View view = new View(); Field field = ComponentFactory.createField(LabelFieldType.class); field.setPropertyName("username"); view.addField(field); View view = KRADUtils.createLookupView(myDataObject); view.setViewId("myView"); public class CustomValidator implements Validator { public boolean validate(ViewModel model, Field field) { } } KRADUtils.getValidationHandler().addValidator("myValidator", new CustomValidator());