B4J Question strange error

madru · Apr 29, 2022

Hi,

not really sure how I should explain my problem as I can not share the code, lets try....

the app fetches data from a DB and fills a Tableview (not B4XTable) with data in the main form, part of the data are datetime fields from the DB
a 2nd Form holds only a datepicker

the form with the datepicker

B4X:

Sub Class_Globals
    Private fx As JFX
    Private xui As XUI
    Private frm As Form
    Private jrdc As jRDC2
    Private dpIntervalDone As DatePicker
End Sub


Public Sub Initialize (Parent As Form,left As String,top As String,width As String,height As String,titel As String,action As Int)
    If frm.IsInitialized = False Then
        frm.Initialize("frm", 800, 600)
        frm.RootPane.LoadLayout("frmVacation")
        
    End If
          
    Dim ps As Screen = fx.PrimaryScreen
    frm.WindowWidth = width
    frm.WindowHeight = height
    frm.WindowTop = ps.MinY +  (ps.MaxY - frm.WindowHeight) / 2
    frm.WindowLeft = ps.MinX + (ps.MaxX - frm.WindowWidth) / 2
    
    frm.Title=titel
    frm.SetFormStyle("DECORATED")
    frm.Resizable = False

'    frm.SetOwner(Parent)
    jrdc.Initialize
    

End Sub

Public Sub Show' As Paint
    frm.ShowAndWait
    'The next line will only be executed after the form is closed.
End Sub

showing the form is done here

B4X:

            Dim v1 As Vacation
            v1.Initialize(MainForm,(MainForm.WindowLeft+15),(MainForm.windowTop+ 50),(800),(700),"Vacation",0)
            v1.Show

this works as expected the Form does open and the date picker is usable..... BUT

changing the datetime field in the Mainform to a different format like:

B4X:

DateTime.DateFormat = "dd.MM.yy HH:mm"

breaks the App, launching the Form with the datepicker ends with this:

Waiting for debugger to connect...
Program started.

Error occurred on line: 35 (vacation) ====> frm.ShowAndWait
java.time.temporal.UnsupportedTemporalTypeException: Unsupported field: HourOfDay
at java.base/java.time.LocalDate.get0(LocalDate.java:708)
at java.base/java.time.LocalDate.getLong(LocalDate.java:687)
at java.base/java.time.format.DateTimePrintContext.getValue(DateTimePrintContext.java:308)
at java.base/java.time.format.DateTimeFormatterBuilder$NumberPrinterParser.format(DateTimeFormatterBuilder.java:2696)
at java.base/java.time.format.DateTimeFormatterBuilder$CompositePrinterParser.format(DateTimeFormatterBuilder.java:2335)
at java.base/java.time.format.DateTimeFormatter.formatTo(DateTimeFormatter.java:1843)
at java.base/java.time.format.DateTimeFormatter.format(DateTimeFormatter.java:1817)
at javafx.base/javafx.util.converter.LocalDateTimeStringConverter$LdtConverter.toString(LocalDateTimeStringConverter.java:240)
at javafx.base/javafx.util.converter.LocalDateStringConverter.toString(LocalDateStringConverter.java:139)
at javafx.base/javafx.util.converter.LocalDateStringConverter.toString(LocalDateStringConverter.java:45)
at javafx.controls/javafx.scene.control.skin.ComboBoxPopupControl.updateDisplayNode(ComboBoxPopupControl.java:337)
at javafx.controls/javafx.scene.control.skin.DatePickerSkin.getDisplayNode(DatePickerSkin.java:216)
at javafx.controls/javafx.scene.control.skin.ComboBoxBaseSkin.updateDisplayArea(ComboBoxBaseSkin.java:289)
at javafx.controls/javafx.scene.control.skin.ComboBoxBaseSkin.layoutChildren(ComboBoxBaseSkin.java:167)
at javafx.controls/javafx.scene.control.Control.layoutChildren(Control.java:601)
at javafx.graphics/javafx.scene.Parent.layout(Parent.java:1204)
at javafx.graphics/javafx.scene.Parent.layout(Parent.java:1211)
at javafx.graphics/javafx.scene.Scene.doLayoutPass(Scene.java:576)
at javafx.graphics/javafx.scene.Scene.preferredSize(Scene.java:1748)
at javafx.graphics/javafx.scene.Scene$2.preferredSize(Scene.java:393)
at javafx.graphics/com.sun.javafx.scene.SceneHelper.preferredSize(SceneHelper.java:66)
at javafx.graphics/javafx.stage.Window$12.invalidated(Window.java:1086)
at javafx.base/javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:110)
at javafx.base/javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:145)
at javafx.graphics/javafx.stage.Window.setShowing(Window.java:1174)
at javafx.graphics/javafx.stage.Window.show(Window.java:1189)
at javafx.graphics/javafx.stage.Stage.show(Stage.java:273)
at javafx.graphics/javafx.stage.Stage.showAndWait(Stage.java:463)
at anywheresoftware.b4j.objects.Form.ShowAndWait(Form.java:231)
at b4j.example.vacation._show(vacation.java:106)
at b4j.example.main$ResumableSub_MenuBar1_Action.resume(main.java:4012)
at b4j.example.main._menubar1_action(main.java:3318)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:629)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:237)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:167)
at jdk.internal.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:109)
at anywheresoftware.b4a.shell.ShellBA.raiseEvent2(ShellBA.java:98)
at anywheresoftware.b4a.BA$1.run(BA.java:234)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
at java.base/java.lang.Thread.run(Thread.java:834)

i have no idea whats going on, both form are complete separated ......

any help is appreciated

Erel · May 1, 2022

I don't recommend using Form.ShowAndWait. Modal dialogs are bad.

Looks like the error happens when a ComboBox tries to redraw the items.

madru · May 1, 2022

Erel said:
I don't recommend using Form.ShowAndWait. Modal dialogs are bad.

Looks like the error happens when a ComboBox tries to redraw the items.

I am actually rewriting the App to use B4XPages, but how is this redraw error related to the date format - i really don’t understand.

Erel · May 1, 2022

Post the code that fills the combobox.

madru · May 1, 2022

Erel, there is no Combobox in the project.....

skeleton to show the problem attached

Erel · May 1, 2022

1. DatePicker uses the date format set with DateTime.DateFormat.
2. It doesn't support formats with time fields.

madru · May 1, 2022

I really don't get it

if I do this in AppStart

B4X:

Dim t As Long = 1651399607000
DateTime.DateFormat = "dd.MM.yy HH:mm"
Log(DateTime.Date(t))

I get the 01.05.22 12:06 in log

why is this related to the date picker in a different Form where not even a reference is set?

stevel05 · May 1, 2022

The date picker uses the format you've set for the app unless you specifically override it on the date picker.

agraham · May 1, 2022

As Erel wrote DatePicker gets its format from the setting of DateTime.DateFormat which is a globally accessible setting.

madru · May 1, 2022

looks like I am too stu..., can somebody make the example from Post 5 working?

agraham · May 1, 2022

B4X:

    DateTime.DateFormat = "dd.MM.yy"

Again, as Erel said DatePicker does not support formats with time fields.

Mark Read · May 1, 2022

agraham said:
DateTime.DateFormat = "dd.MM.yy"

And the equivalent for the time would be:

B4X:

DateTime.TimeFormat = "HH:mm"

stevel05 · May 1, 2022

If you want a different format in the rest of the app you can set the date format directly on the date picker after the loadlayout.

B4X:

DatePicker1.DateFormat = "dd.MM.yy"

madru · May 1, 2022

oh, boy - no comment

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