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https://issues.apache.org/jira/browse/LUCENE-8156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16355857#comment-16355857
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Uwe Schindler commented on LUCENE-8156:
---------------------------------------
I committed to master. I keep this open until LUCENE-7966 is backported, as it
is requiredto backport it, too.
> patch-mrjar-classes fails if an old version of ASM is on the Ant classpath
> --------------------------------------------------------------------------
>
> Key: LUCENE-8156
> URL: https://issues.apache.org/jira/browse/LUCENE-8156
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Adrien Grand
> Assignee: Uwe Schindler
> Priority: Major
> Fix For: master (8.0)
>
> Attachments: LUCENE-8156.patch, image-2018-02-06-00-00-35-434.png
>
>
> If some optional tasks that depend on an old version of ASM are installed,
> patching fails with the following error:
> {{/home/jpountz/src/lucene-solr/lucene/common-build.xml:565:
> java.lang.IncompatibleClassChangeError: class
> org.objectweb.asm.commons.ClassRemapper has interface
> org.objectweb.asm.ClassVisitor as super class}}
> The reason is that ClassRemapper is loaded from the right place, but
> ClassVisitor, its parent class, is loaded from the parent classpath which may
> be a different version.
> It is easy to reproduce:
> - download and extract ant-1.10.1 (latest version)
> - run {{bin/ant -f fetch.xml -Ddest=system}}, this will add
> {{lib/asm-2.2.3.jar}} among other files
> - run {{ant clean test}} at the root of lucene-solr.
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