Not able to load LOG4J2.xml File from system environment variable - log4j2

Question

I am doing a web application using Tomcat in eclipse and I kept the log4j2.xml file in environment variable location.
using System environment variable
Variable name : sys_logroot
Variable value : D:\user\gouse
In this directory I have my log4j2.xml file.I am trying to use this log4j2.xml file in my application I am not able to load this xml file and no log files are created to my application.
How can I load an Log4j2.xml file into my application to get logs for my application?

Answer 1

Apache says (from here):
How do I specify the configuration file location?
By default, Log4j looks for a configuration file named log4j2.xml (not
log4j.xml) in the classpath.
You can also specify the full path of the configuration file with this
system property:
-Dlog4j.configurationFile=path/to/log4j2.xml
i.e. you have to set the system property at runtime to let log4j use it. Something like this:
String value = System.getenv("sys_logroot");
value = "file:" + value;
System.setProperty("log4j.configurationFile", value);
Important is to call this part before using classes logging. Here is my test code:
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
public class Main {
private static final Logger logger = LogManager.getLogger(Main.class.getName());
public void doSomething() {
logger.debug("Do something");
}
}
Tester:
public class Tester {
public static void main(String[] args) {
String value = System.getenv("sys_logroot");
value = "file:" + value;
System.setProperty("log4j.configurationFile", value);
new Main().doSomething();
}
}