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Date: Thu, 6 Mar 2008 06:34:58 -0800 (PST)
From: "Daniel John Debrunner (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Commented: (DERBY-3466) Investigate ability to run multiple
 Derby systems in same JVM with different sets of MBeans.
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    [ https://issues.apache.org/jira/browse/DERBY-3466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12575717#action_12575717 ] 

Daniel John Debrunner commented on DERBY-3466:
----------------------------------------------

> So the system identifiers that are now part of all of Derby MBeans' ObjectNames are there in case DERBY-1228 ("Make it possible to run multiple instances of Derby within the same VM") is resolved? Or is it possible to run multiple Derby systems in the same JVM today? 


It's possible to run multiple Derby systems today in the same virtual machine using different classloaders. The upgrade test does it.

The key point about DERBY-1228 is running in the same virtual machine with a different configuration, namely derby.system.home, not really the multiple classloader bit.

> Investigate ability to run multiple Derby systems in same JVM with different sets of MBeans.
> --------------------------------------------------------------------------------------------
>
>                 Key: DERBY-3466
>                 URL: https://issues.apache.org/jira/browse/DERBY-3466
>             Project: Derby
>          Issue Type: Sub-task
>          Components: JMX
>            Reporter: Daniel John Debrunner
>            Priority: Minor
>         Attachments: d3466_mbean_system_id.txt
>
>
> One of the reasons for JMX was to move away from system properties (specifically derby.system.home) to allow multiple Derby systems running within the same virtual machine. It would be good to get some unique naming/attribute scheme in the ObjectNames up front rather than only have it in some later version.

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