[jira] [Commented] (LOG4J2-1243) Faulty placeholder substitution in config xml

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

    [ https://issues.apache.org/jira/browse/LOG4J2-1243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15259590#comment-15259590 ] 

Ralph Goers commented on LOG4J2-1243:
-------------------------------------

If I am understanding this issue correctly the desire is to have a substitution where the default value can be a lookup expression with its own default value.

> Faulty placeholder substitution in config xml
> ---------------------------------------------
>
>                 Key: LOG4J2-1243
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1243
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: Lookups
>    Affects Versions: 2.5
>         Environment: JDK 8
>            Reporter: Veit Guna
>
> I'm using log4j 2.5 in a REST service.
> There I would like to use the placeholder substitution to allow configuration of the log location.
> I tried this:
> {code:xml}
> <Properties>
> <!-- sets the path for log4j logs:
> 1. check whether java system property myapp.logs is set. If not:
> 2. check whether the OS environment variable MYAPP_LOGS is set. If not:
> 3. use logs dir in the current directory
> -->
> <Property name="logsPath">${sys:mypapp.logs:-${env:MYAPP_LOGS:-logs}}</Property>
> </Properties>
> {code}
> This seems to work quite well with the exception, if myapp.logs is set, the path ends with "}". So if I set the system property "-Dmyapp.logs=foobar" it creates the directory "foobar}" and puts the logs into that. For the ENV substitution it works. It also works when NO placeholder nesting is performed. So I guess the problem has something todo with that.
> See: http://mail-archives.apache.org/mod_mbox/logging-log4j-user/201601.mbox/%3CD91F2A5E-92AD-4A94-BA89-CCB7B5F83974%40gmail.com%3E
> Thanks
> Veit



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