[jira] [Comment Edited] (LOG4J2-1589) Value nesting during property substitution

["Ralph Goers (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LOG4J2-1589?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15720670#comment-15720670 ] 

Ralph Goers edited comment on LOG4J2-1589 at 12/4/16 9:56 PM:
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I don't believe that property works the same way. As I recall, if the result of the substitution contains a $\{..} then that will recursively be interpolated. It seems that here he wants the default value to also be a property. I don't believe that is currently supported.


was (Author: ralphgoers):
I don't believe that property works the same way. As I recall, if the result of the substitution contains a ${..} then that will recursively be interpolated. It seems that here he wants the default value to also be a property. I don't believe that is currently supported.

> Value nesting during property substitution
> ------------------------------------------
>
>                 Key: LOG4J2-1589
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1589
>             Project: Log4j 2
>          Issue Type: Wish
>          Components: Configurators
>    Affects Versions: 2.5
>            Reporter: Dmitriy Neretin
>            Priority: Minor
>              Labels: features
>
> There is already a good description what "default value nesting" is: http://logback.qos.ch/manual/configuration.html#nestedSubst
> It is partially implemented in the log4j but it can still be improved.
> Example from that page above: 
> - "${id:-${userid}}" If the *id* variable is not set, *userid* will be used.
> At the moment it works only if the default value is a concrete value:
> - ${path:-/only/concrete/path/can/be/used/here}



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