[External] : Re: OpenJDK 21 with FX (Azul, Bellsouth) on Windows: java.lang.UnsatisfiedLinkError: 'java.lang.String com.sun.javafx.font.direct, write.DWFactory.regReadFontLink(java.lang.String)'

Rony G. Flatscher Rony.Flatscher at wu.ac.at
Sat Sep 30 11:40:30 UTC 2023


Added the subdir "bin/javafx" then copied all files of "bin" into it after which everything works.

Both OpenJDK 21 versions (Azul, Bellsouth) were downloaded as zip-archives, unzipped and JAVA_HOME 
set accordingly, which has been working for all past versions. It seems that somewhere a wrong 
configuration sneaked into 21 causing the loading of the dlls from the wrong, non-existing 
subdirectory "bin/javafx".

---rony


On 29.09.2023 23:32, Rony G. Flatscher wrote:
>
> Also, in this case JAVA_HOME is set as:
>
>     F:\work\svn\bsf4oorexx\branches\850\bsf4oorexx\samples\JavaFX>set j
>     JAVA_HOME=C:\Program Files\BellSoft\jdk-21-full
>
> ---rony
>
>
> On 29.09.2023 23:29, Rony G. Flatscher wrote:
>>
>> Sorry, had to go to an event in between.
>>
>> On 29.09.2023 15:35, Kevin Rushforth wrote:
>>> It generally doesn't matter where the Microsoft DLLs are loaded from. What I don't see in your 
>>> log is the loading of javafx_font.dll. That, and the other JavaFX libraries, are the important ones.
>>
>> This is interesting as well, here the occurrences of javafx_font.dll:
>>
>>     F:\work\svn\bsf4oorexx\branches\850\bsf4oorexx\samples\JavaFX>dir C:\javafx_font.dll /s
>>      Volume in drive C is root_c
>>      Volume Serial Number is 2AF2-88BA
>>
>>      Directory of C:\Program Files\azul\zulu21_jdk21.0.0\bin
>>
>>     12.09.2023  14:02            77 864 javafx_font.dll
>>                    1 File(s)         77 864 bytes
>>
>>      Directory of C:\Program Files\BellSoft\jdk-18.0.1.1-full\bin
>>
>>     28.05.2022  04:41            76 992 javafx_font.dll
>>                    1 File(s)         76 992 bytes
>>
>>      Directory of C:\Program Files\BellSoft\jdk-21-full\bin
>>
>>     20.09.2023  01:11            77 504 javafx_font.dll
>>                    1 File(s)         77 504 bytes
>>
>>      Directory of C:\Program Files\BellSoft\LibericaJDK-17-Full\bin
>>
>>     12.01.2023  21:09            76 992 javafx_font.dll
>>                    1 File(s)         76 992 bytes
>>
>>      Directory of C:\Program Files (x86)\BellSoft\jdk8u312-full\jre\bin
>>
>>     16.10.2021  20:54            61 152 javafx_font.dll
>>                    1 File(s)         61 152 bytes
>>
>>      Directory of C:\Program Files (x86)\BellSoft\LibericaJDK-17-Full\bin
>>
>>     28.05.2022  02:52            62 144 javafx_font.dll
>>                    1 File(s)         62 144 bytes
>>
>>      Directory of C:\Program Files (x86)\BellSoft\LibericaJDK-8-Full\jre\bin
>>
>>     27.05.2022  22:59            61 632 javafx_font.dll
>>                    1 File(s)         61 632 bytes
>>
>>      Directory of C:\Users\Administrator\.IdeaIC2019.3\system\tmp\patch-update\jre\bin
>>
>>     16.04.2020  17:59            80 408 javafx_font.dll
>>                    1 File(s)         80 408 bytes
>>
>>      Directory of
>>     C:\Users\Administrator\AppData\Local\JetBrains\IdeaIC2020.1\tmp\patch-update\jre\bin
>>
>>     24.09.2020  16:30            80 408 javafx_font.dll
>>                    1 File(s)         80 408 bytes
>>
>>      Directory of C:\Users\Administrator\AppData\Local\SceneBuilder\runtime\bin
>>
>>     05.06.2018  13:48            58 792 javafx_font.dll
>>                    1 File(s)         58 792 bytes
>>
>>          Total Files Listed:
>>                   10 File(s)        713 888 bytes
>>                    0 Dir(s)  34 872 254 464 bytes free
>>
>> Here here the relevant trace:
>>
>>     ... cut ...
>>     WARNING: java.lang.UnsatisfiedLinkError: Can't load library: C:\Program
>>     Files\BellSoft\jdk-21-full\bin\javafx\msvcp140_2.dll
>>     Loaded C:\Program Files\BellSoft\LibericaJDK-17-Full\bin\msvcp140_2.dll from java.library.path
>>     WARNING: java.lang.UnsatisfiedLinkError: Can't load library: C:\Program
>>     Files\BellSoft\jdk-21-full\bin\javafx\prism_d3d.dll
>>     Loaded C:\Program Files\BellSoft\LibericaJDK-17-Full\bin\prism_d3d.dll from java.library.path
>>     JavaFX: using com.sun.javafx.tk.quantum.QuantumToolkit
>>     WARNING: java.lang.UnsatisfiedLinkError: Can't load library: C:\Program
>>     Files\BellSoft\jdk-21-full\bin\javafx\glass.dll
>>     Loaded C:\Program Files\BellSoft\LibericaJDK-17-Full\bin\glass.dll from java.library.path
>>     WARNING: java.lang.UnsatisfiedLinkError: Can't load library: C:\Program
>>     Files\BellSoft\jdk-21-full\bin\javafx\javafx_font.dll
>>     Loaded C:\Program Files\BellSoft\LibericaJDK-17-Full\bin\javafx_font.dll from java.library.path
>>     Exception in Application start method
>>     Exception in thread "JavaFX Application Thread" java.lang.UnsatisfiedLinkError:
>>     'java.lang.String com.sun.javafx.font.directwrite.DWFactory.regReadFontLink(java.
>>     lang.String)'
>>             at javafx.graphics/com.sun.javafx.font.directwrite.DWFactory.regReadFontLink(Native
>>     Method)
>>             at
>>     javafx.graphics/com.sun.javafx.font.directwrite.DWFactory.getFallbacks(DWFactory.java:166)
>>             at javafx.graphics/com.sun.javafx.font.LogicalFont.getLinkedFonts(LogicalFont.java:214)
>>             at javafx.graphics/com.sun.javafx.font.LogicalFont.getNumSlots(LogicalFont.java:223)
>>             at
>>     javafx.graphics/com.sun.javafx.font.CompositeGlyphMapper.<init>(CompositeGlyphMapper.java:62)
>>             at javafx.graphics/com.sun.javafx.font.LogicalFont.getGlyphMapper(LogicalFont.java:439)
>>             at javafx.graphics/com.sun.javafx.text.GlyphLayout.breakRuns(GlyphLayout.java:229)
>>             at
>>     javafx.graphics/com.sun.javafx.text.PrismTextLayout.buildRuns(PrismTextLayout.java:819)
>>             at javafx.graphics/com.sun.javafx.text.PrismTextLayout.layout(PrismTextLayout.java:1070)
>>             at
>>     javafx.graphics/com.sun.javafx.text.PrismTextLayout.ensureLayout(PrismTextLayout.java:230)
>>             at
>>     javafx.graphics/com.sun.javafx.text.PrismTextLayout.getBounds(PrismTextLayout.java:256)
>>             at
>>     javafx.controls/com.sun.javafx.scene.control.skin.Utils.computeTextWidth(Utils.java:129)
>>             at
>>     javafx.controls/javafx.scene.control.skin.LabeledSkinBase.computeMinLabeledPartWidth(LabeledSkinBase.java:809)
>>             at
>>     javafx.controls/javafx.scene.control.skin.LabeledSkinBase.computeMinWidth(LabeledSkinBase.java:306)
>>             at javafx.controls/javafx.scene.control.Control.computeMinWidth(Control.java:504)
>>             at javafx.graphics/javafx.scene.Parent.minWidth(Parent.java:1049)
>>             at javafx.graphics/javafx.scene.layout.Region.minWidth(Region.java:1500)
>>             at javafx.graphics/javafx.scene.layout.Region.computeChildPrefAreaWidth(Region.java:1959)
>>             at javafx.graphics/javafx.scene.layout.AnchorPane.computeChildWidth(AnchorPane.java:344)
>>             at javafx.graphics/javafx.scene.layout.AnchorPane.layoutChildren(AnchorPane.java:380)
>>             at javafx.graphics/javafx.scene.Parent.layout(Parent.java:1208)
>>             at javafx.graphics/javafx.scene.Scene.doLayoutPass(Scene.java:594)
>>             at javafx.graphics/javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2600)
>>             at javafx.graphics/com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:401)
>>             at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
>>             at javafx.graphics/com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:400)
>>             at javafx.graphics/com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:430)
>>             at
>>     javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:592)
>>             at
>>     javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:572)
>>             at
>>     javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:565)
>>             at
>>     javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:352)
>>             at
>>     javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
>>             at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
>>             at
>>     javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:185)
>>             at java.base/java.lang.Thread.run(Thread.java:1583)
>>
>> Here the PATH environment variable in this case (no jdk17):
>>
>>     PATH=C:\Program
>>     Files\BellSoft\jdk-21-full\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;e:\rony\tools;e:\vslick\win;C:\Program
>>     Files (x86)\Common Files\Roxio Shared\DLLShared\;C:\Program Files\Microsoft
>>     DNX\Dnvm\;C:\Program Files (x86)\Windows Kits\8.1\Windows Performance Toolkit\;C:\Program
>>     Files\gs\gs9.22\lib;C:\Program Files\gs\gs9.22\bin;C:\WINDOWS\System32\OpenSSH\;C:\Program
>>     Files (x86)\PuTTY\;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common
>>     Files\Intel\WirelessCommon\;C:\Program Files\TortoiseSVN\bin;C:\Program
>>     Files\TortoiseHg\;C:\Program Files\TortoiseGit\bin;C:\Program Files\dotnet\;C:\Program Files
>>     (x86)\AOMEI\AOMEI Backupper\7.1.2;C:\Program Files\Git\cmd;C:\Program
>>     Files\BSF4ooRexx850;c:\Program Files (x86)\Intel\Intel(R) Management Engine
>>     Components\DAL;c:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program
>>     Files\oorexx;C:\Users\Administrator\AppData\Local\Programs\Python\Python311\Scripts\;C:\Users\Administrator\AppData\Local\Programs\Python\Python311\;C:\Users\Administrator\AppData\Local\Microsoft\WindowsApps;C:\Program
>>     Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\
>>
>> So JDK17 is not on PATH, but Java/JDK 21 finds JDK17, maybe from the registry entry for 
>> "Computer\HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\JDK\17.0.3" (only entry), having an entry of 
>> "JavaHome" with the value of "C:\Program Files\BellSoft\LibericaJDK-17-Full".
>>
>> Also key "Computer\HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\JDK\17.0.3\MSI" having an entry for 
>> "INSTALLDIR" of "C:\Program Files\BellSoft\LibericaJDK-17-Full\".
>>
>> So it seems that JDK21's java.exe will not find the dlls in the non-existing 
>> "*\jdk-21-full\javafx\" directory and eventually resorting to the registry entry to lookup JDK 17.
>>
>> ---rony
>>
>>
>>> On 9/29/2023 6:30 AM, Rony G. Flatscher wrote:
>>>> On 29.09.2023 14:53, Kevin Rushforth wrote:
>>>>> This is a new native method (actually moved from another class) in JavaFX 21. This is very 
>>>>> likely due to a mismatch between the native library and the Java classes. I suspect you have a 
>>>>> directory in your PATH that is picking up an old javafx_font.dll library. Run your program 
>>>>> with "-Djavafx.verbose=true" to see where the library is loaded from.
>>>>
>>>> Thank you, this is the output:
>>>>
>>>>     WARNING: java.lang.UnsatisfiedLinkError: Can't load library: C:\Program
>>>>     Files\BellSoft\jdk-21-full\bin\javafx\api-ms-win-core-console-l1-1-0.dll
>>>>     Loaded C:\Program Files\TortoiseGit\bin\api-ms-win-core-console-l1-1-0.dll from
>>>>     java.library.path
>>>>     WARNING: java.lang.UnsatisfiedLinkError: Can't load library: C:\Program
>>>>     Files\BellSoft\jdk-21-full\bin\javafx\api-ms-win-core-console-l1-2-0.dll
>>>>     System.loadLibrary(api-ms-win-core-console-l1-2-0) succeeded
>>>>     WARNING: java.lang.UnsatisfiedLinkError: Can't load library: C:\Program
>>>>     Files\BellSoft\jdk-21-full\bin\javafx\api-ms-win-core-datetime-l1-1-0.dll
>>>>     Loaded C:\Program Files\TortoiseGit\bin\api-ms-win-core-datetime-l1-1-0.dll from
>>>>     java.library.path
>>>>     WARNING: java.lang.UnsatisfiedLinkError: Can't load library: C:\Program
>>>>     Files\BellSoft\jdk-21-full\bin\javafx\api-ms-win-core-debug-l1-1-0.dll
>>>>     Loaded C:\Program Files\TortoiseGit\bin\api-ms-win-core-debug-l1-1-0.dll from java.library.path
>>>>     WARNING: java.lang.UnsatisfiedLinkError: Can't load library: C:\Program
>>>>     Files\BellSoft\jdk-21-full\bin\javafx\api-ms-win-core-errorhandling-l1-1-0.dll
>>>>     Loaded C:\Program Files\TortoiseGit\bin\api-ms-win-core-errorhandling-l1-1-0.dll from
>>>>     java.library.path
>>>>     WARNING: java.lang.UnsatisfiedLinkError: Can't load library: C:\Program
>>>>     Files\BellSoft\jdk-21-full\bin\javafx\api-ms-win-core-file-l1-1-0.dll
>>>>     Loaded C:\Program Files\TortoiseGit\bin\api-ms-win-core-file-l1-1-0.dll from java.library.path
>>>>
>>>>     ... cut ...
>>>>
>>>> So indeed, it seems to be picking up those dlls from TortoiseGit.
>>>>
>>>> The dlls are there:
>>>>
>>>>     C:\Program Files\BellSoft\jdk-21-full\bin
>>>>
>>>>      Directory of C:\Program Files\BellSoft\jdk-21-full\bin
>>>>
>>>>     19.09.2023  17:09            22 008 api-ms-win-core-console-l1-1-0.dll
>>>>     19.09.2023  17:09            21 992 api-ms-win-core-console-l1-2-0.dll
>>>>     19.09.2023  17:09            22 024 api-ms-win-core-datetime-l1-1-0.dll
>>>>     19.09.2023  17:09            22 008 api-ms-win-core-debug-l1-1-0.dll
>>>>     19.09.2023  17:09            22 008 api-ms-win-core-errorhandling-l1-1-0.dll
>>>>     19.09.2023  17:09            22 008 api-ms-win-core-fibers-l1-1-0.dll
>>>>     19.09.2023  17:09            26 120 api-ms-win-core-file-l1-1-0.dll
>>>>     19.09.2023  17:09            22 024 api-ms-win-core-file-l1-2-0.dll
>>>>     19.09.2023  17:09            22 024 api-ms-win-core-file-l2-1-0.dll
>>>>     19.09.2023  17:09            22 024 api-ms-win-core-handle-l1-1-0.dll
>>>>     19.09.2023  17:09            21 984 api-ms-win-core-heap-l1-1-0.dll
>>>>     19.09.2023  17:09            22 008 api-ms-win-core-interlocked-l1-1-0.dll
>>>>     19.09.2023  17:09            22 024 api-ms-win-core-libraryloader-l1-1-0.dll
>>>>     19.09.2023  17:09            22 008 api-ms-win-core-localization-l1-2-0.dll
>>>>     19.09.2023  17:09            21 984 api-ms-win-core-memory-l1-1-0.dll
>>>>     19.09.2023  17:09            21 984 api-ms-win-core-namedpipe-l1-1-0.dll
>>>>     19.09.2023  17:09            22 008 api-ms-win-core-processenvironment-l1-1-0.dll
>>>>     19.09.2023  17:09            22 024 api-ms-win-core-processthreads-l1-1-0.dll
>>>>     19.09.2023  17:09            21 984 api-ms-win-core-processthreads-l1-1-1.dll
>>>>     19.09.2023  17:09            21 984 api-ms-win-core-profile-l1-1-0.dll
>>>>     19.09.2023  17:09            21 984 api-ms-win-core-rtlsupport-l1-1-0.dll
>>>>     19.09.2023  17:09            22 024 api-ms-win-core-string-l1-1-0.dll
>>>>     19.09.2023  17:09            22 024 api-ms-win-core-synch-l1-1-0.dll
>>>>     19.09.2023  17:09            21 968 api-ms-win-core-synch-l1-2-0.dll
>>>>     19.09.2023  17:09            22 024 api-ms-win-core-sysinfo-l1-1-0.dll
>>>>     19.09.2023  17:09            22 024 api-ms-win-core-timezone-l1-1-0.dll
>>>>     19.09.2023  17:09            21 984 api-ms-win-core-util-l1-1-0.dll
>>>>     19.09.2023  17:09            22 024 api-ms-win-crt-conio-l1-1-0.dll
>>>>     19.09.2023  17:09            26 104 api-ms-win-crt-convert-l1-1-0.dll
>>>>     19.09.2023  17:09            21 984 api-ms-win-crt-environment-l1-1-0.dll
>>>>     19.09.2023  17:09            22 024 api-ms-win-crt-filesystem-l1-1-0.dll
>>>>     19.09.2023  17:09            21 984 api-ms-win-crt-heap-l1-1-0.dll
>>>>     19.09.2023  17:09            22 008 api-ms-win-crt-locale-l1-1-0.dll
>>>>     19.09.2023  17:09            30 176 api-ms-win-crt-math-l1-1-0.dll
>>>>     19.09.2023  17:09            30 216 api-ms-win-crt-multibyte-l1-1-0.dll
>>>>     19.09.2023  17:09            75 232 api-ms-win-crt-private-l1-1-0.dll
>>>>     19.09.2023  17:09            22 008 api-ms-win-crt-process-l1-1-0.dll
>>>>     19.09.2023  17:09            26 080 api-ms-win-crt-runtime-l1-1-0.dll
>>>>     19.09.2023  17:09            26 120 api-ms-win-crt-stdio-l1-1-0.dll
>>>>     19.09.2023  17:09            26 120 api-ms-win-crt-string-l1-1-0.dll
>>>>     19.09.2023  17:09            21 984 api-ms-win-crt-time-l1-1-0.dll
>>>>     19.09.2023  17:09            22 024 api-ms-win-crt-utility-l1-1-0.dll
>>>>
>>>> but the look-up is using "C:\Program Files\BellSoft\jdk-21-full\bin\javafx\..."
>>>>
>>>> The Windows PATH starts out with:
>>>>
>>>>     PATH=C:\Program Files\BellSoft\jdk-21-full\bin;... cut ...
>>>>
>>>> ---rony
>>>>
>>>>
>>>>>
>>>>> On 9/29/2023 5:06 AM, Rony G. Flatscher wrote:
>>>>>>
>>>>>> Downloaded the 64-bit OpenJDK21 package for Windows that include JavaFX from Azul ("FX") and 
>>>>>> Bellsouth ("full").
>>>>>>
>>>>>> Both packages cause the following error:
>>>>>>
>>>>>>     Exception in Application start method
>>>>>>     Exception in thread "JavaFX Application Thread" java.lang.UnsatisfiedLinkError:
>>>>>>     'java.lang.String com.sun.javafx.font.direct
>>>>>>     write.DWFactory.regReadFontLink(java.lang.String)'
>>>>>>             at
>>>>>>     javafx.graphics/com.sun.javafx.font.directwrite.DWFactory.regReadFontLink(Native Method)
>>>>>>             at
>>>>>>     javafx.graphics/com.sun.javafx.font.directwrite.DWFactory.getFallbacks(DWFactory.java:166)
>>>>>>             at
>>>>>>     javafx.graphics/com.sun.javafx.font.LogicalFont.getLinkedFonts(LogicalFont.java:214)
>>>>>>             at javafx.graphics/com.sun.javafx.font.LogicalFont.getNumSlots(LogicalFont.java:223)
>>>>>>             at
>>>>>>     javafx.graphics/com.sun.javafx.font.CompositeGlyphMapper.<init>(CompositeGlyphMapper.java:62)
>>>>>>             at
>>>>>>     javafx.graphics/com.sun.javafx.font.LogicalFont.getGlyphMapper(LogicalFont.java:439)
>>>>>>             at javafx.graphics/com.sun.javafx.text.GlyphLayout.breakRuns(GlyphLayout.java:229)
>>>>>>             at
>>>>>>     javafx.graphics/com.sun.javafx.text.PrismTextLayout.buildRuns(PrismTextLayout.java:819)
>>>>>>             at
>>>>>>     javafx.graphics/com.sun.javafx.text.PrismTextLayout.layout(PrismTextLayout.java:1070)
>>>>>>             at
>>>>>>     javafx.graphics/com.sun.javafx.text.PrismTextLayout.ensureLayout(PrismTextLayout.java:230)
>>>>>>             at
>>>>>>     javafx.graphics/com.sun.javafx.text.PrismTextLayout.getBounds(PrismTextLayout.java:256)
>>>>>>             at
>>>>>>     javafx.controls/com.sun.javafx.scene.control.skin.Utils.computeTextWidth(Utils.java:129)
>>>>>>             at
>>>>>>     javafx.controls/javafx.scene.control.skin.LabeledSkinBase.computeMinLabeledPartWidth(LabeledSkinBase.java:809)
>>>>>>             at
>>>>>>     javafx.controls/javafx.scene.control.skin.LabeledSkinBase.computeMinWidth(LabeledSkinBase.java:306)
>>>>>>             at javafx.controls/javafx.scene.control.Control.computeMinWidth(Control.java:504)
>>>>>>             at javafx.graphics/javafx.scene.Parent.minWidth(Parent.java:1049)
>>>>>>             at javafx.graphics/javafx.scene.layout.Region.minWidth(Region.java:1500)
>>>>>>             at
>>>>>>     javafx.graphics/javafx.scene.layout.Region.computeChildPrefAreaWidth(Region.java:1959)
>>>>>>             at
>>>>>>     javafx.graphics/javafx.scene.layout.AnchorPane.computeChildWidth(AnchorPane.java:344)
>>>>>>             at javafx.graphics/javafx.scene.layout.AnchorPane.layoutChildren(AnchorPane.java:380)
>>>>>>             at javafx.graphics/javafx.scene.Parent.layout(Parent.java:1208)
>>>>>>             at javafx.graphics/javafx.scene.Scene.doLayoutPass(Scene.java:594)
>>>>>>             at javafx.graphics/javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2600)
>>>>>>             at javafx.graphics/com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:401)
>>>>>>             at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
>>>>>>             at javafx.graphics/com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:400)
>>>>>>             at javafx.graphics/com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:430)
>>>>>>             at
>>>>>>     javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:592)
>>>>>>             at
>>>>>>     javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:572)
>>>>>>             at
>>>>>>     javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:565)
>>>>>>             at
>>>>>>     javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:352)
>>>>>>             at
>>>>>>     javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
>>>>>>             at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
>>>>>>             at
>>>>>>     javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:185)
>>>>>>             at java.base/java.lang.Thread.run(Thread.java:1583)
>>>>>>
>>>>>> Would anyone know how to fix this, if possible at all?
>>>>>>
>>>>>> ---rony
>>>>>>
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