Components and classes that provide specialized, validating text fields. The component ValidField does most of the work, and is paired with an implementation of IValidator (often as a helper bean) which provides the rules of translation (between object value and string) and validation.

Fields can all be set as required or not; most IValidator implementations add additional validations, such as fitting the input value between a minimum and maximum value.

Fields can also have a FieldLabel that reflects the state (normal or error) of the field.