The Jelly taglib TextArea supports FormValidation Whereas a SecretTextArea does not.

It should be possible to use SecretTextArea with form validation just like Password, or TextArea (or mostly any other form field).

Whilst it may sound strange to some that a secret block of text should be validated, this is useful for things like PEM encoded keys where the validation should be able to check that the text is indeed a PEM encoded key, or that it matches a certificate given in another field.