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Exception in thread "AWT-EventQueue-0" java.lang.UnsatisfiedLinkError: /lib/libFrameBufferJNI.so: /lib/libFrameBufferJNI.so: cannot open shared object file: No such file or directory (Possible cause: can't load ARM-bit .so on a IA 32-bit platform)
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary1(ClassLoader.java:1965)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1890)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1880)
at java.lang.Runtime.loadLibrary0(Runtime.java:849)
at java.lang.System.loadLibrary(System.java:1088)
at demoframebuffer.FrameBuffer.(FrameBuffer.java:75)
at demoframebuffer.TestFrameBuffer.(TestFrameBuffer.java:35)
at demoframebuffer.TestFrameBuffer$2.run(TestFrameBuffer.java:145)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:694)
at java.awt.EventQueue$3.run(EventQueue.java:692)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

GOOD!

I know this is old code but I was able to use it with Java 11 on RPI 3+ with Buster.

I found this c code for hiding/unhiding the cursor. Is there are way to implement this into your code? Or is there something already implemented in your code that I missed?

void fbcon_cursor (int blank)
{
int fd = open("/dev/tty1", O_RDWR);
if(0 < fd)
{
write(fd, "\033[?25", 5);
write(fd, blank ? "h" : "l", 1);
}
close(fd);
}

void fbcon_blank (int blank)
{
ioctl(fb.fd, FBIOBLANK, blank ? VESA_POWERDOWN: VESA_NO_BLANKING);
return;
}

where fb.fd is the fd for /dev/fb0. Works for me, anyway.