How to mark other components invalid in a custom multi-field validator

Question

I refer to one of BalusC\'s answers: JSF doesn't support cross-field validation, is there a workaround?

I follow the same way, and come out with code as below:

Answer 1

Mark them invalid by UIInput#setValid(), passing false.

input1.setValid(false);
input2.setValid(false);
input3.setValid(false);

The borders are specific to PrimeFaces <p:inputText>, so you don't need to add any CSS boilerplate as suggested by the other answerer.

Note that this can also be achieved by OmniFaces <o:validateAll> tag without the need to homegrow a custom validator.