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https://issues.apache.org/jira/browse/LOG4J2-1589?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmitriy Neretin updated LOG4J2-1589:
------------------------------------
    Description: 
There is already a good description what "default value nesting" is: 
http://logback.qos.ch/manual/configuration.html#nestedSubst (use your browser 
search function)

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}

  was:
There is already a good description what "default value nesting" is: 
http://logback.qos.ch/manual/configuration.html (use your browser search 
function)

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}


> 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 (use your browser 
> search function)
> 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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