Log4j2Console.java

import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.core.config.Configurator;
import org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilder;
import org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilderFactory;
import org.apache.logging.log4j.core.config.builder.impl.BuiltConfiguration;
import org.apache.logging.log4j.core.layout.PatternLayout;

/**
 * @see
 * <a href="https://stackoverflow.com/questions/30881990/how-to-configure-log4j-2-x-purely-programmatically/58002997#58002997">From
 * Stack Overflow</a>
 */
public class Log4j2Console {
    //Must inintialize in main thread.
    static {
        ConfigurationBuilder<BuiltConfiguration> builder
                = ConfigurationBuilderFactory.newConfigurationBuilder();

        // configure a console appender
        builder.add(
                builder.newAppender("stdout", "Console")
                .add(
                        builder.newLayout(PatternLayout.class.getSimpleName())
                        .addAttribute(
                                "pattern",
                                "%d{HH:mm:ss.SSS} [%t] %highlight{%-5level} %class{1.}.%M(%L) - %highlight{%msg}%n%ex{full}%n"
                        )
                )
        );

        // configure the root logger
        builder.add(
                builder.newRootLogger(Level.INFO)
                .add(builder.newAppenderRef("stdout"))
        // Additional Logger for package
        ).add(builder.newLogger("com.example", Level.DEBUG)
        );

        // apply the configuration
        Configurator.initialize(builder.build());
    }

    public static Logger getLogger(Class<?> clazz) {
        return LogManager.getLogger(clazz);
    }

}