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https://issues.apache.org/jira/browse/DERBY-700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12483798
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Suresh Thalamati commented on DERBY-700:
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There  does not seem to be any  way to get process id info that can be used to 
fix this problem. Existing JVM enhancement requests  filed  to get process id 
info:
 
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4250622
http://bugs.sun.com/bugdatabase/view_bug.do;jsessionid=7c75c6fc92c662c739fb11f620a4:YfiG?bug_id=4244896

It was interesting to  reade these reports, other developers are finding it 
hard to generate unique id across jvms!
 


> 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
>            Priority: Critical
>         Attachments: DERBY-700.diff, DERBY-700.stat, 
> DERBY-700_v1_use_to_run_DualBootrepro_multithreaded.diff, 
> DERBY-700_v1_use_to_run_DualBootrepro_multithreaded.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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