Load Log4j2 configuration file programmatically

Question

I want to load Log4j2 XML configuration file programmatically from my application.

Tried this:

ConfigurationSource source = new ConfigurationSource()         


        

Answer 1

Below worked for me, Log4j2 with SLF4J wrapper:

Solution 1:

public class MyClass {

    static {
        try {
            InputStream inputStream = new FileInputStream("C:/path/to/log4j2.xml");
            ConfigurationSource source = new ConfigurationSource(inputStream);
            Configurator.initialize(null, source);
        } catch (Exception ex) {
            // Handle here
        }
    }

    private static final Logger LOGGER = LoggerFactory.getLogger(MyClass.class); // LogManager if not using SLF4J

    public void doSomething() {
        LOGGER.info(...)
    }

}

Solution 2:

static {
    File log4j2File = new File("C:/path/to/log4j2.xml");
    System.setProperty("log4j2.configurationFile", log4j2File.toURI().toString());
}

Need toURI() to follow File URI Scheme format, else it throws MalformedURLException.

Sources:

• Proper format for log4j2.xml RollingFile configuration
• https://github.com/jprante/elasticsearch-jdbc/issues/562
• https://www.codeproject.com/Questions/190269/MalformedURLException-unknown-protocol-c-How-to-ha
• https://coderanch.com/t/633544/open-source/java-net-MalformedURLException-initialize-log