B4J Question B4J GUI apps not supported anymore on RPi4?

[sorex]

Hello,

I received a new Raspberry Pi 4B today at work and installed everything by following the 11.0.1 guidelines.

But when I tried to run a B4J GUI app (empty and printing a log line) I get the errors you see below.

Also the VNC connection totally freezes as long as the java application runs.

The only cure is pulling out the power or using SSH to kill the java process with the highest process ID.

Anyone else who had this problem?

The console app doesn't have any issues or errors tho.
I first thought it didn't work either as I didn't see anything appearing in the console windows of the bridge.
But it appears when running it manually.

Exception in thread "Event Thread"
java.lang.NullPointerException
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.X11Cursor.<init>(X11Cursor.java:52)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.X11WarpingCursor.<init>(X11WarpingCursor.java:31)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.X11Platform.createCursor(X11Platform.java:67)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.NativePlatform.getCursor(NativePlatform.java:92)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.MouseInput.setState(MouseInput.java:128)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.MonocleApplication.staticScreen_getScreens(MonocleApplication.java:235)
~e:
    at javafx.graphics/com.sun.glass.ui.Screen.initScreens(Screen.java:412)
~e:
    at javafx.graphics/com.sun.glass.ui.Application.lambda$run$1(Application.java:152)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.RunnableProcessor.runLoop(RunnableProcessor.java:92)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.RunnableProcessor.run(RunnableProcessor.java:51)
~e:
    at java.base/java.lang.Thread.run(Thread.java:834)
~e:
Exception in thread "Event Thread"
java.lang.NullPointerException
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.X11Cursor.<init>(X11Cursor.java:52)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.X11WarpingCursor.<init>(X11WarpingCursor.java:31)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.X11Platform.createCursor(X11Platform.java:67)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.NativePlatform.getCursor(NativePlatform.java:92)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.MonocleApplication.staticCursor_setVisible(MonocleApplication.java:178)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.MonocleApplication.updateDeviceFlags(MonocleApplication.java:97)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.MonocleApplication.lambda$new$1(MonocleApplication.java:77)
~e:
    at javafx.base/com.sun.javafx.collections.SetListenerHelper$SingleChange.fireValueChangedEvent(SetListenerHelper.java:163)
~e:
    at javafx.base/com.sun.javafx.collections.SetListenerHelper.fireValueChangedEvent(SetListenerHelper.java:72)
~e:
    at javafx.base/com.sun.javafx.collections.ObservableSetWrapper.callObservers(ObservableSetWrapper.java:128)
~e:
    at javafx.base/com.sun.javafx.collections.ObservableSetWrapper.add(ObservableSetWrapper.java:269)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.LinuxInputDeviceRegistry.addDeviceInternal(LinuxInputDeviceRegistry.java:104)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.LinuxInputDeviceRegistry.createDevice(LinuxInputDeviceRegistry.java:83)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.LinuxInputDeviceRegistry.lambda$new$0(LinuxInputDeviceRegistry.java:55)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.Udev$1.run(Udev.java:107)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.RunnableProcessor.runLoop(RunnableProcessor.java:92)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.RunnableProcessor.run(RunnableProcessor.java:51)
~e:
    at java.base/java.lang.Thread.run(Thread.java:834)
~e:
Exception in thread "Event Thread"
java.lang.NullPointerException
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.X11Cursor.<init>(X11Cursor.java:52)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.X11WarpingCursor.<init>(X11WarpingCursor.java:31)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.X11Platform.createCursor(X11Platform.java:67)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.NativePlatform.getCursor(NativePlatform.java:92)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.MonocleApplication.staticCursor_setVisible(MonocleApplication.java:178)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.MonocleApplication.updateDeviceFlags(MonocleApplication.java:97)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.MonocleApplication.lambda$new$1(MonocleApplication.java:77)
~e:
    at javafx.base/com.sun.javafx.collections.SetListenerHelper$SingleChange.fireValueChangedEvent(SetListenerHelper.java:163)
~e:
    at javafx.base/com.sun.javafx.collections.SetListenerHelper.fireValueChangedEvent(SetListenerHelper.java:72)
~e:
    at javafx.base/com.sun.javafx.collections.ObservableSetWrapper.callObservers(ObservableSetWrapper.java:128)
~e:
    at javafx.base/com.sun.javafx.collections.ObservableSetWrapper.add(ObservableSetWrapper.java:269)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.LinuxInputDeviceRegistry.addDeviceInternal(LinuxInputDeviceRegistry.java:104)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.LinuxInputDeviceRegistry.createDevice(LinuxInputDeviceRegistry.java:83)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.LinuxInputDeviceRegistry.lambda$new$0(LinuxInputDeviceRegistry.java:55)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.Udev$1.run(Udev.java:107)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.RunnableProcessor.runLoop(RunnableProcessor.java:92)
~e:
    at javafx.graphics/com.sun.glass.ui.monocle.RunnableProcessor.run(RunnableProcessor.java:51)
~e:
    at java.base/java.lang.Thread.run(Thread.java:834)
~e:

 

[EnriqueGonzalez]

installed everything by following the 11.0.1 guidelines.

What jdk are you using? The only ones that are working as of today are the bellsoft full jdks
https://bell-sw.com/pages/liberica-release-notes-11.0.7-for-Embedded/

Java Download | Java 8, Java 11, Java 17, Java 21, Java 22 - OpenJDK Builds for Linux, Windows & macOS

Download Liberica JDK, supported OpenJDK builds. Open source Java 8, 11 and more for Linux, Windows, macOS.

bell-sw.com

 

[sorex]

that's the one I'm using, Enrique.

but the 11.0.1 one as in Erel's guide.

 

[sorex]

google found me this B4X thread

Liberica 11.0.11 full JDK install problem in Raspberry Pi 4b

Good evening everyone, I tried to install Liberica 11 from their site (I also tried with 16) in Raspberry Pi 4b. I have read that the full JDK includes the JavaFX too to run UI applications in Raspberry Pi. I failed big time. I followed the installation instructions as described here...

www.b4x.com

I will give that a try

 

[sorex]

went through all passes without problems but when I run the bridge with it and compile an empty app I get this in the log

Error: --add-modules= requires modules to be specified

and the process just exits

 

[sorex]

ok, that was a silly thing...

make sure you change the drop down option from "Standard" to "Full" on the Bell JDK download page.

now the GUI appears without problems