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https://issues.apache.org/jira/browse/DERBY-2944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12513275
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Daniel John Debrunner commented on DERBY-2944:
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I think this is a bug (lack of feature) in the tool. Different versions of
derby can be booted and shutdown within the same jvm (with different class
loaders).
Derby's upgrade tests do this.
The mechanism to shutdown the embedded driver is to request a connection with
the URL
"jdbc:derby:;shutdown=true"
or to set the 'shutdownDatabase'Java bean property on the embedded data sources
to 'shutdown'
> Derby doesn't allow more than one instance per VM
> -------------------------------------------------
>
> Key: DERBY-2944
> URL: https://issues.apache.org/jira/browse/DERBY-2944
> Project: Derby
> Issue Type: Bug
> Components: Miscellaneous
> Affects Versions: 10.2.2.0
> Reporter: Aaron Digulla
>
> If you have an IDE or a DB tool, you cannot dynamically load/unload the
> embedded derby driver.
> In Eclipse BIRT, this created the following situation: The examples use Derby
> 10.1. My application uses 10.2. I can't switch between the examples and the
> reports in my application without restarting Eclipse and patching the Derby
> plugin.
> It would be great if you could add a method which we could call to cleanup
> the embedded driver so we can throw the classloader away and load another
> instance of Derby.
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