JavaFX on headless Jenkins

[Tom Eugelink]

I'm trying to run JavaFX UI tests using TestFX on a headless Jenkins server (Ubuntu / Debian). I've gotten to the point where the UI is actually started by Jenkins, but then the test fail with a "no suitable pipeline found". Any suggestions how to fix that?

:*test*
Executing task ':test' (up-to-date check took 0.054 secs) due to:
   No history is available.
Starting process 'Gradle Worker 1'. Working directory: /var/lib/jenkins/workspace/JFXtras8.0 Command: /usr/lib/jvm/jdk1.8.0-ea/bin/java -Djava.security.manager=jarjar.org.gradle.process.internal.child.BootstrapSecurityManager -Dfile.encoding=UTF-8 -ea -cp /var/lib/jenkins/.gradle/caches/1.9/workerMain/gradle-worker.jar jarjar.org.gradle.process.internal.launcher.GradleWorkerMain
Successfully started process 'Gradle Worker 1'
Gradle Worker 1 executing tests.

jfxtras.labs.scene.control.test.ListSpinnerEditableTest > enterSelectValueByTyping STANDARD_ERROR
     Graphics Device initialization failed for :  es2, sw
     Error initializing QuantumRenderer: no suitable pipeline found
     java.lang.RuntimeException: java.lang.RuntimeException: Error initializing QuantumRenderer: no suitable pipeline found
     	at com.sun.javafx.tk.quantum.QuantumRenderer.getInstance(QuantumRenderer.java:300)
     	at com.sun.javafx.tk.quantum.QuantumToolkit.init(QuantumToolkit.java:244)
     	at com.sun.javafx.tk.Toolkit.getToolkit(Toolkit.java:179)
     	at com.sun.javafx.application.PlatformImpl.startup(PlatformImpl.java:210)
     	at com.sun.javafx.application.LauncherImpl.startToolkit(LauncherImpl.java:653)
     	at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:678)
     	at com.sun.javafx.application.LauncherImpl.access$000(LauncherImpl.java:56)
     	at com.sun.javafx.application.LauncherImpl$1.run(LauncherImpl.java:158)
     	at java.lang.Thread.run(Thread.java:744)
     Caused by: java.lang.RuntimeException: Error initializing QuantumRenderer: no suitable pipeline found
     	at com.sun.javafx.tk.quantum.QuantumRenderer$PipelineRunnable.init(QuantumRenderer.java:98)
     	at com.sun.javafx.tk.quantum.QuantumRenderer$PipelineRunnable.run(QuantumRenderer.java:128)
     	... 1 more
     Exception in thread "Thread-4" java.lang.RuntimeException: No toolkit found
     	at com.sun.javafx.tk.Toolkit.getToolkit(Toolkit.java:191)
     	at com.sun.javafx.application.PlatformImpl.startup(PlatformImpl.java:210)
     	at com.sun.javafx.application.LauncherImpl.startToolkit(LauncherImpl.java:653)
     	at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:678)
     	at com.sun.javafx.application.LauncherImpl.access$000(LauncherImpl.java:56)
     	at com.sun.javafx.application.LauncherImpl$1.run(LauncherImpl.java:158)
     	at java.lang.Thread.run(Thread.java:744)