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https://issues.apache.org/jira/browse/CONFIGURATION-704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16499897#comment-16499897
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Dan Alon commented on CONFIGURATION-704:
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you are correct, this is what i want, but the problem is I want to load the 
override con figuration files with the "include" functionality and not hard 
coded in the code, I was able to do what I want when overriding your 
"addPropertyInternal" function. but it would be nice to have a property to 
disable and enable this feature.

> an option to override property key instead of creation of lists
> ---------------------------------------------------------------
>
>                 Key: CONFIGURATION-704
>                 URL: https://issues.apache.org/jira/browse/CONFIGURATION-704
>             Project: Commons Configuration
>          Issue Type: New Feature
>    Affects Versions: 2.2
>            Reporter: Dan Alon
>            Priority: Major
>
> Hi,
>  
> I want an option when loading a properties file from the include 
> functionality (or in the same file) to disable the list feature that when 
> entering the same key it creates a list instead of override the old value.
> for example when entering these properties:
> colors.pie = #FF0000
> colors.pie = #00FF00
> colors.pie = #0000FF
> instead of creating a string with seperator like this  colors.pie 
> =#FF0000,#00FF00,#0000FF
>  
> i want only the last value colors.pie = #0000FF



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