v3.6 crashes attempting to run example apps in fullscreen with LWJGL v2

[stephengold]

Investigating a possible regression in JME v3.6.0-alpha1, I tried to run some of the apps in jme3-examples in fullscreen mode ... for example jme3test.helloworld.HelloJME3 (though I ran into identical behavior with other example apps). Here's what happens:

• The display settings dialog appears with "Fullscreen" not checked and "Refresh Rate" blank.
• I check the box for "Fullscreen".
• The "Screen Resolution" changes to1920x1080 and the "Refresh Rate" changes to 55 Hz. Unfortunately, 55 Hz isn't a valid refresh rate for my display adapter. I believe the valid rates are 24, 30, and 60 Hz.
• When I try to select a different refresh rate, there are only 6 available options: 50 Hz, 51 Hz, 52 Hz, 53 Hz, 54 Hz, and 55 Hz. None of these are valid rates.
• After I click the "Continue" button, I get two "Error in Application" dialogs and the app crashes.

The console output is:

Jan 03, 2023 10:59:04 AM com.jme3.system.JmeDesktopSystem initialize
INFO: Running on jMonkeyEngine 3.6.0-alpha1
 * Branch: master
 * Git Hash: 5b9fc87
 * Build Date: 2023-01-03
Jan 03, 2023 10:59:05 AM com.jme3.app.LegacyApplication handleError
SEVERE: Failed to create display
java.lang.RuntimeException: Unable to find fullscreen display mode matching settings
	at com.jme3.system.lwjgl.LwjglDisplay.createContext(LwjglDisplay.java:80)
	at com.jme3.system.lwjgl.LwjglAbstractDisplay.initInThread(LwjglAbstractDisplay.java:120)
	at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:221)
	at java.base/java.lang.Thread.run(Thread.java:833)

Jan 03, 2023 10:59:05 AM com.jme3.app.LegacyApplication handleError
SEVERE: Uncaught exception thrown in Thread[jME3 Main,5,main]
java.lang.IllegalMonitorStateException: current thread is not owner
	at java.base/java.lang.Object.notifyAll(Native Method)
	at com.jme3.system.lwjgl.LwjglAbstractDisplay.initInThread(LwjglAbstractDisplay.java:135)
	at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:221)
	at java.base/java.lang.Thread.run(Thread.java:833)


Exception: java.lang.NullPointerException thrown from the UncaughtExceptionHandler in thread "jME3 Main"

Excerpt from glxinfo (to document my graphics configuration):

OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: GeForce GT 545/PCIe/SSE2
OpenGL core profile version string: 4.6.0 NVIDIA 390.157
OpenGL core profile shading language version string: 4.60 NVIDIA

This was with "jme3-lwjgl" (LWJGL v2, which is currently the default jme3-examples build). Here's what happened when I switched the build to use "jme3-lwjgl3" (LWJGL v3):

• The display settings dialog appears with "Fullscreen" not checked and "Refresh Rate" blank.
• I check the box for "Fullscreen".
• The "Screen Resolution" changes to1920x1080 and the "Refresh Rate" changes to 55 Hz.
• When I try to select a different refresh rate, there are only 6 available options: 50 Hz, 51 Hz, 52 Hz, 53 Hz, 54 Hz, and 55 Hz.
• After I click the "Continue" button, the application runs fullscreen.

[Ali-RS]

Sounds like this is related to #947

Can you please check if this solution works for you: #947 (comment)

Edit:

The "Screen Resolution" changes to1920x1080

Also, can you try different resolutions and see if makes any difference?
In my case, the resolution changes to 1440, 900 when selecting "Fullscreen". And I get the same error when I click the "Continue" button but if I change it to something else (e.g 1024, 768) the error goes away.

[stephengold]

ertugrulcetin's solution doesn't work for me.

1280x960 screen resolution does work for me.

I think we can close this as a duplicate of #947.

[Ali-RS]

@stephengold, by the way, do you have a secondary monitor connected?

In my case, I am using an external monitor connected to my laptop. I noticed if I unplug that and use the laptop's built-in monitor then it works fine.

[stephengold]

only one monitor in my setup

[Ali-RS]

Can you please run this Linux command xrandr -q and post the result?

[stephengold]

sgold:~$ xrandr -q
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 16384 x 16384
DVI-I-0 disconnected (normal left inverted right x axis y axis)
VGA-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 853mm x 480mm
   1920x1080     60.00*+  59.94    29.97    23.98    60.05    60.00  
   1680x1050     59.95  
   1440x900      59.89  
   1440x480      60.05  
   1280x1024     60.02  
   1280x960      60.00  
   1280x800      74.93    59.81  
   1280x768      59.99  
   1280x720      60.00    59.94  
   1024x768      60.00  
   800x600       60.32    56.25  
   720x480       59.94  
   640x480       59.94    59.93  
sgold:~$ 

[Ali-RS]

@stephengold can you please test with this lwjgl jar and see if it fixes your issue?
lwjgl.zip

I have forked lwjgl2 and applied this patch provided by @riccardobl

Edit:
In my case the xrandr -q result is

Screen 0: minimum 320 x 200, current 1440 x 900, maximum 8192 x 8192
LVDS-1 connected (normal left inverted right x axis y axis)
   1366x768      60.00 +
   1360x768      59.80    59.96  
   1280x720      60.00    59.99    59.86    59.74  
   1024x768      60.04    60.00  
   960x720       60.00  
   928x696       60.05  
   896x672       60.01  
   1024x576      59.95    59.96    59.90    59.82  
   960x600       59.93    60.00  
   960x540       59.96    59.99    59.63    59.82  
   800x600       60.00    60.32    56.25  
   840x525       60.01    59.88  
   864x486       59.92    59.57  
   800x512       60.17  
   700x525       59.98  
   800x450       59.95    59.82  
   640x512       60.02  
   720x450       59.89  
   700x450       59.96    59.88  
   640x480       60.00    59.94  
   720x405       59.51    58.99  
   684x384       59.88    59.85  
   680x384       59.80    59.96  
   640x400       59.88    59.98  
   576x432       60.06  
   640x360       59.86    59.83    59.84    59.32  
   512x384       60.00  
   512x288       60.00    59.92  
   480x270       59.63    59.82  
   400x300       60.32    56.34  
   432x243       59.92    59.57  
   320x240       60.05  
   360x202       59.51    59.13  
   320x180       59.84    59.32  
VGA-1 connected primary 1440x900+0+0 (normal left inverted right x axis y axis) 408mm x 255mm
   1440x900      59.89*+  74.98  
   1280x1024     75.02    60.02  
   1280x960      60.00  
   1152x864      75.00  
   1024x768      75.03    70.07    60.00  
   832x624       74.55  
   800x600       75.00    60.32    56.25  
   640x480       75.00    59.94  
   720x400       70.08  
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)

As you can see the second monitor is my primary monitor but lwjgl2 was wrongly picking the first one.

Edit2:

This is the commit: https://github.com/Ali-RS/lwjgl/commit/fbeac9a69a347bf7d34a01931b8757fac5f8dd41

[stephengold]

can you please test with this lwjgl jar and see if it fixes your issue?

1. I unzipped the ZIP you suggested and moved the JAR to "lib/lwjgl.jar" .
2. I edited jme3-lwjgl/build.gradle to change

api 'org.lwjgl.lwjgl:lwjgl:2.9.3'

to

api 'lwjgl:lwjgl'

3. When I tried to run HelloJme3, I got:

Jan 05, 2023 9:28:30 AM com.jme3.system.JmeDesktopSystem initialize
INFO: Running on jMonkeyEngine 3.6.0-alpha1
 * Branch: master
 * Git Hash: 5b9fc87
 * Build Date: 2023-01-05
Exception in thread "jME3 Main" java.lang.UnsatisfiedLinkError: The required native library 'openal64' was not found in the classpath via 'native/linux/libopenal64.so'. Error message: no openal64 in java.library.path: /usr/java/packages/lib:/usr/lib64:/lib64:/lib:/usr/lib
	at com.jme3.system.NativeLibraryLoader.loadNativeLibrary(NativeLibraryLoader.java:590)
	at com.jme3.system.lwjgl.LwjglContext.loadNatives(LwjglContext.java:229)
	at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:219)
	at java.base/java.lang.Thread.run(Thread.java:833)

4. I added

runtimeOnly 'org.lwjgl.lwjgl:lwjgl-platform:2.9.3:natives-linux'

(Are those the correct natives to use with your fork?)

5. When I ran HelloJME3 I still got invalid refresh rates and

Jan 05, 2023 10:05:06 AM com.jme3.system.JmeDesktopSystem initialize
INFO: Running on jMonkeyEngine 3.6.0-alpha1
 * Branch: master
 * Git Hash: 5b9fc87
 * Build Date: 2023-01-05
Jan 05, 2023 10:05:06 AM com.jme3.app.LegacyApplication handleError
SEVERE: Failed to create display
java.lang.RuntimeException: Unable to find fullscreen display mode matching settings
	at com.jme3.system.lwjgl.LwjglDisplay.createContext(LwjglDisplay.java:80)
	at com.jme3.system.lwjgl.LwjglAbstractDisplay.initInThread(LwjglAbstractDisplay.java:120)
	at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:221)
	at java.base/java.lang.Thread.run(Thread.java:833)

Jan 05, 2023 10:05:06 AM com.jme3.app.LegacyApplication handleError
SEVERE: Uncaught exception thrown in Thread[jME3 Main,5,main]
java.lang.IllegalMonitorStateException: current thread is not owner
	at java.base/java.lang.Object.notifyAll(Native Method)
	at com.jme3.system.lwjgl.LwjglAbstractDisplay.initInThread(LwjglAbstractDisplay.java:135)
	at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:221)
	at java.base/java.lang.Thread.run(Thread.java:833)


Exception: java.lang.NullPointerException thrown from the UncaughtExceptionHandler in thread "jME3 Main"

[Ali-RS]

Thanks so much for trying it.

Are those the correct natives to use with your fork?

Yes

When I ran HelloJME3 I still got invalid refresh rates and

I doubt in your case it might be the AWT that returns the wrong display modes that do not match with the display modes loaded by lwjgl2 (via xrandr).

[stephengold]

Both LWJGLv2 and LWJGLv3 provide methods to enumerate the available display modes. For my Acorus library, I wrote utility methods to dynamically determine which version(s) of LWJGL are available and invoke the appropriate method. It seems to work reliably.

I think we should do something similar for the v3.6 display-settings dialog.

[pspeed42]

Yes, I agree... it seems to be something we've been missing for a long time to be able to generically get a list of "GL library supported modes" without guessing by asking AWT.

[Ali-RS]

Good idea!

Edit:

Found the utility class you mentioned. Going to take a closer look at it.

https://github.com/stephengold/Acorus/blob/0a8331b07cbecb68fa7ffb12b7a10b6b3794c0ef/AcorusLibrary/src/main/java/jme3utilities/ui/DsUtils.java#L56