#567 fix version and javadoc

marker/src/main/java/App.java

@@ -1,3 +1,6 @@
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 /**
  * Created by Alexis on 28-Apr-17.
  * With Marker interface idea is to make empty interface and extend it.
@@ -25,13 +28,14 @@ public class App {
    */
   public static void main(String[] args) {
 
+    final Logger logger = LoggerFactory.getLogger(App.class);
     Guard guard = new Guard();
     Thief thief = new Thief();
 
     if (guard instanceof Permission) {
       guard.enter();
     } else {
-      System.out.println("You have no permission to enter, please leave this area");
+      logger.info("You have no permission to enter, please leave this area");
     }
 
     if (thief instanceof Permission) {

marker/src/main/java/Guard.java

@@ -1,10 +1,15 @@
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 /**
- * Created by Alexis on 29-Apr-17.
+ * Class defining Guard
  */
 public class Guard implements Permission {
 
-  protected static void enter() {
-    System.out.println("You can enter");
-  }
+  private static final Logger LOGGER = LoggerFactory.getLogger(Guard.class);
 
+  protected static void enter() {
+
+    LOGGER.info("You can enter");
+  }
 }

marker/src/main/java/Permission.java

@@ -1,5 +1,4 @@
 /**
- * Created by Alexis on 29-Apr-17.
  * Interface without any methods
  * Marker interface is based on that assumption
  */

marker/src/main/java/Thief.java

@@ -1,12 +1,18 @@
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 /**
- * Created by Alexis on 02-May-17.
+ * Class defining Thief
  */
 public class Thief {
+
+  private static final Logger LOGGER = LoggerFactory.getLogger(Thief.class);
+
   protected static void steal() {
-    System.out.println("Steal valuable items");
+    LOGGER.info("Steal valuable items");
   }
 
   protected static void doNothing() {
-    System.out.println("Pretend nothing happened and just leave");
+    LOGGER.info("Pretend nothing happened and just leave");
   }
 }