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https://issues.apache.org/jira/browse/DERBY-5964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13485962#comment-13485962
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Knut Anders Hatlen commented on DERBY-5964:
-------------------------------------------

Saw a very similar stacktrace on another machine the same night (running on a 
Raspberry Pi with Java SE 7 Embedded):

junit.framework.AssertionFailedError
        at 
org.apache.derbyTesting.functionTests.tests.store.AutomaticIndexStatisticsTest.testStatisticsCorrectness(AutomaticIndexStatisticsTest.java:324)
        at 
org.apache.derbyTesting.junit.BaseTestCase.runBare(BaseTestCase.java:117)
        at 
org.apache.derbyTesting.junit.BaseJDBCTestCase.runBareOverridable(BaseJDBCTestCase.java:424)
        at 
org.apache.derbyTesting.junit.BaseJDBCTestCase.runBare(BaseJDBCTestCase.java:441)
        at junit.extensions.TestDecorator.basicRun(TestDecorator.java:24)
        at junit.extensions.TestSetup$1.protect(TestSetup.java:21)
        at junit.extensions.TestSetup.run(TestSetup.java:25)
        at 
org.apache.derbyTesting.junit.BaseTestSetup.run(BaseTestSetup.java:57)
        at junit.extensions.TestDecorator.basicRun(TestDecorator.java:24)
        at junit.extensions.TestSetup$1.protect(TestSetup.java:21)
        at junit.extensions.TestSetup.run(TestSetup.java:25)

Twice the same night *and* coinciding with the DST switch.
                
> Timestamp comparison failure in 
> AutomaticIndexStatisticsTest.testStatisticsCorrectness
> --------------------------------------------------------------------------------------
>
>                 Key: DERBY-5964
>                 URL: https://issues.apache.org/jira/browse/DERBY-5964
>             Project: Derby
>          Issue Type: Bug
>          Components: Test
>    Affects Versions: 10.10.0.0
>            Reporter: Knut Anders Hatlen
>            Priority: Minor
>
> http://dbtg.foundry.sun.com/derby/test/Daily/jvm1.5/testing/testlog/lin/1402814-suitesAll_diff.txt
> 1) 
> testStatisticsCorrectness(org.apache.derbyTesting.functionTests.tests.store.AutomaticIndexStatisticsTest)junit.framework.AssertionFailedError
>       at 
> org.apache.derbyTesting.functionTests.tests.store.AutomaticIndexStatisticsTest.testStatisticsCorrectness(AutomaticIndexStatisticsTest.java:324)
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>       at 
> org.apache.derbyTesting.junit.BaseTestCase.runBare(BaseTestCase.java:117)
>       at 
> org.apache.derbyTesting.junit.BaseJDBCTestCase.runBareOverridable(BaseJDBCTestCase.java:424)
>       at 
> org.apache.derbyTesting.junit.BaseJDBCTestCase.runBare(BaseJDBCTestCase.java:441)
>       at junit.extensions.TestDecorator.basicRun(TestDecorator.java:24)
>       at junit.extensions.TestSetup$1.protect(TestSetup.java:21)
>       at junit.extensions.TestSetup.run(TestSetup.java:25)
>       at 
> org.apache.derbyTesting.junit.BaseTestSetup.run(BaseTestSetup.java:57)
>       at junit.extensions.TestDecorator.basicRun(TestDecorator.java:24)
>       at junit.extensions.TestSetup$1.protect(TestSetup.java:21)
>       at junit.extensions.TestSetup.run(TestSetup.java:25)
> The failure is caused by this assert:
>             assertTrue(s.created.before(now));
> It might be a coincidence, but it happened the same night as Europe was 
> switching from DST.
> It may also be related to DERBY-5046, where a similar assert failed because 
> poor clock resolution made the two timestamps equal.

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