B4J Question nullpointer on datepicker

[le_toubib]

hi all
i'm on 3.70
using this code :

Sub dp_pt_spn_dob_FocusChanged (HasFocus As Boolean)

If HasFocus = False Then
Dim date As Long
date = DateTime.DateParse(subDP3.GetDatePickerText(True))

i get this error

Error occurred on line: 288 (Main)
java.lang.NullPointerException
at b4j.example.datepicker._getdatepickertext(datepicker.java:64)
at b4j.example.main._dp_pt_spn_dob_focuschanged(main.java:3085)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:593)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:228)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:158)
at sun.reflect.GeneratedMethodAccessor11.invoke(Unknown Source)

in the line :

date = DateTime.DateParse(subDP3.GetDatePickerText(True))

what am i missing ?

 

[Erel]

What is subDP3?

I recommend you to use B4J v4.0 and use the built-in DatePicker.

 

[le_toubib]

Subdp3 is a datepicker control added in the scene builder .
Very difficult to remake the whole layout from the start using the internal designer. It's huge

 

[rwblinn]

Just for clarity based on this information.
If using B4J v4.00 the DataPicker control events as defined using the JavaFX Scene Builder are not supported anymore.

I did a test using B4J v4.00 and a DatePicker defined using the JavaFX Scene Builder. Events like DatePicker_ValueChanged (Value As Long) are not triggered anymore.

Suggest to mention in the B4J v4.00 Release Notes (and if there would be a workaround to resolve for complex FXML layouts which can not be converted).
There might be more impact examples, like using new views.

 

[Erel]

Can you upload a small program that previously worked properly and now fails?

 

[le_toubib]

solved by changing the last line into :

date = DateTime.DateParse(asJO(dp_pt_spn_dob).RunMethod("getValue",Null))

for some reason initializing the datepicker (subDP3.Initialize(dp_pt_spn_dob, False) ) in appstart was "lost" , so it s not initialized on focus change .