The following test failed in the JDK21 CI:

java/awt/Toolkit/GetScreenInsetsCustomGC/GetScreenInsetsCustomGC.java

Here's a snippet from the log file:

#section:main
----------messages:(7/297)----------
command: main GetScreenInsetsCustomGC
reason: Assumed action based on file name: run main GetScreenInsetsCustomGC
started: Thu May 25 02:39:08 UTC 2023
Mode: othervm
Additional options from @modules: --add-modules java.desktop
finished: Thu May 25 02:39:08 UTC 2023
elapsed time (seconds): 0.224
----------configuration:(3/40)----------
Boot Layer
  add modules: java.desktop

----------System.out:(0/0)----------
----------System.err:(12/893)----------
java.lang.NullPointerException: Cannot invoke "sun.awt.X11GraphicsDevice.getInsets()" because "device" is null
at java.desktop/sun.awt.X11.XToolkit.getScreenInsets(XToolkit.java:891)
at GetScreenInsetsCustomGC.main(GetScreenInsetsCustomGC.java:81)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at com.sun.javatest.regtest.agent.MainWrapper$MainTask.run(MainWrapper.java:138)
at java.base/java.lang.Thread.run(Thread.java:1583)

JavaTest Message: Test threw exception: java.lang.NullPointerException: Cannot invoke "sun.awt.X11GraphicsDevice.getInsets()" because "device" is null
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.NullPointerException: Cannot invoke "sun.awt.X11GraphicsDevice.getInsets()" because "device" is null
----------rerun:(44/5845)*----------