display error messages

src/main/java/com/commafeed/frontend/model/Entries.java

@@ -8,6 +8,7 @@ import com.google.common.collect.Lists;
 @SuppressWarnings("serial")
 public class Entries implements Serializable {
 	private String name;
+	private String message;
 	private List<Entry> entries = Lists.newArrayList();
 
 	public String getName() {
@@ -26,4 +27,12 @@ public class Entries implements Serializable {
 		this.entries = entries;
 	}
 
+	public String getMessage() {
+		return message;
+	}
+
+	public void setMessage(String message) {
+		this.message = message;
+	}
+
 }

src/main/java/com/commafeed/frontend/rest/resources/EntriesREST.java

@@ -56,6 +56,7 @@ public class EntriesREST extends AbstractREST {
 					getUser(), Long.valueOf(id));
 			if (subscription != null) {
 				entries.setName(subscription.getTitle());
+				entries.setMessage(subscription.getFeed().getMessage());
 				entries.getEntries().addAll(
 						buildEntries(subscription, offset, limit, unreadOnly));
 			}

src/main/java/com/commafeed/frontend/rest/resources/SubscriptionsREST.java

@@ -53,7 +53,15 @@ public class SubscriptionsREST extends AbstractREST {
 		Preconditions.checkNotNull(req.getTitle());
 		Preconditions.checkNotNull(req.getUrl());
 
-		Feed feed = feedService.findByUrl(req.getUrl());
+		Feed fetchedFeed = null;
+		try {
+			fetchedFeed = feedFetcher.fetch(req.getUrl());
+		} catch (FeedException e) {
+			return Response.status(Status.NOT_FOUND).entity(e.getMessage())
+					.build();
+		}
+
+		Feed feed = feedService.findByUrl(fetchedFeed.getUrl());
 		if (feed == null) {
 			feed = new Feed();
 			feed.setUrl(req.getUrl());