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https://issues.apache.org/jira/browse/TEXT-127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16670029#comment-16670029
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ASF GitHub Bot commented on TEXT-127:
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Github user drajakumar closed the pull request at:
https://github.com/apache/commons-text/pull/91
> Add a toggle to throw an exception when a variable is unknown in
> StringSubstitutor
> ----------------------------------------------------------------------------------
>
> Key: TEXT-127
> URL: https://issues.apache.org/jira/browse/TEXT-127
> Project: Commons Text
> Issue Type: Improvement
> Reporter: Jean-Baptiste REICH
> Priority: Minor
> Fix For: 1.7
>
>
> Currently, StringSubstitutor is not replacing a variable that is unknown. It
> would be nice to define the behavior in this case and to allow raising an
> exception.
> A workaround is to define a custom StringLookup that raises an exception when
> the variable is unknown but this prevent from using the default value feature
> from StringSubstitutor
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