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https://issues.apache.org/jira/browse/LUCENE-8156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16353541#comment-16353541
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Adrien Grand commented on LUCENE-8156:
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[~thetaphi] Requiring users to not have ASM on the Ant classpath sounds totally
reasonable to me if this issue can't be fixed easily. Thanks for adding this
test, this error message is definitely better, I had to do quite some digging
to understand what the problem was about. +1 to commit
> 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
> 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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