import org.apache.commons.configuration2.Configuration; import org.apache.commons.configuration2.builder.fluent.Configurations; public class AppConfig { public static void main(String[] args) throws Exception { Configurations configs = new Configurations(); String databaseUrl = config.getString("database.url"); String databaseUsername = config.getString("database.username"); String databasePassword = config.getString("database.password"); // ... String logLevel = config.getString("log.level"); // ... boolean securityEnabled = config.getBoolean("security.enabled"); // ... } } properties database.url=jdbc:mysql://localhost:3306/mydb database.username=root database.password=secret log.level=INFO security.enabled=true