We have been getting the following unit test failure in almost every test run on our Linux Hudson machines. I do not see this on my desktop Linux system.

javafx.scene.control.TreeTableViewMouseInputTest > test_rt30394 FAILED
    java.lang.AssertionError: expected:<1> but was:<0>
        at org.junit.Assert.fail(Assert.java:91)
        at org.junit.Assert.failNotEquals(Assert.java:645)
        at org.junit.Assert.assertEquals(Assert.java:126)
        at org.junit.Assert.assertEquals(Assert.java:470)
        at org.junit.Assert.assertEquals(Assert.java:454)
        at javafx.scene.control.TreeTableViewMouseInputTest.test_rt30394(TreeTableViewMouseInputTest.java:258)