<?xml version="1.0" encoding="UTF-8"?>
<beans:beans...>
    ...
<annotation-driven enable-matrix-variables="true" validator="validator"/> ➊
    ...
<beans:bean id="messageSource"
            class="org.springframework.context.support.ResourceBundleMessageSource">
    <beans:property name="basename" value="messages"/>
    <beans:property name="defaultEncoding" value="UTF-8"/>
</beans:bean>

<beans:bean id="validator" 

➋

            class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean">
    <beans:property name="validationMessageSource" ref="messageSource"/>
</beans:bean>

<beans:bean id="unitsInStockValidator"
            class="com.springmvc.validator.UnitsInStockValidator"/> ➌

➍

<beans:bean id="bookValidator" class="com.springmvc.validator.BookValidator">
    <beans:property name="springValidators">
        <beans:set>
            <beans:ref bean="unitsInStockValidator"/>
        </beans:set>
    </beans:property>
</beans:bean>

</beans:beans...>