Log4J Interpolation

log4j.java

///usr/bin/env jbang "$0" "$@" ; exit $?
//DEPS org.apache.logging.log4j:log4j-core:2.14.0
//DEPS org.apache.logging.log4j:log4j-api:2.14.0
//RUNTIME_OPTIONS -Dlog4j2.enableJndiLookup=true -Dtest.system.property=the-test-value

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.*;
import org.apache.logging.log4j.core.config.builder.impl.BuiltConfiguration;

public class log4j {

    public static void main(String... args) {
        System.out.println("JNDI lookup: " + System.getProperty("log4j2.enableJndiLookup"));
        System.out.println("Test system property: " + System.getProperty("test.system.property"));
        ConfigurationBuilder<BuiltConfiguration> builder
                = ConfigurationBuilderFactory.newConfigurationBuilder();
        AppenderComponentBuilder console = builder.newAppender("stdout", "Console");

        RootLoggerComponentBuilder rootLogger = builder.newRootLogger(Level.INFO);
        rootLogger.add(builder.newAppenderRef("stdout"));

        LayoutComponentBuilder standard = builder.newLayout("PatternLayout");
        standard.addAttribute("pattern", "%d [%t] %-5level: [${sys:test.system.property}] %msg%n%throwable");

        console.add(standard);
        builder.add(console);
        builder.add(rootLogger);
        Configurator.initialize(builder.build());


        String value = "${sys:test.system.property}";
        final Logger log = LogManager.getLogger(log4j.class);
        log.info("Will this concatenation get interpreted?: " + value);
        log.info("Will this interpolation get interpreted?: {}", value);
    }
}