diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/calendars/entities/CalendarExceptionType.java b/navalplanner-business/src/main/java/org/navalplanner/business/calendars/entities/CalendarExceptionType.java
index fe38f6c73..060c9eba2 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/calendars/entities/CalendarExceptionType.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/calendars/entities/CalendarExceptionType.java
@@ -30,6 +30,7 @@ import org.apache.commons.lang.StringUtils;
 import org.apache.commons.lang.Validate;
 import org.hibernate.NonUniqueResultException;
 import org.hibernate.validator.AssertTrue;
+import org.hibernate.validator.NotEmpty;
 import org.hibernate.validator.NotNull;
 import org.navalplanner.business.calendars.daos.ICalendarExceptionTypeDAO;
 import org.navalplanner.business.common.IHumanIdentifiable;
@@ -93,6 +94,7 @@ public class CalendarExceptionType extends IntegrationEntity implements
                 .isTrue(notOverAssignable));
     }
 
+    @NotEmpty(message = "name not specified")
     public String getName() {
         return name;
     }
diff --git a/navalplanner-webapp/src/main/webapp/excetiondays/_editExceptionDayType.zul b/navalplanner-webapp/src/main/webapp/excetiondays/_editExceptionDayType.zul
index e3d2160b0..a6875faa2 100644
--- a/navalplanner-webapp/src/main/webapp/excetiondays/_editExceptionDayType.zul
+++ b/navalplanner-webapp/src/main/webapp/excetiondays/_editExceptionDayType.zul
@@ -50,6 +50,7 @@
                             <textbox id="tbName"
                                 value="@{controller.exceptionDayType.name}"
                                 width="300px"
+                                constraint="no empty:${i18n:_('cannot be null or empty')}"
                                 onBlur="controller.updateWindowTitle()" />
                         </row>
                         <row>