'How to specify Log4J 2.x config location?

Is there any way to specify Log4J 2.x log4j2.xml file location manually (like DOMConfigurator in Log4J 1.x), without messing with classpath and system properties?

javaloggingconfigurationlog4jlog4j2


Solution 1:[1]

In Windows, be aware that you need to use a URI with the log4j.configurationFile property

-Dlog4j.configurationFile=file://C:\path\to\log4j2.xml

Solution 2:[2]

If you are using log4j2 and properties are in defined in log4j2.properties file then use this.

-Dlog4j2.configurationFile=file:/home/atul/log4j2.properties

Solution 3:[3]

For log4j version 2.12.1, you can find how to reconfigure log4j2 here.

Below is an example

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.core.LoggerContext;

File file = new File("C:\\Path for Windows OS\\yourConfig.xml");
    
LoggerContext context = (LoggerContext) LogManager.getContext(false);
context.setConfigLocation(file.toURI());
    
Logger log  = LogManager.getLogger(YourClass.class);

It seems to me that way of configuring log4j2 is changing with new releases, so you should be aware of that.

Solution 4:[4]

Using the LoggerContext allows to setConfigLocation.

File f = new File(this.logConfigFile);
URI fc = f.toURI();         
System.out.println("Loading logging config file: " + fc);
Logger l = (Logger) LogManager.getLogger(LogManager.ROOT_LOGGER_NAME);
l.getContext().setConfigLocation(fc);

or alternatively

LoggerContext.getContext().setConfigLocation(java.net.URI);

Solution 5:[5]

You can initialize like below as well

ConfigurationSource source = new ConfigurationSource(new FileInputStream(log4j file Path));
XmlConfiguration xmlConfig = new XmlConfiguration(source);
Logger logger = (Logger) LogManager.getLogger(); 
logger.getContext().start(xmlConfig);

In each class you can get logger instance as below 

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

private final Logger logger = LogManager.getLogger(ABC.class);

Solution 6:[6]

Step: 1 - Get ready with your log4J.xml file with the appender details (Mostly under the resource folder)

Step: 2 - Following code should be added to the configuration class (In the previous log4J we had PropertyConfigurator and now we need to go with LoggerContext)

String log4JFilePath = "file path of your log4J.xml file";
LoggerContext loggerContext = (LoggerContext)LoggerManager.getContext(false);
File file = new File(log4JFilePath);
loggerContext.setConfigLocation(file.toURI());

Step: 3 - Add the following line to utilise the logger in any classes

private static final Logger logger = LogManager.getLogger(yourClassName.class);

logger.info("log here");

Solution 7:[7]

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.core.config.Configurator;

public class Foo {
    public static void main(String[] args) {

     Configurator.initialize(null, "src/main/config/log4j2.xml"); //path specify

     Logger logger = LogManager.getLogger(APITestToolMain.class);
     logger.info("working");
    }
}

resource: https://www.baeldung.com/spring-boot-change-log4j2-location

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Glenn McElhoe
Solution 2 Atul
Solution 3 mgrubovic
Solution 4 Haphil
Solution 5 KalyanM
Solution 6 Pushparaj
Solution 7 Supun Sandaruwan

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