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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-700) Derby does not prevent dual boot of database from different classloaders on Linux and Mac OS X
Date Fri, 07 Aug 2009 19:59:15 GMT

     [ https://issues.apache.org/jira/browse/DERBY-700?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rick Hillegas updated DERBY-700:
--------------------------------

    Attachment: derby-700-01-aa-catchOverlappingFileLockException.diff

Attaching derby-700-01-aa-catchOverlappingFileLockException.diff. This patch catches the OverlappingFileLockException,
releases the channel, and sets the status to indicate that another Derby instance has locked
the database. I have not run any tests yet other than verifying that the repro runs correctly
on Java 6, but I'm posting this patch to see if the Store experts think this looks right.
Once we agree that the code looks good, we can write some additional regression tests for
this problem.

Touches the following file:

M      java/engine/org/apache/derby/impl/io/DirFile4.java


> 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-700-01-aa-catchOverlappingFileLockException.diff, 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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