Add flush to commit changes.

wise-webapp/src/main/java/com/wisemapping/dao/UserManagerImpl.java

@@ -123,6 +123,7 @@ public class UserManagerImpl
         final HibernateTemplate template = getHibernateTemplate();
         collaborations.forEach(c -> template.delete(c));
         template.delete(collaborator);
+        template.flush();
 
         // Save all new...
         this.createUser(user);