday;

@Column(name="reason")
private String reason;

    getters setters....

---

        @Entity
          @Table(name="\"Person\"")
          public class Person implements Serializable {

/**
 * 
 */
private static final long serialVersionUID = 2532993385565282772L;
@Id
@Column(name="id",nullable=false,updatable=false)
@GeneratedValue(strategy = GenerationType.AUTO)

private Long id;
private String name;
private String surname;
private String sskno;
private String workstartdate;
private String address;
private String telno;

@OneToMany
private List<Leave> leaves;

---

ET MA CLASSE DE SERVLET EST....

    @WebServlet("/LeaveServlet")
public class LeaveServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private static final String PERSISTENCE_UNIT_NAME = "EmployeeLeaveForm";
private static EntityManagerFactory emf;
public LeaveServlet() {
super();
}
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
emf = Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME);
EntityManager entityManager =  emf.createEntityManager();
try {
PrintWriter out = response.getWriter();
RequestDispatcher requestDispatcher = request.getRequestDispatcher("/FormInterface.jsp");
Person person = new Person();
Leave leave = new Leave();
DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd");
Date date = new Date();
String choosenType = request.getParameter("leavetype");
//LEAVING
//TYPES---------------------------------------------------------------------------------------------------
if (choosenType == null) {
request.setAttribute("leaveTypeError",
"Izin turunu giriniz.");
requestDispatcher.forward(request, response);
return;
}
else if (choosenType.equals(LeaveType.ANNUAL.toString())) {
leave.setLeavetype(LeaveType.ANNUAL);
} else if (choosenType.equals(LeaveType.MARRIAGE.toString())) {
leave.setLeavetype(LeaveType.MARRIAGE);
} else if (choosenType.equals(LeaveType.FEEDING.toString())) {
leave.setLeavetype(LeaveType.FEEDING);
} else if (choosenType.equals(LeaveType.MEDICAL.toString())) {
leave.setLeavetype(LeaveType.MEDICAL);
} else if (choosenType.equals(LeaveType.MATERNITY.toString())) {
leave.setLeavetype(LeaveType.MATERNITY);
} else if (choosenType.equals(LeaveType.OTHER.toString())) {
leave.setLeavetype(LeaveType.OTHER);
leave.setReason(request.getParameter("reason"));
if (leave.getReason() != null) {
} else if (leave.getReason() == null) {
request.setAttribute("errorNoReason",
"Please enter a reason");
requestDispatcher.forward(request, response);
return;
}
} else if (choosenType.equals(LeaveType.UNPAID.toString())) {
leave.setLeavetype(LeaveType.UNPAID);
leave.setReason(request.getParameter("reason"));
if (leave.getReason() != null) {
} else if (leave.getReason() == null) {
request.setAttribute("errorNoReason",
"Please enter a reason");
requestDispatcher.forward(request, response);
return;
}
}
//PASSING PARAMETERS TO LOCAL
//VARIABLES---------------------------------------------------------------------------
String prepdate = dateFormat.format(date);
String startdate = request.getParameter("startdate");
String enddate = request.getParameter("enddate");
String oldStartdate = request.getParameter("oldStartdate");
String oldEnddate = request.getParameter("oldEnddate");
person.setName(request.getParameter("name"));
person.setSurname(request.getParameter("surname"));
person.setSskno(request.getParameter("sskno"));
person.setworkStartdate(request.getParameter("workStarted"));  //DBden
person.setAddress(request.getParameter("address"));
person.setTelno(request.getParameter("telephone"));
leave.setCalendarday(request.getParameter("calendarday"));
leave.setWorkday(request.getParameter("workday"));
leave.setPrepdate(dateFormat.parse(prepdate));
leave.setStartdate(dateFormat.parse(startdate));
leave.setEnddate(dateFormat.parse(enddate));
leave.setOldStartdate(dateFormat.parse(oldStartdate));
leave.setOldEnddate(dateFormat.parse(oldEnddate));
//Checking the consistency of the
//time----------------------------------------------------------------------------
if (((leave.getEnddate() != null) && (leave.getOldEnddate() != null))) {
entityManager.getTransaction().begin();
entityManager.persist(leave);
entityManager.getTransaction().commit();
//db den return
//info
}
else {
if (leave.getEnddate() == null) {
request.setAttribute("errorMessage1", "Please enter dates correctly");
}
if (leave.getOldEnddate() == null) {
request.setAttribute("errorMessage2", "Please enter date correctly");
}
requestDispatcher.forward(request, response);
}
} catch (Throwable exc) {
System.out.println(exc);
}
finally {
//Close the database connection:
if (entityManager.getTransaction().isActive())
entityManager.getTransaction().rollback();
entityManager.close();
}
}
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
}
}

---

Et les erreurs...

        [EL Info]: 2013-07-29 10:05:47.872--ServerSession(76232710)--EclipseLink, version: Eclipse Persistence Services - 2.5.0.v20130507-3faac2b
[EL Info]: connection: 2013-07-29 10:05:48.207--ServerSession(76232710)--file:/C:/Users/VAIO/Desktop/workspace - Kopya/.metadata/.plugins/org.eclipse.wst.server.core/tmp1/wtpwebapps/EmployeeLeaveForm/WEB-INF/classes/_EmployeeLeaveForm login successful
[EL Warning]: 2013-07-29 10:05:48.292--UnitOfWork(1213364484)--Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'id' cannot be null
Error Code: 1048
Call: INSERT INTO `Leave` (id, calendarday, enddate, leavetype, oldenddate, oldstartdate, prepdate, reason, startdate, workday, person_id) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
bind => [11 parameters bound]
Query: InsertObjectQuery(com.eteration.leavesystem.model.Leave@4fff5f4f)
javax.persistence.RollbackException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'id' cannot be null
Error Code: 1048
Call: INSERT INTO `Leave` (id, calendarday, enddate, leavetype, oldenddate, oldstartdate, prepdate, reason, startdate, workday, person_id) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
bind => [11 parameters bound]
Query: InsertObjectQuery(com.eteration.leavesystem.model.Leave@4fff5f4f)

J'ai aussi utiliser mysql et j'ai créé une table de base de données.

POURQUOI suis-je de ces exceptions.. Et sérieusement j'ai fait creuser, mais rien de travailler pour moi svp aider moi merci...

EDIT-

    [EL Info]: 2013-07-29 11:05:56.944--ServerSession(624062858)--EclipseLink, version: Eclipse Persistence Services - 2.5.0.v20130507-3faac2b
[EL Info]: connection: 2013-07-29 11:05:57.283--ServerSession(624062858)--file:/C:/Users/VAIO/Desktop/workspace - Kopya/.metadata/.plugins/org.eclipse.wst.server.core/tmp1/wtpwebapps/EmployeeLeaveForm/WEB-INF/classes/_EmployeeLeaveForm login successful
[EL Warning]: 2013-07-29 11:05:57.362--ClientSession(72318077)--Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'eteration.sequence' doesn't exist
Error Code: 1146
Call: UPDATE SEQUENCE SET SEQ_COUNT = SEQ_COUNT + ? WHERE SEQ_NAME = ?
bind => [2 parameters bound]
Query: DataModifyQuery(name="SEQUENCE" sql="UPDATE SEQUENCE SET SEQ_COUNT = SEQ_COUNT + ? WHERE SEQ_NAME = ?")
Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'eteration.sequence' doesn't exist
Error Code: 1146
Call: UPDATE SEQUENCE SET SEQ_COUNT = SEQ_COUNT + ? WHERE SEQ_NAME = ?
bind => [2 parameters bound]
Query: DataModifyQuery(name="SEQUENCE" sql="UPDATE SEQUENCE SET SEQ_COUNT = SEQ_COUNT + ? WHERE SEQ_NAME = ?")