"... but I read comments from people suggesting not to use Spring validators outside Spring MVC ..."
I would like to see these quotes. I used the Spring DataBinding APIs outside of Spring MVC and this is awesome. I would say that criticism is unfounded.
Apache Commons Validator is an alternative, but I still recommend Spring DataBinder. Especially if you are already using Spring. The advantage of switching to something else is more than offset by the cost of another addiction.
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