diff --git a/src/main/java/org/gcube/portlets/user/td/client/rstudio/RStudio.java b/src/main/java/org/gcube/portlets/user/td/client/rstudio/RStudio.java
index 580bcea..35c4e01 100644
--- a/src/main/java/org/gcube/portlets/user/td/client/rstudio/RStudio.java
+++ b/src/main/java/org/gcube/portlets/user/td/client/rstudio/RStudio.java
@@ -1,10 +1,16 @@
 package org.gcube.portlets.user.td.client.rstudio;
 
+import org.gcube.portlets.user.td.gwtservice.client.rpc.TDGWTServiceAsync;
+import org.gcube.portlets.user.td.gwtservice.shared.exception.TDGWTSessionExpiredException;
+import org.gcube.portlets.user.td.gwtservice.shared.user.UserInfo;
+import org.gcube.portlets.user.td.widgetcommonevent.client.event.SessionExpiredEvent;
+import org.gcube.portlets.user.td.widgetcommonevent.client.type.SessionExpiredType;
 import org.gcube.portlets.user.td.widgetcommonevent.shared.TRId;
 
 import com.allen_sauer.gwt.log.client.Log;
 import com.google.gwt.core.client.GWT;
 import com.google.gwt.user.client.Window;
+import com.google.gwt.user.client.rpc.AsyncCallback;
 import com.google.web.bindery.event.shared.EventBus;
 
 /**
@@ -18,24 +24,49 @@ import com.google.web.bindery.event.shared.EventBus;
  */
 public class RStudio {
 	private static final String TAB_RESOURCE_ID_PARAMETER = "TabResourceId";
-	
-	
+	private TRId trId;
+	private EventBus eventBus;
+
 	public RStudio(TRId trId, EventBus eventBus) {
-		callRStudioServlet(trId);
+		this.trId = trId;
+		this.eventBus = eventBus;
+		callCheckSession();
+
 	}
-	
-	private void callRStudioServlet(TRId trId) {
+
+	private void callRStudioServlet() {
 		Log.debug("Request: " + trId);
 
 		String url = GWT.getModuleBaseURL() + "TDRStudioServlet?"
-				+ TAB_RESOURCE_ID_PARAMETER + "="
-				+ trId.getId();
+				+ TAB_RESOURCE_ID_PARAMETER + "=" + trId.getId();
 		Log.debug("Server URL: " + url);
 		Window.open(url, "RStudio", "");
 
-		
 	}
 
-	
+	private void callCheckSession() {
+		TDGWTServiceAsync.INSTANCE.hello(new AsyncCallback<UserInfo>() {
+
+			@Override
+			public void onFailure(Throwable caught) {
+				Log.info("No valid user found: " + caught.getMessage());
+				if (caught instanceof TDGWTSessionExpiredException) {
+					eventBus.fireEvent(new SessionExpiredEvent(
+							SessionExpiredType.EXPIREDONSERVER));
+				} else {
+					eventBus.fireEvent(new SessionExpiredEvent(
+							SessionExpiredType.EXPIREDONSERVER));
+				}
+			}
+
+			@Override
+			public void onSuccess(UserInfo result) {
+				Log.info("Hello: " + result.getUsername());
+				callRStudioServlet();
+			}
+
+		});
+
+	}
 
 }