Validation explained
Stuts2 uses XWork's validation framework internally. It allows you to validate Models and Actions using a set of specialised (field)validators, grouped together in an xml file named YourModel-validation.xml or ActionName-validation (and, in the case of the alias, ActionName-alias-validation.xml). Since we only want to validate the crud action, we create a file EmployeeAction-crud-validation.xml and place it in our classpath (mostly next to our compiled Action class). < validators > < field name = "employee.firstName" > < field-validator type = "requiredstring" > < message key = "errors.required.firstname" /> </ field-validator > </ field > < field name = "employee.lastName" > < field-validator type = "required...