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https://issues.apache.org/jira/browse/JENA-1842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17040744#comment-17040744
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Jan Martin Keil commented on JENA-1842:
---------------------------------------

I took a brief look on 
[https://github.com/apache/jena/search?q=System.err.println|https://github.com/apache/jena/search?q=System.err.println],
 and some of the results looked like further cases. But I did not check that in 
detail.

> Replace System.*.print* with Log.*
> ----------------------------------
>
>                 Key: JENA-1842
>                 URL: https://issues.apache.org/jira/browse/JENA-1842
>             Project: Apache Jena
>          Issue Type: Improvement
>    Affects Versions: Jena 3.14.0
>            Reporter: Jan Martin Keil
>            Priority: Major
>
> Apache Jena uses {{Sytem.err.print*}} (e.g. {{ParserSPARQL11#perform}}) 
> outside of testcases, cmd tools, and examples. This makes it hard to control 
> the output of software using the Jena libraries. I recommend to consistently 
> replace them with appropriated {{Log.info}}, {{Log.warn}}, or {{Log.error}} 
> calls.



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