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https://issues.apache.org/jira/browse/CASSANDRA-14915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16705253#comment-16705253
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Jon Meredith commented on CASSANDRA-14915:
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Gave Ubuntu 16.04 a go - if you don't have {{ant-optionals}} installed the
patch allows the {{ant build}} command to succeed, however the tests still
won't run without {{ant-optionals}} installed as that contains the junit
integration.
Anyway, patch works as advertised (lowering the test timeout still triggers
stack traces) - however I'm not sure why somebody would want to run without
ant-junit available.
+1
> 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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