Spring - Commons Validator: found the missing link.
In trying to get the Spring/Commons-Validator integration working :x I discovered a misconception that setting up the validator-rules.xml with commons validators would automagically bind errors. They didn't. But a FieldChecks class in org.springframework.validation.commons package does (it's in the sandbox). The following validation-rules.xml entry show how to access it.
Code:
<form-validation>
<global>
<validator name="emailFormat"
classname="org.springframework.validation.commons.FieldChecks"
method="validateEmail"
methodParams="java.lang.Object,
org.apache.commons.validator.ValidatorAction,
org.apache.commons.validator.Field,
org.springframework.validation.Errors"
msg="errors.invalid"/>
</global>
</form-validation>
Thanks for the good work, Daniel. Hopefully, it will make it out in 1.2 final (Hint, Hint).