diff --git a/src/main/java/org/gcube/gcat/zulip/ZulipResponse.java b/src/main/java/org/gcube/gcat/zulip/ZulipResponse.java
new file mode 100644
index 0000000..3c64d6e
--- /dev/null
+++ b/src/main/java/org/gcube/gcat/zulip/ZulipResponse.java
@@ -0,0 +1,57 @@
+package org.gcube.gcat.zulip;
+
+import java.io.IOException;
+
+import org.gcube.com.fasterxml.jackson.core.JsonProcessingException;
+import org.gcube.com.fasterxml.jackson.databind.JsonNode;
+import org.gcube.com.fasterxml.jackson.databind.ObjectMapper;
+
+/**
+ * @author Luca Frosini (ISTI - CNR)
+ */
+public class ZulipResponse {
+	
+	public static final String RESULT_KEY = "result";
+	public static final String MSG_KEY = "msg";
+	
+	public enum Result {
+		success,
+		error
+	}
+	
+	protected ObjectMapper objectMapper;
+	
+	protected String responseString;
+	protected JsonNode response;
+	
+	protected Result result;
+	protected String message; 
+	
+	public ZulipResponse(String responseString) {
+		this.responseString = responseString;
+		this.objectMapper = new ObjectMapper();
+	}
+	
+	public Result getResponseResult() throws JsonProcessingException, IOException {
+		if(result==null) {
+			String resultString = getResponse().get(RESULT_KEY).asText();
+			result = Result.valueOf(resultString);
+		}
+		return result;
+	}
+	
+	public String getResponseMessage() throws JsonProcessingException, IOException {
+		if(message==null) {
+			message = getResponse().get(MSG_KEY).asText();
+		}
+		return message;
+	}
+	
+	public JsonNode getResponse() throws JsonProcessingException, IOException {
+		if(response == null) {
+			response = objectMapper.readTree(responseString);
+		}
+		return response;
+	}
+	
+}
diff --git a/src/main/java/org/gcube/gcat/social/ZulipStream.java b/src/main/java/org/gcube/gcat/zulip/ZulipStream.java
similarity index 75%
rename from src/main/java/org/gcube/gcat/social/ZulipStream.java
rename to src/main/java/org/gcube/gcat/zulip/ZulipStream.java
index b815657..caad424 100644
--- a/src/main/java/org/gcube/gcat/social/ZulipStream.java
+++ b/src/main/java/org/gcube/gcat/zulip/ZulipStream.java
@@ -1,17 +1,23 @@
-package org.gcube.gcat.social;
+package org.gcube.gcat.zulip;
 
 import java.util.HashSet;
 import java.util.Set;
 
+import javax.ws.rs.InternalServerErrorException;
+
+import org.gcube.com.fasterxml.jackson.databind.JsonNode;
 import org.gcube.com.fasterxml.jackson.databind.ObjectMapper;
 import org.gcube.com.fasterxml.jackson.databind.node.ArrayNode;
 import org.gcube.com.fasterxml.jackson.databind.node.ObjectNode;
 import org.gcube.gcat.persistence.ckan.CKANUser;
+import org.gcube.gcat.zulip.ZulipResponse.Result;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import io.taliox.zulip.ZulipRestExecutor;
+import io.taliox.zulip.calls.ZulipRestAPICall;
 import io.taliox.zulip.calls.messages.PostMessage;
+import io.taliox.zulip.calls.streams.GetStreamID;
 import io.taliox.zulip.calls.streams.PostCreateStream;
 
 /**
@@ -31,6 +37,7 @@ public class ZulipStream {
 	protected Set<String> moderators;
 	
 	protected ObjectMapper objectMapper;
+	
 	protected ZulipRestExecutor zulipRestExecutor;
 	
 	public ZulipStream(String email, String password) {
@@ -55,6 +62,13 @@ public class ZulipStream {
 		return streamName;
 	}
 	
+	protected Integer getStreamID() throws Exception {
+		GetStreamID getStreamID = new GetStreamID(getStreamName());
+		ZulipResponse zulipResponse = executeZulipCall(getStreamID);
+		JsonNode response = zulipResponse.getResponse();
+		return response.get("stream_id").asInt();
+	}
+	
 	protected String getStreamDescription() {
 		if(streamDescription==null) {
 			streamDescription = String.format("This stream is used to discuss about the moderation of the item '{}' with id '{}'", itemName, itemID);
@@ -62,7 +76,16 @@ public class ZulipStream {
 		return streamDescription;
 	}
 	
-	public void create() {
+	protected ZulipResponse executeZulipCall(ZulipRestAPICall call) throws Exception {
+		String responseString = zulipRestExecutor.executeCall(call);
+		ZulipResponse zulipResponse = new ZulipResponse(responseString);
+		if(zulipResponse.getResponseResult()==Result.error) {
+			throw new InternalServerErrorException(zulipResponse.getResponseMessage());
+		}
+		return zulipResponse;
+	}
+	
+	public void create() throws Exception {
 		ArrayNode streamsArrayNode = objectMapper.createArrayNode();
 		ObjectNode streamobjectNode = objectMapper.createObjectNode();
 		streamobjectNode.put("name", getStreamName());
@@ -83,8 +106,8 @@ public class ZulipStream {
 		postCreateStream.setInvite_only(true);
 		postCreateStream.setAnnounce(false);
 		
-		String response = zulipRestExecutor.executeCall(postCreateStream);
-		logger.trace(response);
+		executeZulipCall(postCreateStream);
+		
 	}
 	
 	private void postMessageToStream(String topic, String message) {