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