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https://issues.apache.org/jira/browse/CASSANDRA-14915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16705169#comment-16705169
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Jon Meredith commented on CASSANDRA-14915:
------------------------------------------

I think that class is always packaged up in the {{ant-junit}} dependency, I 
grabbed the rpm and expanded it and checked the class is there.  I couldn't 
find an {{ant-optional}} package that included it under the standard repos.

{code}
[jmeredith@localhost x]$ jar tvf ./usr/share/java/ant/ant-junit.jar | grep 
JUnitTask
1746 Wed Mar 01 08:56:26 MST 2017 
org/apache/tools/ant/taskdefs/optional/junit/JUnitTask$1.class
{code}

If you always need to install {{ant-junit}} on Fedora, does this patch still 
have value other than permitting the build task to succeed (and none of the 
test tasks)?

> 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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