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https://issues.apache.org/jira/browse/XALANJ-2436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16423299#comment-16423299
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Trejkaz commented on XALANJ-2436:
---------------------------------
This seems like it would be a good idea. Right now we have our own dependency
on a later BCEL and Xalan's internal copy of an older one, and it worries me
that for one user out there, they might be getting the Xalan one ahead of ours
on their classpath.
> Xalan must not expose bundled classes (bcel, regexp)
> ----------------------------------------------------
>
> Key: XALANJ-2436
> URL: https://issues.apache.org/jira/browse/XALANJ-2436
> Project: XalanJ2
> Issue Type: Bug
> Components: Xalan
> Affects Versions: 2.7.1
> Environment: any
> Reporter: Holger Hoffstätte
> Priority: Critical
> Attachments: XALAN-2436.patch, rewrite-packages.rules
>
>
> I just spent the better part of half a day figuring out what caused the
> problem outlined in
> https://sourceforge.net/tracker/?func=detail&atid=614693&aid=1902137&group_id=96405.
> Xalan bundles regexp and bcel, however since one of the recommened ways of
> installing xalan is via the endorsed mechanism this will wreak serious havoc
> on any other apps that use bcel. That would be less of a problem is xalan's
> version were up to date, but as of 2.7.1 it still includes a version from the
> early stone age (see XALANJ-2423). The solution is easy: when building the
> aggregate jar, add an ant task to rewrite the bundled packages via jarjar
> (http://code.google.com/p/jarjar/). This can be trivially added to the build
> and creates a completely self-contained xalan jar that will not blow up the
> world when endorsed.
> I will attach a trivial rule file for jarjar that rewrites the embedded
> packages which should immediately fix any collision problems. For more
> information about how to use jarjar, see
> http://code.google.com/p/jarjar/wiki/GettingStarted
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