Validating Input Text fields ADF

 <af:convertNumber integerOnly="true" groupingUsed="false"
                          type="number" maxIntegerDigits="3"
                          maxFractionDigits="0" minFractionDigits="0"/>
        <af:validateLongRange minimum="0" maximum="500"/>

http://technology.amis.nl/2007/06/19/rich-validation-functionality-in-oracle-adf-faces-11g-rich-components/