JDK-8087496 : [IntelliJ] JavaFX application not initialized on FX app thread
  • Type: Bug
  • Component: javafx
  • Sub-Component: application-lifecycle
  • Affected Version: 8
  • Priority: P4
  • Status: Open
  • Resolution: Unresolved
  • Submitted: 2014-04-08
  • Updated: 2018-09-05
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Other
tbdUnresolved
Related Reports
Relates :  
JDK-8102211 - Change FX startup such that the Application is initialized and constructed in the FX application thread
Description
The attached JavaFX program runs correctly on Java 8 when launched from the command line, or run via the NetBeans or Eclipse IDEs. However, when run from the IntelliJ IDE, the following exception occurs:

Exception in thread "main" java.lang.ExceptionInInitializerError
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:259)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:113)
Caused by: java.lang.IllegalStateException: Not on FX application thread; currentThread = main
    at com.sun.javafx.tk.Toolkit.checkFxUserThread(Toolkit.java:210)
    at com.sun.javafx.tk.quantum.QuantumToolkit.checkFxUserThread(QuantumToolkit.java:396)
    at javafx.scene.Scene.<init>(Scene.java:318)
    at javafx.scene.Scene.<init>(Scene.java:207)
    at TestStaticScene.<clinit>(TestStaticScene.java:13)
    ... 3 more
Comments
Note that this is an IntelliJ problem, so I plan to close this issue after filing it with JetBrains.
08-04-2014
This is happening because IntelliJ inserts their own "launcher" class, com.intellij.rt.execution.application.AppMain, that they pass to the Java launcher, and which in turn calls into the JavaFX application class. This defeats the Java launcher's ability to recognize a JavaFX program and initialize the JavaFX runtime.
08-04-2014