diff --git a/src/main/java/org/gcube/portal/social/networking/ws/utils/TokensUtils.java b/src/main/java/org/gcube/portal/social/networking/ws/utils/TokensUtils.java
index 9c5fc8f..85511b6 100644
--- a/src/main/java/org/gcube/portal/social/networking/ws/utils/TokensUtils.java
+++ b/src/main/java/org/gcube/portal/social/networking/ws/utils/TokensUtils.java
@@ -2,17 +2,18 @@ package org.gcube.portal.social.networking.ws.utils;
 
 import org.gcube.common.authorization.library.ClientType;
 import org.gcube.common.authorization.library.utils.Caller;
+import org.slf4j.LoggerFactory;
 
 
 /**
  * Tokens utils methods
- * @author Costantino Perciante at ISTI-CNR (costantino.perciante@isti.cnr.it)
  */
 public class TokensUtils {
 	
 	// a user context token (not qualified) has as qualifier the word "TOKEN"
 	private static final String DEFAULT_QUALIFIER_USER_TOKEN = "TOKEN";
-
+	// Logger
+	private static final org.slf4j.Logger logger = LoggerFactory.getLogger(TokensUtils.class);
 	/**
 	 * Check if it is a service token
 	 * @return a boolean value
@@ -50,7 +51,8 @@ public class TokensUtils {
 	 * Check if it is a user token
 	 * @return a boolean value
 	 */
-	public static boolean isUserToken(Caller caller){
+	public static boolean isUserToken(Caller caller) {
+		logger.debug("\n ****** \n isUserToken: caller.getClient().getType().equals(ClientType.USER) => " + caller.getClient().getType().equals(ClientType.USER));
 		String username = caller.getClient().getId();
 		if (username.startsWith("service-account-")) {
 			return false;