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https://issues.apache.org/jira/browse/LOG4J2-1013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16395529#comment-16395529
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Fernando Díaz edited comment on LOG4J2-1013 at 3/12/18 5:16 PM:
----------------------------------------------------------------

Hi. I would like to work on this.

Just one thing. I've been looking at the code and I still don't understand why 
there is a DEFAULT_VALUE_DELIMITER. I can not find in the documentation 
anything about a default value for properties. For example, 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:v:-bar}] %-5level: 
%msg%n%throwable
{code}
The output is:
{code}
2018-03-12 18:04:00,962 [main] [foo.txt][1][-file][bar] ERROR: this is an error 
message
{code}
[bar] is ok because I didn't provide a value in the command line. However I can 
not find a similar example in the documentation.

 


was (Author: fdiazgon):
Hi. I would like to work on this.

Just one thing. I've been looking at the code and I still don't understand why 
there is a DEFAULT_VALUE_DELIMITER. I can not find in the documentation 
anything about a default value for properties. For example, if I run 
{{org.apache.logging.log4j.core.lookup.MainInputArgumentsLookupTest}} with the 
command line {{--file foo.txt}} and the following pattern layout:
{quote}%d [%t] [${main:1}][${main:-1}][${main:--file}][${main:v:-bar}] 
%-5level: %msg%n%throwable
{quote}
The output is:
{quote}2018-03-12 18:04:00,962 [main] [foo.txt][1][-file][bar] ERROR: this is 
an error message
{quote}
[bar] is ok because I didn't provide a value in the command line. However I can 
not find a similar example in the documentation.

 

> 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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