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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