If a property in an ActionBean begins with an uppercase (e.g. Username), despite the correct getter and setter (e.g. getUsername/setUsername), the validation message is not shown by a .jsp file (<stripes: errors />). If the property is changed with "username", validation is displayed.
Win 7, JDK 1.8.0_66, Netbeans 8.0.2, Glassfish 4.1