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https://issues.apache.org/jira/browse/LOG4J2-962?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14727619#comment-14727619
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Gary Gregory commented on LOG4J2-962:
-------------------------------------
For the case of a {{header}} in a {{PatternLayout}}:
{code:xml}
<PatternLayout pattern="%m%n" header="File: ${main:0}" />
{code}
The current code works. Please try Git master or a 2.4-SNAPSHOT build from
https://repository.apache.org/content/repositories/snapshots/org/apache/logging/log4j/
The test is
{{org.apache.logging.log4j.core.layout.PatternLayoutMainMapLookupTest}}.
> Main Arguments Lookup not working
> ---------------------------------
>
> Key: LOG4J2-962
> URL: https://issues.apache.org/jira/browse/LOG4J2-962
> Project: Log4j 2
> Issue Type: Bug
> Components: Lookups
> Affects Versions: 2.1
> Environment: Windows 7 x64, Java Batch Application
> Reporter: Johannes Siebel
>
> It is not possible to use the Main Arguments Lookup in the current version.
> The "main" prefix is not present in the corresponding Interpolator object and
> thus the resolution of the variable is not working as advertised in the
> documentation, e.g. using the following variable in the log4j2.xml:
> {code}${main:0}{code}
> As far as I can tell, the problem seems to stem from the
> PluginManger.collectPlugins-Method that does not acknowledge the existence of
> the Main Arguments Lookup.
> I'm following the documentation on the website with the following sample
> log4j2.xml:
> {code:xml}
> <File name="GLOBAL" fileName="${env:DATA_DIR}/log/${env:APP_NAME}.log" >
> <PatternLayout pattern="%m%n" header="File: ${main:0}" />
> ...
> {code}
> ...and following code in my application:
> {code}
> public static void main(String[] args) {
> MapLookup.setMainArguments(args);
> ...
> {code}
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