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https://issues.apache.org/jira/browse/CASSANDRA-16827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17398060#comment-17398060
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Andres de la Peña commented on CASSANDRA-16827:
-----------------------------------------------

Could this be related to [this recent 
failure|https://app.circleci.com/pipelines/github/adelapena/cassandra/769/workflows/48bdd598-7631-43ba-baf7-3738db10e482/jobs/7661]
 in the CircleCI test multiplexer, where {{testsome}} fails because the class 
{{JStackJUnitTask}} can't be found?

I think that the problem might be in the flag {{-Dno-build-test=true}} that the 
multiplexer uses to not run {{build-test}} in every iteration, relying on that 
this has already done by the build task. This is a performance optimisation 
that can be especially effective in fast tests.

It would be ideal to have the previous behaviour, but we can always run {{ant 
build-test}} at the beginning of every multiplexer runner while still not 
running it on every iteration, as it's done 
[here|https://github.com/adelapena/cassandra/commit/1f736c7e1a71dbfd2028a0543da27519274c447d].
 This seems enough to keep the multiplexer working, as [this 
run|https://app.circleci.com/pipelines/github/adelapena/cassandra/770/workflows/0fac2594-a1c6-4e2c-9070-f5f4dad0432a/jobs/7665]
 shows, although it requires some extra builds and therefore higher costs.

> "java: package org.apache.tools.ant does not exist" error 
> ----------------------------------------------------------
>
>                 Key: CASSANDRA-16827
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16827
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Build, Dependencies
>            Reporter: Ekaterina Dimitrova
>            Assignee: Ekaterina Dimitrova
>            Priority: Normal
>             Fix For: 3.11.x
>
>
> After CASSANDRA-16557 I am getting "java: package org.apache.tools.ant does 
> not exist" error when I try to run unit tests in IntelliJ.
>  



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