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https://issues.apache.org/jira/browse/CASSANDRA-14915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16705226#comment-16705226
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Jon Meredith commented on CASSANDRA-14915:
------------------------------------------

I worked out you meant ant-optional on the Debian derived ones - agreed we'll 
just need document requiring ant-junit on Fedora et al, and will test the patch 
against a distro with ant-optional available too.

> Handle ant-optional dependency
> ------------------------------
>
>                 Key: CASSANDRA-14915
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14915
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Build
>            Reporter: Marcus Eriksson
>            Assignee: Marcus Eriksson
>            Priority: Major
>             Fix For: 3.0.x, 3.11.x, 4.x
>
>
> CASSANDRA-13117 added a JUnit task which dumps threads on unit test timeout, 
> and it depends on a class in {{org.apache.tools.ant.taskdefs.optional}} which 
> seems to not always be present depending on how {{ant}} was installed. It can 
> cause this error when building;
> {code:java}
> Throws: cassandra-trunk/build.xml:1134: taskdef A class needed by class 
> org.krummas.junit.JStackJUnitTask cannot be found:
> org/apache/tools/ant/taskdefs/optional/junit/JUnitTask  using the classloader
> AntClassLoader[/.../cassandra-trunk/lib/jstackjunit-0.0.1.jar]
> {code}



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