[jira] [Commented] (LOG4J2-1013) Log4j2 Main Arguments Lookup by name doesn't work

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

    [ https://issues.apache.org/jira/browse/LOG4J2-1013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14679626#comment-14679626 ] 

Ralph Goers commented on LOG4J2-1013:
-------------------------------------

As far as StrSubstitutor is concerned all variables are of the form ${key:-defaultValue}.  StrSubstituor uses Lookups to resolve the key into a value. The Interpolator is a "special" Lookup that subdivides the key into "LookupName:key". The default value portion should be left alone and should only be used when the key cannot be resolved. The problem I believe you are having is that StrSubstitutor is seeing the ":-" and is removing that along with the "-file" to use as the default value. Changing the value to ":" is just going to make things worse.

I don't know that we document that you can have default values for lookups, but the syntax would be ${lookup:key:-defaultValue}.  As you noted we could change the default value delimiter to something else that we know wouldn't cause a problem - if you know what that is. Perhaps ";-" would work better since that would distinguish it from the Lookup key.

> Log4j2 Main Arguments Lookup by name doesn't work
> -------------------------------------------------
>
>                 Key: LOG4J2-1013
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1013
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: API, Core, Lookups
>    Affects Versions: 2.2
>         Environment: Windows 7 x64 Ultimate and Java 8U31 x64. Project created using Eclipse.
>            Reporter: Ioan Mihaila
>            Priority: Critical
>
> Accessing Main Arguments by using index based look up works : ${main:0}
> Accessing Main Arguments by using name based look up doesn't work : ${main:--file}
> When trying to access by name it doesn't retrieve the argument but retrieves "-file".



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