On some systems without a printer, the FX printing unit tests can fail with an NPE. Given where the exception is, it is unlikely to be a problem in the tset.

Here are the errors:

est.javafx.print.JobSettingsTest > dummyTest FAILED
    java.lang.NullPointerException
        at javafx.graphics/com.sun.prism.j2d.print.J2DPrinter.getMediaSizeName(J2DPrinter.java:832)
        at javafx.graphics/com.sun.prism.j2d.print.J2DPrinter.printableArea(J2DPrinter.java:848)
        at javafx.graphics/javafx.print.Printer.createPageLayout(Printer.java:250)
        at javafx.graphics/javafx.print.Printer.getDefaultPageLayout(Printer.java:222)
        at javafx.graphics/javafx.print.JobSettings.pageLayoutProperty(JobSettings.java:1113)
        at javafx.graphics/javafx.print.JobSettings.getPageLayout(JobSettings.java:1149)
        at javafx.graphics/javafx.print.JobSettings.toString(JobSettings.java:1175)
        at java.base/java.lang.String.valueOf(String.java:2788)
        at javafx.graphics/javafx.print.PrinterJob.toString(PrinterJob.java:562)
        at java.base/java.lang.String.valueOf(String.java:2788)
        at test.javafx.print.JobSettingsTest.setUp(JobSettingsTest.java:57)

test.javafx.print.JobSettingsTest > testCopiesSettings FAILED
    java.lang.NullPointerException

test.javafx.print.JobSettingsTest > testPrintSides FAILED
    java.lang.NullPointerException

test.javafx.print.JobSettingsTest > testPaper FAILED
    java.lang.NullPointerException

test.javafx.print.JobSettingsTest > testPaperSource FAILED
    java.lang.NullPointerException

test.javafx.print.JobSettingsTest > testPageRangeSettings FAILED
    java.lang.NullPointerException

test.javafx.print.JobSettingsTest > testPrintColorSettings FAILED
    java.lang.NullPointerException

test.javafx.print.JobSettingsTest > testPrintResolutions FAILED
    java.lang.NullPointerException

test.javafx.print.JobSettingsTest > testPageOrientation FAILED
    java.lang.NullPointerException

test.javafx.print.JobSettingsTest > testCollationSettings FAILED
    java.lang.NullPointerExceptiontest.javafx.stage.ShowAndWaitTest > testTimelinePrint[0] FAILED
    java.lang.NullPointerException

test.javafx.stage.ShowAndWaitTest > testTimelinePrint[1] FAILED
    java.lang.NullPointerException

test.javafx.stage.ShowAndWaitTest > testTimelinePrint[2] FAILED
    java.lang.NullPointerException


test.javafx.print.PrinterJobTest > testPrinter FAILED
    java.lang.NullPointerException

test.javafx.print.PrinterJobTest > dummyTest FAILED
    java.lang.NullPointerException

test.javafx.print.PrinterJobTest > testPrinterProperty FAILED
    java.lang.NullPointerException

test.javafx.stage.ShowAndWaitTest > testTimelinePrint[0] FAILED
    java.lang.NullPointerException

test.javafx.stage.ShowAndWaitTest > testTimelinePrint[1] FAILED
    java.lang.NullPointerException

test.javafx.stage.ShowAndWaitTest > testTimelinePrint[2] FAILED
    java.lang.NullPointerException