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https://issues.apache.org/jira/browse/XALANJ-2436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12574533#action_12574533
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Holger Hoffstätte commented on XALANJ-2436:
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Btw it is easy to try this without ant. Just run:
java -jar jarjar-1.0rc6.jar process <rulesfile> xalan-2.7.1.jar
xalan-2.7.1-fixed.jar
Look inside the fixed jar and you will see that the bcel/regexp packages have
been moved, and all references to them have been rewritten.
> 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: 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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