when session expires all jsf pages had a problem

web/src/main/java/lcsb/mapviewer/bean/UserBean.java

@@ -3,6 +3,7 @@ package lcsb.mapviewer.bean;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
 import java.io.IOException;
+import java.util.Calendar;
 import java.util.Map;
 
 import javax.faces.application.FacesMessage;
@@ -582,6 +583,11 @@ public class UserBean extends AbstractManagedBean {
 		if (authenticationToken == null) {
 			authenticationToken = getUserService().login(Configuration.ANONYMOUS_LOGIN, "");
 		}
+		Calendar now = Calendar.getInstance();
+		now.add(-1, Calendar.MINUTE);
+		if (authenticationToken.getExpires().after(now)) {
+			authenticationToken = getUserService().login(Configuration.ANONYMOUS_LOGIN, "");
+		}
 		return authenticationToken;
 	}