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https://issues.apache.org/jira/browse/DERBY-646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12514237
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Ashwin Jayaprakash commented on DERBY-646:
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The Derby JAR file is sealed - and this means that all the Derby packages
specified in the JAR file's Manifest are sealed and you cannot add a new Class
that shares the Package names to the Classpath.
Since there are classes in org.apache.derby.impl.io Package in the Derby
"sealed" JAR, you cannot append a Class like
org.apache.derby.impl.io.PureMemStore that resides outside the JAR to the
ClassPath. Unless I'm completely wrong, you will have to use the Source code
and add your files there and then recreate the JAR file.
> In-memory backend storage support
> ---------------------------------
>
> Key: DERBY-646
> URL: https://issues.apache.org/jira/browse/DERBY-646
> Project: Derby
> Issue Type: New Feature
> Components: Store
> Environment: All
> Reporter: Stephen Fitch
> Attachments: derby-646-1a-raw-compiles.diff,
> derby-646-1a-raw-compiles.stat, svn.diff
>
>
> To allow creation and modification of databases in-memory without requiring
> disk access or space to store the database.
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