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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-1228) Make it possible to run multiple instances of Derby within the same VM
Date Tue, 27 Mar 2007 17:44:32 GMT

    [ https://issues.apache.org/jira/browse/DERBY-1228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12484516
] 

Kathey Marsden commented on DERBY-1228:
---------------------------------------

I think you are correct; an alternative to derby.system.home is the main 
issue. We need  to provide an alternate way to specify the location for 
reading the properties file.  Additionally, DERBY-700 would need to be 
fixed and we would need testing to make sure things like aggregates work 
with two instances of  Derby loaded in the same  jvm.





> Make it possible to run multiple instances of Derby within the same VM
> ----------------------------------------------------------------------
>
>                 Key: DERBY-1228
>                 URL: https://issues.apache.org/jira/browse/DERBY-1228
>             Project: Derby
>          Issue Type: New Feature
>          Components: Services
>            Reporter: David Van Couvering
>
> Make it possible to run multiple instances of Derby within the same VM, each with its
own derby.system.home, separate configuration parameters, and even different versions of Derby
jar files. I haven't looked at this carefully, but at first glance I think this would require
(a) refactoring Derby code to get all configuration from a configuration API rather than directly
from system properties (b) write a configuration API/class that supports a properties file
as well as system properties (in the future this class could also work with JMX) (c) the ability
to specify the derby.system.home and a classpath as a DataSource property (d) a Derby classloader
that loads Derby jar files from the classpath specified on the DataSource

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