Implemented several debug messages in many services

src/main/java/com/l2jserver/service/game/DuelServiceImpl.java

@@ -16,6 +16,9 @@
  */
 package com.l2jserver.service.game;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import com.l2jserver.model.world.L2Character;
 import com.l2jserver.service.AbstractService;
 
@@ -25,6 +28,12 @@ import com.l2jserver.service.AbstractService;
  * @author <a href="http://www.rogiel.com">Rogiel</a>
  */
 public class DuelServiceImpl extends AbstractService implements DuelService {
+	/**
+	 * The logger
+	 */
+	@SuppressWarnings("unused")
+	private final Logger log = LoggerFactory.getLogger(this.getClass());
+	
 	@Override
 	public void start(L2Character character1, L2Character character2) {
 		// TODO Auto-generated method stub