An email address must not exceed 254 characters. This was accepted by the IETF following submitted erratum. A full diagnosis of any given address is available online. The original version of RFC 3696 described 320 as the maximum length, but John Klensin subsequently accepted an incorrect value, since a Path is defined as Path = … Read more
Yes. Just as the error said, in HTML, attributes are #PCDATA meaning they’re parsed. This means you can use character entities in the attributes. Using & by itself is wrong and if not for lenient browsers and the fact that this is HTML not XHTML, would break the parsing. Just escape it as & and … Read more
The easiest custom approach I’ve seen and used as far is to create a <h:inputHidden> field with a <f:validator> wherein you reference all involved components as <f:attribute>. If you declare it before the to-be-validated components, then you can obtain the submitted values inside the validator by UIInput#getSubmittedValue(). E.g. <h:form> <h:inputHidden id=”foo” value=”true”> <f:validator validatorId=”fooValidator” /> … Read more
Using the official java email package is the easiest: public static boolean isValidEmailAddress(String email) { boolean result = true; try { InternetAddress emailAddr = new InternetAddress(email); emailAddr.validate(); } catch (AddressException ex) { result = false; } return result; }
Each field constraint should be handled by a distinct validator annotation, or in other words it’s not suggested practice to have one field’s validation annotation checking against other fields; cross-field validation should be done at the class level. Additionally, the JSR-303 Section 2.2 preferred way to express multiple validations of the same type is via … Read more
In general URIs as defined by RFC 3986 (see Section 2: Characters) may contain any of the following 84 characters: ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~:/?#[]@!$&'()*+,;= Note that this list doesn’t state where in the URI these characters may occur. Any other character needs to be encoded with the percent-encoding (%hh). Each part of the URI has further restrictions about … Read more