diff --git a/src/main/java/org/gcube/portal/databook/server/DBCassandraAstyanaxImpl.java b/src/main/java/org/gcube/portal/databook/server/DBCassandraAstyanaxImpl.java
index ccdb58b..f49b767 100644
--- a/src/main/java/org/gcube/portal/databook/server/DBCassandraAstyanaxImpl.java
+++ b/src/main/java/org/gcube/portal/databook/server/DBCassandraAstyanaxImpl.java
@@ -122,18 +122,52 @@ public final class DBCassandraAstyanaxImpl implements DatabookStore {
 	 */
 
 	private static Post feed2post(Feed feed){
-		Post post = new Post(feed.getKey(), PostType.valueOf(feed.getType().toString()), feed.getEntityId(), feed.getTime(),
-				feed.getVreid(), feed.getUri(), feed.getUriThumbnail(), feed.getDescription(), feed.getPrivacy(),
-				feed.getFullName(), feed.getEmail(), feed.getThumbnailURL(), feed.getCommentsNo(),
-				feed.getLikesNo(), feed.getLinkTitle(), feed.getLinkDescription(), feed.getLinkHost(), feed.isApplicationFeed(), feed.isMultiFileUpload());
+		Post post = new Post();
+		if (feed.getKey()!=null)post.setKey(feed.getKey());
+		if (feed.getType()!=null)post.setType(PostType.valueOf(feed.getType().toString()));
+		if (feed.getEntityId()!=null)post.setEntityId(feed.getEntityId());
+		if (feed.getTime()!=null)post.setTime(feed.getTime());
+		if (feed.getVreid()!=null)post.setVreid(feed.getVreid());
+		if (feed.getUri()!=null)post.setUri(feed.getUri());
+		if (feed.getUriThumbnail()!=null)post.setUriThumbnail(feed.getUriThumbnail());
+		if (feed.getDescription()!=null)post.setDescription(feed.getDescription());
+		if (feed.getPrivacy()!=null)post.setPrivacy(feed.getPrivacy());
+		if (feed.getFullName()!=null)post.setFullName(feed.getFullName());
+		if (feed.getEmail()!=null)post.setEmail(feed.getEmail());
+		if (feed.getThumbnailURL()!=null)post.setThumbnailURL(feed.getThumbnailURL());
+		if (feed.getCommentsNo()!=null)post.setCommentsNo(feed.getCommentsNo());
+		if (feed.getLikesNo()!=null)post.setLikesNo(feed.getLikesNo());
+		if (feed.getLinkTitle()!=null)post.setLinkTitle(feed.getLinkTitle());
+		if (feed.getLinkDescription()!=null)post.setLinkDescription(feed.getLinkDescription());
+		if (feed.getLinkHost()!=null)post.setLinkHost(feed.getLinkHost());
+		post.setApplicationFeed(feed.isApplicationFeed());
+		post.setMultiFileUpload(feed.isMultiFileUpload());
 		return post;
 	}
 
 	private static Feed post2feed(Post post){
-		Feed feed = new Feed(post.getKey(), FeedType.valueOf(post.getType().toString()), post.getEntityId(), post.getTime(),
-				post.getVreid(), post.getUri(), post.getUriThumbnail(), post.getDescription(), post.getPrivacy(),
-				post.getFullName(), post.getEmail(), post.getThumbnailURL(), post.getCommentsNo(),
-				post.getLikesNo(), post.getLinkTitle(), post.getLinkDescription(), post.getLinkHost(), post.isApplicationFeed(), post.isMultiFileUpload());
+		Feed feed = new Feed();
+
+		if (post.getKey()!=null)feed.setKey(post.getKey());
+		if (post.getType()!=null)feed.setType(FeedType.valueOf(post.getType().toString()));
+		if (post.getEntityId()!=null)feed.setEntityId(post.getEntityId());
+		if (post.getTime()!=null)feed.setTime(post.getTime());
+		if (post.getVreid()!=null)feed.setVreid(post.getVreid());
+		if (post.getUri()!=null)feed.setUri(post.getUri());
+		if (post.getUriThumbnail()!=null)feed.setUriThumbnail(post.getUriThumbnail());
+		if (post.getDescription()!=null)feed.setDescription(post.getDescription());
+		if (post.getPrivacy()!=null)feed.setPrivacy(post.getPrivacy());
+		if (post.getFullName()!=null)feed.setFullName(post.getFullName());
+		if (post.getEmail()!=null)feed.setEmail(post.getEmail());
+		if (post.getThumbnailURL()!=null)feed.setThumbnailURL(post.getThumbnailURL());
+		if (post.getCommentsNo()!=null)feed.setCommentsNo(post.getCommentsNo());
+		if (post.getLikesNo()!=null)feed.setLikesNo(post.getLikesNo());
+		if (post.getLinkTitle()!=null)feed.setLinkTitle(post.getLinkTitle());
+		if (post.getLinkDescription()!=null)feed.setLinkDescription(post.getLinkDescription());
+		if (post.getLinkHost()!=null)feed.setLinkHost(post.getLinkHost());
+		feed.setApplicationFeed(post.isApplicationFeed());
+		feed.setMultiFileUpload(post.isMultiFileUpload());
+
 		return feed;
 	}
 	/**
@@ -242,8 +276,10 @@ public final class DBCassandraAstyanaxImpl implements DatabookStore {
 		if (timeInMillis > now.getTime())
 			throw new IllegalArgumentException("the timeInMillis must be before today");
 		List<Post> posts = getRecentPostsByUserAndDate(userid, timeInMillis);
+		_log.info("Length of posts is " + posts.size());
 		List<Feed> feeds = new ArrayList<>();
 		for(Post post: posts){
+			_log.info(post.toString());
 			feeds.add(post2feed(post));
 		}
 		return feeds;