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From "Daniel John Debrunner (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3466) Investigate ability to run multiple Derby systems in same JVM with different sets of MBeans.
Date Thu, 06 Mar 2008 14:34:58 GMT

    [ 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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