diff --git a/src/main/java/org/gcube/portlets/widgets/ckan2zenodopublisher/server/CkanToZenodoPublisherServiceImpl.java b/src/main/java/org/gcube/portlets/widgets/ckan2zenodopublisher/server/CkanToZenodoPublisherServiceImpl.java
index dfac229..b5cd61a 100644
--- a/src/main/java/org/gcube/portlets/widgets/ckan2zenodopublisher/server/CkanToZenodoPublisherServiceImpl.java
+++ b/src/main/java/org/gcube/portlets/widgets/ckan2zenodopublisher/server/CkanToZenodoPublisherServiceImpl.java
@@ -196,6 +196,9 @@ public class CkanToZenodoPublisherServiceImpl extends RemoteServiceServlet imple
 			//TODO I'M WAITING FOR itemName retrieved from ckan2zenodo library
 			zenodoItem.setName(item.getItemId());
 			
+			//LOG.info("zenodoItem setting metadata null");
+			//zenodoItem.setMetadata(null);
+			
 			LOG.debug("Returning item: "+zenodoItem);
 			
 			return zenodoItem;
diff --git a/src/main/java/org/gcube/portlets/widgets/ckan2zenodopublisher/shared/wrapped/ZenodoContributor.java b/src/main/java/org/gcube/portlets/widgets/ckan2zenodopublisher/shared/wrapped/ZenodoContributor.java
index 37e9e31..fb159fc 100644
--- a/src/main/java/org/gcube/portlets/widgets/ckan2zenodopublisher/shared/wrapped/ZenodoContributor.java
+++ b/src/main/java/org/gcube/portlets/widgets/ckan2zenodopublisher/shared/wrapped/ZenodoContributor.java
@@ -1,5 +1,7 @@
 package org.gcube.portlets.widgets.ckan2zenodopublisher.shared.wrapped;
 
+import java.io.Serializable;
+
 import org.gcube.portlets.widgets.ckan2zenodopublisher.shared.SerializableEnum;
 
 
@@ -10,7 +12,7 @@ import org.gcube.portlets.widgets.ckan2zenodopublisher.shared.SerializableEnum;
  * 
  * Jan 15, 2020
  */
-public class ZenodoContributor extends ZenodoCreator{
+public class ZenodoContributor extends ZenodoCreator implements Serializable {
 	
 	/**
 	 *