Very odd. If you can create a simple, standalone test case, ideally a
single, self-contained JavaFX application and a C main program as a
launcher, then you might want to file a bug at https://bugreport.java.com/
-- Kevin
On 1/19/2022 10:42 AM, Steve Hannah wrote:
Thanks for the reply.
> What are the JVM args you use for launching?
vm_args.version = JNI_VERSION_1_6;
vm_args.options = options;
vm_args.nOptions = numOptions;
vm_args.ignoreUnrecognized = 1;
For options, I'm just using -Djava.class.path, though I have
experimented using -Djavafx.verbose=true, which doesn't tell me much
more. It just logs warnings when it can't find the javafx nativelibs,
in the JDK libs directory - and reports that they are loaded from
resource.
> Are the JavaFX modules jlink'ed into the JDK or loaded via
--module-path?
They are included in the classpath. I'm not using modules.
Best regards
Steve
On Wed, Jan 19, 2022 at 10:35 AM Kevin Rushforth
<kevin.rushfo...@oracle.com> wrote:
Hard to say what's going on without more information. What are the
JVM
args you use for launching? Are the JavaFX modules jlink'ed into
the JDK
or loaded via --module-path? As a debugging aid, you might try
setting
the system property "javafx.verbose" to "true" before loading your
MyApplication class.
-- Kevin
On 1/19/2022 9:40 AM, Steve Hannah wrote:
> The following issue only seems to occur on Linux (Ubuntu
20.04.1), and only
> when I try to launch the JVM from a custom C launcher using
JNI. It does
> not occur when launching the JVM as a separate process using the
"java"
> binary. It also does not occur on MacOS when using the same C
launcher
> using JNI.
>
> When I call MyApplication.launch(args). (where MyApplication
extends the
> JavaFX Application class), I get the following stack trace:
>
> Jan. 19, 2022 8:54:27 A.M.
com.sun.javafx.application.PlatformImpl startup
> Exception in thread "Thread-5" java.lang.IllegalStateException: This
> operation is permitted on the event thread only; currentThread =
> Thread-5
> at
com.sun.glass.ui.Application.checkEventThread(Application.java:447)
> at
com.sun.glass.ui.Application.setName(Application.java:200)
> at
com.sun.javafx.application.PlatformImpl.lambda$setApplicationName$2(PlatformImpl.java:142)
> at
com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:457)
> at
java.base/java.security.AccessController.doPrivileged(Native Method)
> at
com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:456)
> at
com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
> Exception in Application start method
> Exception in thread "Thread-31" Failed to show docs
> java.lang.IllegalStateException: Not on FX application thread;
> currentThread = Thread-31
> at
com.sun.javafx.tk.Toolkit.checkFxUserThread(Toolkit.java:295)
> at
com.sun.javafx.tk.quantum.QuantumToolkit.checkFxUserThread(QuantumToolkit.java:458)
> at
com.sun.javafx.tk.quantum.QuantumToolkit.exit(QuantumToolkit.java:828)
> at
com.sun.javafx.application.PlatformImpl.lambda$tkExit$16(PlatformImpl.java:624)
> at
com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:484)
> at
com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:457)
> at
java.base/java.security.AccessController.doPrivileged(Native Method)
> at
com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:456)
> at
com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
> java.lang.RuntimeException: Exception in Application start method
> at
com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:901)
> at
com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:196)
> at java.base/java.lang.Thread.run(Thread.java:829)
> Caused by: java.lang.IllegalStateException: Not on FX application
> thread; currentThread = Thread-6
> at
com.sun.javafx.tk.Toolkit.checkFxUserThread(Toolkit.java:295)
> at
com.sun.javafx.tk.quantum.QuantumToolkit.checkFxUserThread(QuantumToolkit.java:458)
> at javafx.stage.Stage.<init>(Stage.java:254)
> at javafx.stage.Stage.<init>(Stage.java:240)
> at
com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:845)
> at
com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:484)
> at
com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:457)
> at
java.base/java.security.AccessController.doPrivileged(Native Method)
> at
com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:456)
> at
com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
>
>
> I have tried a few different versions of JavaFX (11, 11.0.2,
17.0.1),
> running on a few different JDK installs (all JDK11). Above
stacktrace is
> from 17.0.1.
>
> From the C application that launches the JVM, I have tried
running directly
> on the main thread, and also launching it in a fresh thread
using pthreads
> - but same issue. I am running this inside an application
written in Go
> but the JNI code is all in C.
>
> It appears as though JavaFX is unable to create its application
thread for
> some reason. Does anyone have any suggestions on reasons why
this would be
> the case? Are there some system properties that need to be
there which
> would have been bootstrapped by the "java" binary, but would not
when the
> JVM is launched via JNI?
>
> Any suggestions appreciated. I've been banging my head on this
for a while
> now.
>
> Best regards
>
> Steve
--
Steve Hannah
Web Lite Solutions Corp.
