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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-4735) IBM J9 JVM causes test failure in Kuromoji's TestExtended
Date Tue, 29 Jan 2013 20:35:13 GMT
Michael McCandless created LUCENE-4735:
------------------------------------------

             Summary: IBM J9 JVM causes test failure in Kuromoji's TestExtended
                 Key: LUCENE-4735
                 URL: https://issues.apache.org/jira/browse/LUCENE-4735
             Project: Lucene - Core
          Issue Type: Bug
            Reporter: Michael McCandless


Note that this is not a Lucene bug; it's a JVM bug, but I wanted to track it in Lucene as
well in case others hit it.

I noticed this test frequently fails when running under IBM's J9 JVM (1.6.0) ... and I finally
tracked down the root cause and made a small test case, eg on trunk, rev 1439839, if you run:

{noformat}
  ant test -Dtestcase=TestExtendedMode -Dtestmethod=testRandomHugeStrings -Dtests.seed=26D2B352E9603950
{noformat}

it fails with this:

{noformat}
[junit4:junit4]    > Throwable #1: java.lang.IllegalArgumentException: startOffset must
be non-negative, and endOffset must be >= startOffset, startOffset=4272,endOffset=4271
[junit4:junit4]    > 	at __randomizedtesting.SeedInfo.seed([26D2B352E9603950:BEF1D491B7168518]:0)
[junit4:junit4]    > 	at org.apache.lucene.analysis.tokenattributes.OffsetAttributeImpl.setOffset(OffsetAttributeImpl.java:45)
[junit4:junit4]    > 	at org.apache.lucene.analysis.ja.JapaneseTokenizer.incrementToken(JapaneseTokenizer.java:463)
[junit4:junit4]    > 	at org.apache.lucene.analysis.BaseTokenStreamTestCase.checkAnalysisConsistency(BaseTokenStreamTestCase.java:635)
[junit4:junit4]    > 	at org.apache.lucene.analysis.BaseTokenStreamTestCase.checkRandomData(BaseTokenStreamTestCase.java:546)
[junit4:junit4]    > 	at org.apache.lucene.analysis.BaseTokenStreamTestCase.checkRandomData(BaseTokenStreamTestCase.java:447)
[junit4:junit4]    > 	at org.apache.lucene.analysis.BaseTokenStreamTestCase.checkRandomData(BaseTokenStreamTestCase.java:375)
[junit4:junit4]    > 	at org.apache.lucene.analysis.ja.TestExtendedMode.testRandomHugeStrings(TestExtendedMode.java:76)
{noformat}

I've seen other analyzer tests fail with similar exceptions.

I dug in, and found that there's a bug in TreeMap.subMap, and it's easily reproduced with
a small test case, which I'll attach.  I'll also open an issue with J9.

I also found a workaround that seems to sidestep the bug for Lucene.

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