Jan Høydahl created SOLR-17697:
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             Summary: Use picocli instead of commons-cli
                 Key: SOLR-17697
                 URL: https://issues.apache.org/jira/browse/SOLR-17697
             Project: Solr
          Issue Type: Improvement
          Components: cli
            Reporter: Jan Høydahl


Apache commons-cli has served us well for years, but our CLI has out-grown its 
capabilities, with multiple sub commands and a plethora of options and 
arguments. We have much custom code to work around limitations.

By embracing [Picocli|https://picocli.info/], an annotation based cli 
framework, it will be easier to maintain the cli and add further tools. We 
propose to target 10.0 and do work gradually in a feature branch.



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