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https://issues.apache.org/jira/browse/LOG4J2-1013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16396377#comment-16396377
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Fernando Díaz commented on LOG4J2-1013:
---------------------------------------
See
[https://github.com/apache/logging-log4j2/pull/159|https://github.com/apache/logging-log4j2/pull/159]
Using that branch, if I run
{{org.apache.logging.log4j.core.lookup.MainInputArgumentsLookupTest}} with the
command line {{--file foo.txt}} and the following pattern layout:
{code}
%d [%t] [${main:1}][${main:-1}][${main:--file}][${main:bad:-${main:--file}}]
%-5level: %msg%n%throwable
{code}
The output is:
{code}
2018-03-13 02:23:40,824 [main] [foo.txt][1][foo.txt][foo.txt] ERROR: this is an
error message
{code}
Taking a look at other tests, in particular in {{StrSubstitutorTest}}, I think
the output {{[1]}} is correct because {{main}} is the key in that particular
case.
I've included some unit tests. All test pass.
> 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
> Attachments:
> LOG4J2_1013_select_underlying_StrLookup_before_stripping_off_potential_default_values.patch
>
>
> 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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