diff --git a/src/main/java/org/gcube/portlets/user/workspace/server/GWTWorkspaceServiceImpl.java b/src/main/java/org/gcube/portlets/user/workspace/server/GWTWorkspaceServiceImpl.java
index 1ca8852..3427f09 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/server/GWTWorkspaceServiceImpl.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/server/GWTWorkspaceServiceImpl.java
@@ -60,7 +60,7 @@ import org.gcube.portlets.user.workspace.server.notifications.NotificationsUtil;
 import org.gcube.portlets.user.workspace.server.resolver.UriResolverReaderParameter;
 import org.gcube.portlets.user.workspace.server.shortener.UrlShortener;
 import org.gcube.portlets.user.workspace.server.util.AclTypeComparator;
-import org.gcube.portlets.user.workspace.server.util.DiffereceBetweenInfoContactModel;
+import org.gcube.portlets.user.workspace.server.util.DifferenceBetweenInfoContactModel;
 import org.gcube.portlets.user.workspace.server.util.HttpRequestUtil;
 import org.gcube.portlets.user.workspace.server.util.StringUtil;
 import org.gcube.portlets.user.workspace.server.util.UserUtil;
@@ -1715,7 +1715,7 @@ public class GWTWorkspaceServiceImpl extends RemoteServiceServlet implements GWT
 					sharedFolder.setDescription(folder.getDescription()); //SET NEW DESCRIPTION
 										
 					  //USER REMOVED FROM SHARE
-					DiffereceBetweenInfoContactModel diff2 = new DiffereceBetweenInfoContactModel(listSharedContact, listContacts);
+					DifferenceBetweenInfoContactModel diff2 = new DifferenceBetweenInfoContactModel(listSharedContact, listContacts);
 					List<InfoContactModel> listRemovedUsersFromShare = diff2.getDifferentsContacts();
 					workspaceLogger.info("List removed user from share has size: "+listRemovedUsersFromShare.size());
 					for (InfoContactModel userRemoved : listRemovedUsersFromShare) {
@@ -3062,14 +3062,14 @@ public class GWTWorkspaceServiceImpl extends RemoteServiceServlet implements GWT
 				NotificationsProducer np = getNotificationProducer();
 				
 				workspaceLogger.info("Sending notifications downgrade/upgrade administator/s..");
-				DiffereceBetweenInfoContactModel diff1 = new DiffereceBetweenInfoContactModel(oldAdmins, newAdmins);
+				DifferenceBetweenInfoContactModel diff1 = new DifferenceBetweenInfoContactModel(oldAdmins, newAdmins);
 				List<InfoContactModel> contactsDowngrade = diff1.getDifferentsContacts();
 				
 				for (InfoContactModel infoContactModel : contactsDowngrade) {
 					np.notifyAdministratorDowngrade(infoContactModel, sharedFolder);
 				}
 				
-				DiffereceBetweenInfoContactModel diff2 = new DiffereceBetweenInfoContactModel(newAdmins, oldAdmins);
+				DifferenceBetweenInfoContactModel diff2 = new DifferenceBetweenInfoContactModel(newAdmins, oldAdmins);
 				List<InfoContactModel> contactsUpgrade = diff2.getDifferentsContacts();
 				
 				for (InfoContactModel infoContactModel : contactsUpgrade) {
diff --git a/src/main/java/org/gcube/portlets/user/workspace/server/notifications/NotificationsProducer.java b/src/main/java/org/gcube/portlets/user/workspace/server/notifications/NotificationsProducer.java
index a54abf5..8e34ebd 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/server/notifications/NotificationsProducer.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/server/notifications/NotificationsProducer.java
@@ -15,7 +15,7 @@ import org.gcube.common.homelibrary.home.workspace.WorkspaceItem;
 import org.gcube.common.homelibrary.home.workspace.WorkspaceSharedFolder;
 import org.gcube.common.scope.impl.ScopeBean;
 import org.gcube.portlets.user.workspace.client.model.InfoContactModel;
-import org.gcube.portlets.user.workspace.server.util.DiffereceBetweenInfoContactModel;
+import org.gcube.portlets.user.workspace.server.util.DifferenceBetweenInfoContactModel;
 import org.gcube.portlets.user.workspace.server.util.UserUtil;
 import org.gcube.portlets.user.workspace.server.util.WsUtil;
 
@@ -241,7 +241,7 @@ public class NotificationsProducer {
 				  try{
 					  
 					  //NEW USER SHARED
-					  DiffereceBetweenInfoContactModel diff = new DiffereceBetweenInfoContactModel(listSharingContact, listSharedContact);
+					  DifferenceBetweenInfoContactModel diff = new DifferenceBetweenInfoContactModel(listSharingContact, listSharedContact);
 					  
 					  List<InfoContactModel> listNewContactsShared = diff.getDifferentsContacts();
 					  
@@ -307,7 +307,7 @@ public class NotificationsProducer {
 					  }
 					  
 					  //USER REMOVED FROM SHARE
-					  DiffereceBetweenInfoContactModel diff2 = new DiffereceBetweenInfoContactModel(listSharedContact, listSharingContact);
+					  DifferenceBetweenInfoContactModel diff2 = new DifferenceBetweenInfoContactModel(listSharedContact, listSharingContact);
 					  
 					  List<InfoContactModel> listRemovedUsersFromShare = diff2.getDifferentsContacts();
 					  
diff --git a/src/main/java/org/gcube/portlets/user/workspace/server/util/DiffereceBetweenInfoContactModel.java b/src/main/java/org/gcube/portlets/user/workspace/server/util/DifferenceBetweenInfoContactModel.java
similarity index 93%
rename from src/main/java/org/gcube/portlets/user/workspace/server/util/DiffereceBetweenInfoContactModel.java
rename to src/main/java/org/gcube/portlets/user/workspace/server/util/DifferenceBetweenInfoContactModel.java
index f7db709..36dfd6a 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/server/util/DiffereceBetweenInfoContactModel.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/server/util/DifferenceBetweenInfoContactModel.java
@@ -7,13 +7,14 @@ import org.gcube.portlets.user.workspace.client.model.InfoContactModel;
 
 
 
+
 /**
- * The Class DiffereceBetweenInfoContactModel.
+ * The Class DifferenceBetweenInfoContactModel.
  *
  * @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it
  * Nov 19, 2015
  */
-public class DiffereceBetweenInfoContactModel {
+public class DifferenceBetweenInfoContactModel {
 	
 	
 	private List<InfoContactModel> listOne;
@@ -25,7 +26,7 @@ public class DiffereceBetweenInfoContactModel {
 	 * @param listA the list a
 	 * @param listB the list b
 	 */
-	public DiffereceBetweenInfoContactModel(List<InfoContactModel> listA, List<InfoContactModel> listB){
+	public DifferenceBetweenInfoContactModel(List<InfoContactModel> listA, List<InfoContactModel> listB){
 		this.listOne = listA;
 		this.listTwo = listB;
 	}