[JAVA-42524] Added mapAppender programmatically (#18067)

Author: panos-kakos

logging-modules/log4j2/src/test/java/com/baeldung/logging/log4j2/simpleconfiguration/CustomConfigurationFactory.java

@@ -53,10 +53,13 @@ static Configuration createConfiguration(final String name, ConfigurationBuilder
         file.addAttribute("fileName", "target/logging.log");
         file.add(layout);
         builder.add(file);
+        AppenderComponentBuilder mapAppender = builder.newAppender("MapAppender", "MapAppender");
+        builder.add(mapAppender);
         LoggerComponentBuilder logger = builder.newLogger("com", Level.DEBUG);
         logger.add(builder.newAppenderRef("Stdout"));
         logger.add(builder.newAppenderRef("rolling"));
         logger.add(builder.newAppenderRef("FileSystem"));
+        logger.add(builder.newAppenderRef("MapAppender"));
         logger.addAttribute("additivity", false);
         builder.add(logger);
         RootLoggerComponentBuilder rootLogger = builder.newRootLogger(Level.ERROR);