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https://issues.apache.org/jira/browse/LOG4J2-1013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14549769#comment-14549769
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Gary Gregory commented on LOG4J2-1013:
--------------------------------------
I'm not sure how to solve this yet but there is something funky going on.
If you run
{{org.apache.logging.log4j.core.lookup.MainInputArgumentsLookupTest}} from
Eclipse (for example) with the command line {{--file foo.txt}} you will see:
{noformat}
2015-05-18 21:27:03,180 [main] [foo.txt][1][-file] ERROR: this is an error
message
{noformat}
The {{PatternLayout}} config is:
{noformat}
%d [%t] [${main:1}][${main:-1}][${main:--file}] %-5level: %msg%n%throwable
{noformat}
The
{{org.apache.logging.log4j.core.lookup.StrSubstitutor.DEFAULT_VALUE_DELIMITER}}
is:
{code:java}
public static final StrMatcher DEFAULT_VALUE_DELIMITER =
StrMatcher.stringMatcher(":-");
{code}
If I change it to:
{code:java}
public static final StrMatcher DEFAULT_VALUE_DELIMITER =
StrMatcher.stringMatcher(":");
{code}
The output is no good at all:
{noformat}
2015-05-18 21:29:48,255 [main] [1][-1][--file] ERROR: this is an error message
{noformat}
If I change it to:
{code:java}
public static final StrMatcher DEFAULT_VALUE_DELIMITER =
StrMatcher.stringMatcher("***");
{code}
The output is good:
{noformat}
2015-05-18 21:30:31,470 [main] [foo.txt][${main:-1}][foo.txt] ERROR: this is an
error message
{noformat}
What seems to happen is that the proper resolving mechanics need {{"main:1"}}
and {{"main:--file"}} to be passed down from
{{org.apache.logging.log4j.core.lookup.StrSubstitutor.substitute(LogEvent,
StringBuilder, int, int, List<String>)}} so that the lookup can then break up
the {{"main"}} from the {{"1"}} and the {{"--file"}}.
The problem is when the {{StrSubstitutor}} itself breaks up {{"main:--file"}}
since it is configured with a {{DEFAULT_VALUE_DELIMITER =
StrMatcher.stringMatcher(":-")}}.
There seems to be a conflict between the {{StrSubstitutor}} we copied from
Commons Lang and our {{StrLookup}}s.
Help, thoughts and fixes welcome.
Thank you,
Gary
> 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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