JSF 1.2/Seam 2.2 - validator is skipped when input it empty?

That's not possible in JSF 1.x. That's only possible since JSF 2.0 (in favour of JSR303 Bean Validation support).

As mentioned already, validating an empty input String in a JSF 1.2 component is not supported. However, you can check for this null/empty model value in your backing bean on form submit and add a FacesMessage that is mapped to that specific input field. This would allow integration with server-side component-specific error message display ().

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