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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
Date Tue, 19 Jun 2007 16:10:27 GMT

    [ https://issues.apache.org/jira/browse/DERBY-700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12506228
] 

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

Dan asked:
>Could the problem (needing to expand) with the synchronization be related to question
I raised earlier?

>> - the synchronization for getting the intra jvm lock and releasing it are using different
objects. Don't they need to use the same object?

No even with that corrected the test still fails with only putting synchronization on getIntraJVMDBLock()

In the comment above, I'm not sure which piece of code you are referring to here?

This is from privGetJBMSLockOnDB()

> Derby does not prevent dual boot of database from different classloaders on Linux
> ---------------------------------------------------------------------------------
>
>                 Key: DERBY-700
>                 URL: https://issues.apache.org/jira/browse/DERBY-700
>             Project: Derby
>          Issue Type: Bug
>          Components: Store
>    Affects Versions: 10.1.2.1
>         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)
>            Reporter: Kathey Marsden
>            Assignee: Kathey Marsden
>            Priority: Critical
>             Fix For: 10.3.0.0
>
>         Attachments: DERBY-700.diff, DERBY-700.stat, derby-700_06_07_07_diff.txt, derby-700_06_07_07_stat.txt,
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, DualBootRepro2.zip, DualBootRepro_mutltithreaded.tar.bz2, releaseNote.html,
releaseNote.html
>
>
> Derby does not prevent dual boot from two different classloaders on Linux.
> 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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