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Date: Thu, 6 Aug 2009 11:53:14 -0700 (PDT)
From: "Rick Hillegas (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Updated: (DERBY-700) Derby does not prevent dual boot of
 database from different classloaders on Linux and Mac OS X
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     [ https://issues.apache.org/jira/browse/DERBY-700?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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

    Attachment: DualBootRepro.java

It appears to me that a workaround for this bug is to upgrade to Java 6. I am attaching a slightly revised version of the repro, DualBootRepro.java (this revision contains all of the helper classes needed to create the failure scenario). I see failures on the following platforms:

Apple Java 5 on Mac OS X
Sun Java 5 on Ubuntu Linux
IBM Java 5 on Ubuntu Linux

Happily, however, the second boot fails and raises java.nio.channels.OverlappingFileLockException on the following platforms:

Apple Java 6 beta on Mac OS X
Sun Java 6 on Ubuntu Linux
IBM Java 5 on Ubuntu Linux

Admittedly, that's a graceless failure. However, I think it should prevent the database from being corrupted and it's worth recommending an upgrade to Java 6 for users who encounter this bug.

> 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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