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https://issues.apache.org/jira/browse/WW-4698?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15568188#comment-15568188
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Lukasz Lenart commented on WW-4698:
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Docs updated as well
https://cwiki.apache.org/confluence/display/WW/Constant+Configuration#ConstantConfiguration-Valuesubstitution
> Allow <constant/> value substitution in XML configuration
> ---------------------------------------------------------
>
> Key: WW-4698
> URL: https://issues.apache.org/jira/browse/WW-4698
> Project: Struts 2
> Issue Type: Improvement
> Components: XML Configuration
> Affects Versions: 2.5.5
> Reporter: Lukasz Lenart
> Assignee: Lukasz Lenart
> Priority: Minor
> Fix For: 2.5.6
>
>
> It'd super useful if it'll be possible to substitute ENV variables in
> struts.xml
> {code:xml}
> <constant name="struts.devMode" value="${ENV.STRUTS_DEV_MODE:false}"/>
> {code}
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