diff --git a/pom.xml b/pom.xml
index b5c5bfd..ea435a7 100644
--- a/pom.xml
+++ b/pom.xml
@@ -118,6 +118,17 @@
 			<artifactId>aslcore</artifactId>
 			<scope>provided</scope>
 		</dependency>
+		
+		<dependency>
+			<groupId>org.gcube.portlets.user</groupId>
+			<artifactId>gcube-widgets</artifactId>
+		</dependency>
+		
+		<dependency>
+			<groupId>org.gcube.portlets.widgets</groupId>
+			<artifactId>session-checker</artifactId>
+			<version>[0.0.0-SNAPSHOT,1.0.0-SNAPSHOT)</version>
+		</dependency>
 
 
 		<!-- <dependency> -->
diff --git a/src/main/java/org/gcube/portlets/user/databasesmanager/client/DatabasesManager.java b/src/main/java/org/gcube/portlets/user/databasesmanager/client/DatabasesManager.java
index 3f31948..bf208a6 100644
--- a/src/main/java/org/gcube/portlets/user/databasesmanager/client/DatabasesManager.java
+++ b/src/main/java/org/gcube/portlets/user/databasesmanager/client/DatabasesManager.java
@@ -12,6 +12,7 @@ import com.google.gwt.user.client.ui.RootPanel;
 import org.gcube.portlets.user.databasesmanager.client.panels.GxtBorderLayoutPanel;
 import org.gcube.portlets.user.databasesmanager.client.resources.Resources;
 import org.gcube.portlets.user.databasesmanager.client.utils.ConstantsPortlet;
+import org.gcube.portlets.widgets.sessionchecker.client.CheckSession;
 
 /**
  * @author "Loredana Liccardo  loredana.liccardo@isti.cnr.it"
@@ -31,6 +32,8 @@ public class DatabasesManager implements EntryPoint {
 	 */
 
 	public void onModuleLoad() {
+		
+		CheckSession.getInstance().startPolling();
 
 		HandlerManager eventBus = new HandlerManager(this);
 
diff --git a/src/main/java/org/gcube/portlets/user/databasesmanager/server/GWTdbManagerServiceImpl.java b/src/main/java/org/gcube/portlets/user/databasesmanager/server/GWTdbManagerServiceImpl.java
index 55b3454..01bd834 100644
--- a/src/main/java/org/gcube/portlets/user/databasesmanager/server/GWTdbManagerServiceImpl.java
+++ b/src/main/java/org/gcube/portlets/user/databasesmanager/server/GWTdbManagerServiceImpl.java
@@ -115,7 +115,7 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 			// config.setOverflowToDisk(true);
 
 		} catch (Exception e) {
-			logger.error("dbmanager-> Failed to get cache: " + e);
+			logger.error("dbmanager-> Failed to get cache: ", e);
 			// e.printStackTrace();
 			throw e;
 		}
@@ -152,7 +152,7 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 
 		} catch (Exception e) {
 			// TODO: handle exception
-			logger.error("dbmanager-> " + e);
+			logger.error("dbmanager-> ", e);
 			// e.printStackTrace();
 		}
 
@@ -279,7 +279,7 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 			// TODO: handle exception
 			// e.printStackTrace();
 			// throw new Exception("Failed to load data. " + e);
-			logger.error("dbmanager-> " + e);
+			logger.error("dbmanager-> ", e);
 			throw e;
 		}
 		// }
@@ -377,7 +377,7 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 			// TODO: handle exception
 			// e.printStackTrace();
 			// throw new Exception("Failed to load data " + );
-			logger.error("dbmanager-> " + e);
+			logger.error("dbmanager-> ", e);
 			throw e;
 		}
 
@@ -486,7 +486,7 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 			// TODO: handle exception
 			// e.printStackTrace();
 			// throw new Exception("Failed to load data. " + e);
-			logger.error("dbmanager-> " + e);
+			logger.error("dbmanager-> ", e);
 			throw e;
 
 		}
@@ -607,7 +607,7 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 		} catch (Exception e) {
 			// e.printStackTrace();
 			// throw new Exception("Failed to load data. " + e);
-			logger.error("dbmanager-> " + e);
+			logger.error("dbmanager-> ", e);
 			throw e;
 		}
 
@@ -878,7 +878,7 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 							"javax.xml.ws.soap.SOAPFaultException: java.lang.IndexOutOfBoundsException")) {
 				e = new Exception("ServerException");
 			}
-			logger.error("dbmanager-> " + e);
+			logger.error("dbmanager-> ", e);
 			throw e;
 		}
 
@@ -1674,7 +1674,7 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 		} catch (Exception e) {
 			logger.info("dbmanager-> startComputation: the job submit has failed!");
 			// e.printStackTrace();
-			logger.error("dbmanager-> " + e);
+			logger.error("dbmanager-> ", e);
 			throw e;
 		}
 	}
@@ -1752,7 +1752,7 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 		if (smResType.equals(SMResourceType.ERROR)) {
 			Exception e = new Exception(smResource.description());
 			// e.printStackTrace();
-			logger.error("dbmanager-> " + e);
+			logger.error("dbmanager-> ", e);
 			throw e;
 		}
 	}
@@ -1880,7 +1880,7 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 				logger.info("dbmanager-> Could not remove the computation ID "
 						+ computationId + " corresponding to jobID "
 						+ uidSubmitQuery);
-				logger.error("dbmanager-> " + e);
+				logger.error("dbmanager-> ", e);
 			}
 		}
 		// remove job status
@@ -2015,7 +2015,7 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 			employeeCache.remove(key);
 		} catch (Exception e) {
 			// TODO: handle exception
-			logger.error("dbmanager-> " + e);
+			logger.error("dbmanager-> ", e);
 			throw new Exception("Failure to clear the cache. " + e);
 		}
 	}
@@ -2050,7 +2050,7 @@ public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
 			}
 
 		} catch (Exception e) {
-			logger.error(e);
+			logger.error("dbmanager-> ", e);
 			throw e;
 
 		} finally {
diff --git a/src/main/resources/org/gcube/portlets/user/databasesmanager/DatabasesManager.gwt.xml b/src/main/resources/org/gcube/portlets/user/databasesmanager/DatabasesManager.gwt.xml
index 7302a74..c7551cd 100644
--- a/src/main/resources/org/gcube/portlets/user/databasesmanager/DatabasesManager.gwt.xml
+++ b/src/main/resources/org/gcube/portlets/user/databasesmanager/DatabasesManager.gwt.xml
@@ -14,9 +14,14 @@
   <!-- Inherit the default GWT style sheet.  You can change       -->
   <!-- the theme of your GWT application by uncommenting          -->
   <!-- any one of the following lines.                            -->
-  <inherits name='com.google.gwt.user.theme.standard.Standard' />
+<!--   <inherits name='com.google.gwt.user.theme.standard.Standard' /> -->
   <!-- <inherits name='com.google.gwt.user.theme.chrome.Chrome'/> -->
   <!-- <inherits name='com.google.gwt.user.theme.dark.Dark'/>     -->
+  
+  <inherits name='org.gcube.portlets.widgets.sessionchecker.SessionChecker' />
+  
+  <!-- inherits gCube Widgets Library  	               -->
+   <inherits name='org.gcube.portlets.user.gcubewidgets.WidgetFactory'/>
 
   <!-- Other module inherits                                      -->
 
diff --git a/src/main/webapp/WEB-INF/web.xml b/src/main/webapp/WEB-INF/web.xml
index e3e898a..bd87f43 100644
--- a/src/main/webapp/WEB-INF/web.xml
+++ b/src/main/webapp/WEB-INF/web.xml
@@ -17,10 +17,15 @@
 		<servlet-class>com.google.gwt.junit.server.JUnitHostImpl</servlet-class>
 	</servlet>
 
-<!-- 	<servlet> -->
-<!-- 		<servlet-name>jUnitHostImpl</servlet-name> -->
-<!-- 		<servlet-class>com.google.gwt.junit.server.JUnitHostImpl</servlet-class> -->
-<!-- 	</servlet> -->
+	<!-- <servlet> -->
+	<!-- <servlet-name>jUnitHostImpl</servlet-name> -->
+	<!-- <servlet-class>com.google.gwt.junit.server.JUnitHostImpl</servlet-class> -->
+	<!-- </servlet> -->
+
+	<servlet>
+		<servlet-name>checkServlet</servlet-name>
+		<servlet-class>org.gcube.portlets.widgets.sessionchecker.server.SessionCheckerServiceImpl</servlet-class>
+	</servlet>
 
 
 	<servlet-mapping>
@@ -37,6 +42,11 @@
 		<servlet-name>jUnitHostImpl</servlet-name>
 		<url-pattern>/databasesmanager/junithost/*</url-pattern>
 	</servlet-mapping>
+	
+	<servlet-mapping>
+		<servlet-name>checkServlet</servlet-name>
+		<url-pattern>/databasesmanager/checksession</url-pattern>
+	</servlet-mapping>
 
 
 	<!-- Default page to serve -->