Your problem seems to be related to this open gwt issue:
http://code.google.com/p/google-web-toolkit/issues/detail?id=4976
Please star the issue to raise its attention. The workaround is not
using 1:n relationships with GWT + GAE + JDO.
Cheers,
Fred
On 26 Aug., 23:12, hampole <rhamp...@gmail.com> wrote:
> I am trying to develop GAE application. I am using the latest GWT
> SDK(2.0.4) AND App Engine SDK(1.3.6) on Eclipse3.4. I am having
> problem in saving a child object "Appointment" and the parent object
> is "Employee". Each Employee has many appointments and and each
> appointment has one employee associated with. I have pasted the Client
> code and the server code here. Please help and see what I am missing
> here. I tried many different ways without success. When I retrieve the
> appointments, the employee is always null. I appreciate any help or
> some example that I can try. Thanks.
>
> //Client code
> public class AppointmentCreateWidget extends Composite {
>
> private static AppointmentCreateWidgetUiBinder uiBinder = GWT
> .create(AppointmentCreateWidgetUiBinder.class);
>
> interface AppointmentCreateWidgetUiBinder extends
> UiBinder<Widget, AppointmentCreateWidget> {
> }
>
> @UiField Button btnSaveAppointment;
> @UiField TextBox tbxSubject;
> @UiField ListBox lbxRoom;
> @UiField ListBox lbxHost;
> @UiField DateBox dbAppointStartDate;
> @UiField DateBox dbAppointEndDate;
> @UiField ListBox lbxStartTimeHr;
> @UiField ListBox lbxEndTimeHr;
> @UiField ListBox lbxStartTimeMi;
> @UiField ListBox lbxEndTimeMi;
>
> private final AppointmentServiceAsync appointService =
> (AppointmentServiceAsync) GWT.create(AppointmentService.class);
> private final List<Visitor> visitors = new ArrayList<Visitor>();
>
> public AppointmentCreateWidget() {
> initWidget(uiBinder.createAndBindUi(this))
> }
>
> @UiHandler("btnSaveAppointment")
> void onClick(ClickEvent e) {
> addAppointment();
> }
>
> private void addAppointment() {
> String subject = tbxSubject.getText().toUpperCase().trim();
> Date startdate = dbAppointStartDate.getValue();
> Date enddate = dbAppointEndDate.getValue();
> String starttime =
> lbxStartTimeHr.getValue(lbxStartTimeHr.getSelectedIndex()).toString()
> +
> lbxStartTimeMi.getValue(lbxStartTimeMi.getSelectedIndex());
> String endtime =
> lbxEndTimeHr.getValue(lbxEndTimeHr.getSelectedIndex()).toString() +
> lbxEndTimeMi.getValue(lbxEndTimeMi.getSelectedIndex());
> String room =
> lbxRoom.getValue(lbxRoom.getSelectedIndex()).toString();
> String key = lbxHost.getValue(lbxHost.getSelectedIndex());
> DateTimeFormat dateFormat = DateTimeFormat.getShortDateFormat();
>
> try {
> createAppointment(subject, startdate, enddate, starttime,
> endtime, key, visitors);
> }
> catch(Exception ex) {
> Window.alert("Save Appointment failed: " + ex.toString());
> }
> }
>
> private void createAppointment(String subject, Date startdate, Date
> enddate, String starttime, String endtime, String empID, List<Visitor>
> visitor) {
> appointService.addAppointment(subject,startdate, enddate,
> starttime, endtime, empID, visitor, new AsyncCallback<Void>() {
> public void onFailure(Throwable error) {
> Window.alert("Unable to create Appointment." +
> error.getMessage());
> }
> public void onSuccess(Void ignore) {
> }
> });
> }
>
> }
>
> //ServiceImpl
> public class AppointmentServiceImpl extends RemoteServiceServlet
> implements AppointmentService {
> /**
> *
> */
> private static final long serialVersionUID = 1L;
>
> public void addAppointment(String subject, Date appointStartDate,
> Date appointEndDate, String startTime, String endTime, String empID,
> List<Visitor> visitors) throws NotLoggedInException {
> PersistenceManager pm = getPersistenceManager();
> //get employee
> Employee emp = pm.getObjectById(Employee.class, empID);
>
> Appointment newAppoint = new Appointment(subject,
> appointStartDate, appointEndDate, startTime, endTime);
> newAppoint.setVisitors(visitors);
> newAppoint.setEmployee(emp);
> emp.getAppointments().add(newAppoint);
>
> try {
> pm.makePersistent(emp);
> } finally {
> pm.close();
> }
> }
>
> private PersistenceManager getPersistenceManager() {
> return PMF.get().getPersistenceManager();
> }
>
> }
>
> //Employee Bean
> @PersistenceCapable(identityType = IdentityType.APPLICATION,
> detachable = "true")
> public class Employee implements IsSerializable, IValidatable {
>
> @PrimaryKey
> @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
> @Extension(vendorName="datanucleus", key="gae.encoded-pk",
> value="true")
> private String employeeKey;
>
> @NotEmpty(message="You must specify First Name")
> @Length(minimum=3)
> @Persistent
> private String firstName;
>
> @NotEmpty(message="You must specify Last Name")
> @Length(minimum=3)
> @Persistent
> private String lastName;
>
> @Persistent
> private String title;
>
> @NotEmpty(message="You must specify Email Address")
> @Length(minimum=3)
> @Persistent
> private String email;
>
> @Persistent
> private String department;
>
> @Persistent
> private String phone;
>
> @Persistent
> private String extension;
>
> @Persistent
> private String companyName;
>
> @Persistent(mappedBy = "employee")
> @Element(dependent = "true")
> private List<Appointment> appointments;
>
> public Employee(String firstName, String lastName, String title,
> String email,
> String phone, String extension, String department, String
> companyName) {
> this();
> this.firstName = firstName;
> this.lastName = lastName;
> this.title = title;
> this.email = email;
> this.department = department;
> this.phone = phone;
> this.extension = extension;
> this.companyName = companyName;
> }
>
> //getters and setters
>
> }
>
> //Appointment Bean
> @PersistenceCapable(identityType = IdentityType.APPLICATION,
> detachable = "true")
> public class Appointment implements IsSerializable, IValidatable {
>
> @PrimaryKey
> @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
> @Extension(vendorName="datanucleus", key="gae.encoded-pk",
> value="true")
> private String appointKey;
>
> @Persistent
> private String subject;
>
> @NotEmpty(message="You must specify Start Time")
> @Persistent
> private String startTime;
>
> @NotEmpty(message="You must specify End Time")
> @Persistent
> private String endTime;
>
> @NotEmpty(message="You must specify Start Date")
> @Persistent
> private Date appointmentStartDate;
>
> @NotEmpty(message="You must specify End Date")
> @Persistent
> private Date appointmentEndDate;
>
> @Persistent
> private Employee employee;
>
> @Persistent
> private List<Visitor> visitors = new ArrayList<Visitor>();
>
> public Appointment(String subject, Date appointStartDate, Date
> appointEndDate, String startTime, String endTime, Employee employee,
> List<Visitor> visitors)
> {
> this();
> this.subject = subject;
> this.startTime = startTime;
> this.endTime = endTime;
> this.appointmentStartDate = appointStartDate;
> this.appointmentEndDate = appointEndDate;
> this.employee = employee;
> this.visitors = visitors;
> }
>
> //getters and setters
>
> }
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