B4J Question B4JPackager and "WARNING: An illegal reflective access operation has occurred"

Please post the full output from run_debug.bat.

Running from B4J UI the warning is also present in the log area but the program keeps working fine. Not the case with the EXE. Here is the output from run_debug.bat:

Recibo RED 63
PROM 1
Fin de Newdata RED
IRR Instantáneo 154
main._beep (java line: -1)
java.lang.IllegalAccessException: class anywheresoftware.b4j.object.JavaObject (in module b4j) cannot access class sun.awt.windows.WToolkit (in module java.desktop) because module java.desktop does not export sun.awt.windows to module b4j
at java.base/jdk.internal.reflect.Reflection.newIllegalAccessException(Unknown Source)
at java.base/java.lang.reflect.AccessibleObject.checkAccess(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at b4j/anywheresoftware.b4j.object.JavaObject.RunMethod(Unknown Source)
at b4j/b4j.example.main._beep(Unknown Source)
at b4j/b4j.example.main._timer_principal_tick(Unknown Source)
at jdk.internal.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at b4j/anywheresoftware.b4a.BA.raiseEvent2(Unknown Source)
at b4j/anywheresoftware.b4a.objects.Timer$TickTack$1.run(Unknown Source)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(Unknown Source)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(Unknown Source)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)


C:\Fuentes\Basic4Mac\ZiECG_JV\Objects\temp\build\bin>pause
Presione una tecla para continuar . . .

Best to upload a small project that demonstrates it.

I found the problem! Now, is there a solution?
The warning is issued the first time the beep routine is called:

drponciano said:

I found the problem! Now, is there a solution?
The warning is issued the first time the beep routine is called:

B4X:

Sub Beep
   Dim jo As JavaObject
   jo.InitializeStatic("java.awt.Toolkit")
   Dim toolkit As JavaObject = jo.RunMethod("getDefaultToolkit", Null)
   toolkit.RunMethod("beep", Null)
End Sub

Click to expand...

Hi @drponciano,
just a curiosity of mine ... why are you using the toolkit's beep method to reproduce the sound?

Nicola Ciaramellano said:

Hi @drponciano,
just a curiosity of mine ... why are you using the toolkit's beep method to reproduce the sound?

Click to expand...

Yes, thas was one method sugested by Erel long time ago ?. It's working fine, but now... Any suggestion?

If you don't want use mediaplayer, have you tried this: http://stackoverflow.com/questions/30377129/playing-audio-on-raspberry-pi-with-java
also suggested by Erel

Change your code to:

Just out of curiosity why does the inline Java work when the apparently identical JavaObject code doesn't? Something not public or am I missing the obvious?

Nothing obvious here.

It is related to getDefaultTookit returning sun.awt.windows.WToolkit which is public by itself but is from a closed module.