diff --git a/pom.xml b/pom.xml
index 476c230..0d68a36 100644
--- a/pom.xml
+++ b/pom.xml
@@ -138,15 +138,15 @@
 			<artifactId>workspace-light-tree</artifactId>
 		</dependency>
 
-		
+
 		<dependency>
 			<groupId>org.gcube.common</groupId>
 			<artifactId>home-library</artifactId>
 			<version>[1.0.0-SNAPSHOT, 2.0.0-SNAPSHOT)</version>
 			<scope>provided</scope>
 		</dependency>
-		
-	
+
+
 
 		<!-- TD Expression -->
 		<dependency>
@@ -192,6 +192,14 @@
 			<version>[1.2.0-SNAPSHOT, 2.0.0-common)</version>
 		</dependency>
 
+		<!-- Session Checker -->
+		<dependency>
+			<groupId>org.gcube.portlets.widgets</groupId>
+			<artifactId>session-checker</artifactId>
+			<version>[0.2.0-SNAPSHOT,1.0.0-SNAPSHOT)</version>
+		</dependency>
+
+
 		<!-- tabular-data-widget-common-event -->
 		<dependency>
 			<groupId>org.gcube.portlets.user</groupId>
@@ -255,15 +263,15 @@
 			<artifactId>tabular-data-table-widget</artifactId>
 			<version>[0.0.1-SNAPSHOT,2.0.0-SNAPSHOT)</version>
 		</dependency>
-		
+
 		<!--tabular-data-information-widget -->
 		<dependency>
 			<groupId>org.gcube.portlets.user</groupId>
 			<artifactId>tabular-data-information-widget</artifactId>
 			<version>[2.0.0-SNAPSHOT,3.0.0-SNAPSHOT)</version>
 		</dependency>
-		
-		<!--  tabular-data-column-widget -->
+
+		<!-- tabular-data-column-widget -->
 		<dependency>
 			<groupId>org.gcube.portlets.user</groupId>
 			<artifactId>tabular-data-column-widget</artifactId>
diff --git a/src/main/java/org/gcube/portlets/user/td/client/TabularDataController.java b/src/main/java/org/gcube/portlets/user/td/client/TabularDataController.java
index efe9fbe..f536636 100644
--- a/src/main/java/org/gcube/portlets/user/td/client/TabularDataController.java
+++ b/src/main/java/org/gcube/portlets/user/td/client/TabularDataController.java
@@ -41,6 +41,7 @@ import org.gcube.portlets.user.td.wizardwidget.client.WizardListener;
 import org.gcube.portlets.user.tdtemplate.client.TdTemplateController;
 import org.gcube.portlets.user.tdwx.client.TabularDataX;
 import org.gcube.portlets.user.tdwx.shared.model.TableId;
+import org.gcube.portlets.widgets.sessionchecker.client.CheckSession;
 
 import com.allen_sauer.gwt.log.client.Log;
 import com.google.gwt.core.client.GWT;
@@ -90,9 +91,15 @@ public class TabularDataController {
 	public TabularDataController() {
 		eventBus = new SimpleEventBus();
 		callHello();
+		checkSession();
 		bindToEvents();
 	}
 
+	protected void checkSession(){
+		//if you do not need to something when the session expire
+		CheckSession.getInstance().startPolling();
+	}
+	
 	/**
 	 * @return the eventBus
 	 */
diff --git a/src/main/java/org/gcube/portlets/user/td/tabulardataportlet.gwt.xml b/src/main/java/org/gcube/portlets/user/td/tabulardataportlet.gwt.xml
index 7711cd4..3b0d9ba 100644
--- a/src/main/java/org/gcube/portlets/user/td/tabulardataportlet.gwt.xml
+++ b/src/main/java/org/gcube/portlets/user/td/tabulardataportlet.gwt.xml
@@ -42,7 +42,9 @@
 
 	<inherits name='org.gcube.portlets.user.td.taskswidget.TdTasksWidget' />
 	<inherits name="org.gcube.portlets.user.tdtemplate.TabularDataTemplate" />
-
+	
+	
+	<inherits name='org.gcube.portlets.widgets.sessionchecker.SessionChecker' />
 
 	<!-- Specify the app entry point class. -->
 	<entry-point class='org.gcube.portlets.user.td.client.TabularDataPortlet' />
diff --git a/src/main/resources/org/gcube/portlets/user/td/tabulardataportlet.gwt.xml b/src/main/resources/org/gcube/portlets/user/td/tabulardataportlet.gwt.xml
index c528538..cab7bcd 100644
--- a/src/main/resources/org/gcube/portlets/user/td/tabulardataportlet.gwt.xml
+++ b/src/main/resources/org/gcube/portlets/user/td/tabulardataportlet.gwt.xml
@@ -38,24 +38,24 @@
 	<inherits
 		name='org.gcube.portlets.widgets.lighttree.WorkspacePortletLightTree' />
 
-
 	<inherits name='org.gcube.portlets.user.td.taskswidget.TdTasksWidget' />
 	<inherits name="org.gcube.portlets.user.tdtemplate.TabularDataTemplate" />
 
-
+	<inherits name='org.gcube.portlets.widgets.sessionchecker.SessionChecker' />	
 
 	<!-- Specify the app entry point class. -->
 	<entry-point class='org.gcube.portlets.user.td.client.TabularDataPortlet' />
-	
-	<!--  <set-property name="log_DivLogger" value="ENABLED" /> <set-property 
+	<!-- 
+    <set-property name="log_DivLogger" value="ENABLED" /> <set-property 
 		name="log_ConsoleLogger" value="ENABLED" /> <set-property name="log_FirebugLogger" 
 		value="ENABLED" /> <set-property name="log_GWTLogger" value="ENABLED" /> 
-		<set-property name="log_SystemLogger" value="ENABLED" /> -->  
+		<set-property name="log_SystemLogger" value="ENABLED" /> -->
+	 
     <set-property name="log_DivLogger" value="DISABLED" />
 	<set-property name="log_ConsoleLogger" value="DISABLED" />
 	<set-property name="log_FirebugLogger" value="DISABLED" />
 	<set-property name="log_GWTLogger" value="DISABLED" />
-	<set-property name="log_SystemLogger" value="DISABLED" /> -->
+	<set-property name="log_SystemLogger" value="DISABLED" /> 
 	<!-- Specify the paths for translatable code -->
 	<source path='client' />
 	<source path='shared' />
diff --git a/src/main/webapp/WEB-INF/web.xml b/src/main/webapp/WEB-INF/web.xml
index a87e9d6..36ce68e 100644
--- a/src/main/webapp/WEB-INF/web.xml
+++ b/src/main/webapp/WEB-INF/web.xml
@@ -113,8 +113,12 @@
 		<servlet-class>com.google.gwt.junit.server.JUnitHostImpl</servlet-class>
 	</servlet>
 
-
-
+	<!-- Check Session Expired -->
+	<servlet>
+		<servlet-name>checkServlet</servlet-name>
+		<servlet-class>org.gcube.portlets.widgets.sessionchecker.server.SessionCheckerServiceImpl</servlet-class>
+	</servlet>
+ 
 	<!-- Servlets Mapping -->
 	<servlet-mapping>
 		<servlet-name>tdservlet</servlet-name>
@@ -216,6 +220,13 @@
 
 	-->
 	
+	
+	<servlet-mapping>
+		<servlet-name>checkServlet</servlet-name>
+		<url-pattern>/tabulardataportlet/checksession</url-pattern>
+	</servlet-mapping>
+	
+	
 	<servlet-mapping>
 		<servlet-name>jUnitHostImpl</servlet-name>
 		<url-pattern>/tabulardataportlet/junithost/*</url-pattern>