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https://issues.apache.org/jira/browse/CLI-203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12879574#action_12879574
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Emmanuel Bourg commented on CLI-203:
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In the case exposed we could either throw an exception or ignore the default
option. Ignoring the default option if its group is already set seems more
sensible.
> The state of the option groups is not updated by the default options
> --------------------------------------------------------------------
>
> Key: CLI-203
> URL: https://issues.apache.org/jira/browse/CLI-203
> Project: Commons CLI
> Issue Type: Bug
> Components: Parser
> Affects Versions: 1.1
> Reporter: Emmanuel Bourg
> Priority: Minor
> Fix For: 1.3
>
>
> The state of the option groups is neither checked nor updated when the
> default options passed as a Properties instance to the parse method are
> processed. For example if 'a' and 'b' are two mutually exclusive options, the
> command line argument could specify 'a' and the default options could contain
> 'b', the parser will not complain and the resulting CommandLine will contain
> 'a' and 'b'.
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