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.
