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https://issues.apache.org/jira/browse/DERBY-700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12504352
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Kathey Marsden commented on DERBY-700:
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Thanks Dan for the comment.
getExclusiveLock() and getLockedFile() are only substatively relevant to
DirFile4 and for that file yes, I think there is a lock file per open file. I
will change the definition to say that getLockedFile() will return a
RandomAcess file to the lock file obtained by getExcluciveLock() if an
exclusive lock was successfully obtained with getExclusiveLock() otherwise it
will return null.
Does that sound right?
I'll look at the test. Maybe I will fix it post checkin if I am not able to
get it fixed up today.
> 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
>
>
> 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 [EMAIL PROTECTED]
> FAIL: Booted database in 2nd loader [EMAIL PROTECTED]
> 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 [EMAIL PROTECTED]
> PASS: Expected exception for dualboot:Another instance of Derby may have
> already booted the database D:\marsden\repro\dualboot\mydb.
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