occasional test failure in JournalTest.cleanupTest

cleanupTest(org.apache.jackrabbit.oak.plugins.document.JournalTest) Time elapsed: 0.375 sec <<< FAILURE!
java.lang.AssertionError: expected:<0> but was:<1>
at org.junit.Assert.fail(Assert.java:93)
at org.junit.Assert.failNotEquals(Assert.java:647)
at org.junit.Assert.assertEquals(Assert.java:128)
at org.junit.Assert.assertEquals(Assert.java:472)
at org.junit.Assert.assertEquals(Assert.java:456)
at org.apache.jackrabbit.oak.plugins.document.JournalTest.cleanupTest(JournalTest.java:183)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)