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https://issues.apache.org/jira/browse/DERBY-6945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16297827#comment-16297827
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Bryan Pendleton commented on DERBY-6945:
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Hi Rick, thanks for the follow-up. From some casual web searching, it 
seems like this behavior of URLClassLoader is rather delicate and 
finicky; sometimes it works, sometimes it doesn't?

https://bugs.java.com/bugdatabase/view_bug.do?bug_id=JDK-8168647

https://bz.apache.org/bugzilla/show_bug.cgi?id=59226

https://stackoverflow.com/questions/25729319/how-does-a-classloader-load-classes-reference-in-the-manifest-classpath



> Re-package Derby as a collection of jigsaw modules
> --------------------------------------------------
>
>                 Key: DERBY-6945
>                 URL: https://issues.apache.org/jira/browse/DERBY-6945
>             Project: Derby
>          Issue Type: Improvement
>    Affects Versions: 10.13.1.2
>            Reporter: Rick Hillegas
>         Attachments: derby-6945-01-aa-remove_derbyPreBuild_dep.diff, 
> derby-6945-02-ab-newDerbySharedJar.diff, jdeps.out.tar
>
>
> Once we commit to building with Java 9 (see DERBY-6856), we should consider 
> re-packaging Derby as a set of jigsaw modules. This would result in a 
> different set of release artifacts. This might be a good opportunity to 
> address the Tomcat artifactory issues raised by issue DERBY-6944.



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