[LOG4J2-771] Add lookup for application main arguments

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.1
• Component/s: Core

Environment

Apache Maven 3.2.2 (45f7c06d68e745d05611f7fd14efb6594181933e; 2014-06-17T09:51:42-04:00)
Maven home: C:\Java\apache-maven-3.2.2
Java version: 1.7.0_60, vendor: Oracle Corporation
Java home: C:\Program Files\Java\jdk1.7.0_60\jre
Default locale: en_US, platform encoding: Cp1252
OS name: "windows 7", version: "6.1", arch: "amd64", family: "windows"

• Assignee: Gary D. Gregory
• Reporter: Gary D. Gregory
• Created: 07/Aug/14 17:00
• Updated: 27/Sep/14 14:09
• Resolved: 20/Aug/14 13:35

Description

As a user I want to use the following expression in configuration files:

If my static void main String[] arguments are:
--file foo.txt --verbose -x bar

I should be able to say:

• ${main:0} -> --file
• ${main:1} -> foo.txt
• ${main:2} -> --verbose
• ${main:3} -> -x
• ${main:4} -> bar
• ${main:--file} -> foo.txt
• ${main:-x} -> bar
• ${main:bar} -> null

For this to work, I have to call:

import org.apache.logging.log4j.core.lookup.MapLookup;

public static void main(String args[]) {
  //...
  MapLookup.setMainArguments(args);
  //...
}