JAVA-14450: fix log4j2 MapAppender, and JSONLayout integration tests (#12681)

logging-modules/log4j2/src/main/java/com/baeldung/logging/log4j2/consoleandfile/Log4j2ConsoleAndFile.java

@@ -7,6 +7,8 @@ public class Log4j2ConsoleAndFile {
 
     private static final Logger logger = LogManager.getLogger(Log4j2ConsoleAndFile.class);
 
+    // To enable the console and file appender, just rename the log4j2 file, under /src/main/resources, to log4j2.properties
+    // Reason: Having the log4j2.properties file overrides the log4j2.xml file, so that other appender classes would not work
     public static void main(String[] args) {
         logger.info("Hello World!");
         logger.debug("Hello World!");

logging-modules/log4j2/src/test/java/com/baeldung/logging/log4j2/appender/MapAppenderIntegrationTest.java

@@ -23,13 +23,15 @@ public class MapAppenderIntegrationTest {
 
     @Test
     public void whenLoggerEmitsLoggingEvent_thenAppenderReceivesEvent() throws Exception {
-        logger.error("Error log message from {}", this.getClass()
-            .getSimpleName());
         LoggerContext context = LoggerContext.getContext(false);
         Configuration config = context.getConfiguration();
         MapAppender appender = config.getAppender("MapAppender");
+        int eventSizeBeforeLog = appender.getEventMap()
+          .size();
+        logger.error("Error log message from {}", this.getClass()
+          .getSimpleName());
         assertEquals(appender.getEventMap()
-            .size(), 1);
+          .size(), ++eventSizeBeforeLog);
     }
 
 }