group and cleanup (#3027)

* move security content from spring-security-rest-full

* swagger update

* move query language to new module

* rename spring-security-rest-full to spring-rest-full

* group persistence modules

* group testing modules

* try fix conflict

* cleanup

* group and cleanup

logging-modules/log4j/src/main/java/com/baeldung/logback/LogbackRollingExample.java

@@ -0,0 +1,19 @@
+package com.baeldung.logback;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.stream.IntStream;
+
+public class LogbackRollingExample {
+
+    private static final Logger logger = LoggerFactory.getLogger(LogbackRollingExample.class);
+
+    public static void main(String[] args) throws InterruptedException {
+        for(int i = 0; i<2000; i++){
+            logger.info("This is the {} time I say 'Hello World'.", i);
+            Thread.sleep(100);
+        }
+    }
+
+}