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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-700) Derby does not prevent dual boot of database from different classloaders on Linux and Mac OS X
Date Fri, 07 Aug 2009 13:10:14 GMT

    [ https://issues.apache.org/jira/browse/DERBY-700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12740540#action_12740540
] 

Kathey Marsden commented on DERBY-700:
--------------------------------------

Thank you Rick for looking at this issue.  I think it sorely needs a new pair of eyes. I know
I have seen dual boot on SuSE Linux with IBM 1.6, but have not tried the recent fix packs.
 I have seen the OverlappingFileLockException  on IBM 1.6 with z/OS, but thought it was a
JVM bug working in our favor.  Has there been recent spec clarification that exclusive java.nio.FileLocks
should prevent cross classloader access?  If we determine that the OverlappingFileLockException
is the correct JVM behavior, then I think we can catch that exception and throw a dual boot
message and then file JVM bugs where we don't see the OverlappingFileLockException.



> Derby does not prevent dual boot of database from different classloaders on Linux and
Mac OS X
> ----------------------------------------------------------------------------------------------
>
>                 Key: DERBY-700
>                 URL: https://issues.apache.org/jira/browse/DERBY-700
>             Project: Derby
>          Issue Type: Bug
>          Components: Store
>    Affects Versions: 10.0.2.0, 10.0.2.1, 10.1.1.0, 10.1.2.1, 10.1.3.1, 10.2.1.6, 10.2.2.0,
10.3.1.4, 10.4.1.3
>         Environment: ava -version
> java version "1.4.2_08"
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_08-b03)
> Java HotSpot(TM) Client VM (build 1.4.2_08-b03, mixed mode)
> also
> java version "1.5.0_19"
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_19-b02-304)
> Java HotSpot(TM) Client VM (build 1.5.0_19-137, mixed mode, sharing)
> on Mac OS X 10.5.7.
>            Reporter: Kathey Marsden
>            Priority: Critical
>         Attachments: DERBY-700.diff, DERBY-700.stat, derby-700_06_07_07_diff.txt, derby-700_06_07_07_stat.txt,
derby-700_06_19_2007, derby-700_diff.txt, derby-700_stat.txt, DERBY-700_v1_use_to_run_DualBootrepro_multithreaded.diff,
DERBY-700_v1_use_to_run_DualBootrepro_multithreaded.stat, derby-700_with_NPE_fix_diff.txt,
derby-700_with_NPE_fix_stat.txt, derby.log, derby700_singleproperty_v1.diff, derby700_singleproperty_v1.stat,
DualBootRepro.java, DualBootRepro.java, DualBootRepro2.zip, DualBootRepro_mutltithreaded.tar.bz2,
releaseNote.html, releaseNote.html
>
>
> Derby does not prevent dual boot from two different classloaders on Linux and Mac OS
X.
> To reproduce run the  program DualBootRepro with no derby jars in your classpath. The
program assumes derby.jar is in 10.1.2.1/derby.jar, you can change the location by changing
the DERBY_LIB_DIR variable.
> On Linux the output is:
> $java -cp . DualBootRepro
> Loading derby from file:10.1.2.1/derby.jar
> 10.1.2.1/derby.jar
> Booted database in loader java.net.URLClassLoader@8ed465
> FAIL: Booted database in 2nd loader java.net.URLClassLoader@dc6a77
> On Windows I get the expected output.
> $ java -cp . DualBootRepro
> Loading derby from file:10.1.2.1/derby.jar
> 10.1.2.1/derby.jar
> Booted database in loader java.net.URLClassLoader@1ac04e8
> PASS: Expected exception for dualboot:Another instance of Derby may have already booted
the database D:\marsden\repro\dualboot\mydb.

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