Version 6
    If you  cannot or don't want to rely on auto-configuration of Hibernate  Validator, for example in a JPA 1 environment and you are using Spring,  all one needs to do is this:
    <bean id="validationFactory" class="javax.validation.Validation"
              factory-method="buildDefaultValidatorFactory" />
    <bean id="beanValidationEventListener" class="org.hibernate.cfg.beanvalidation.BeanValidationEventListener">
       <constructor-arg index="0" ref="validationFactory" />
       <constructor-arg index="1">

    To wire these beans into the sessionfactory in hibernate, this  is all that needs to be done given the other bean definitions:


    <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="eventListeners">
           <entry key="pre-insert" value-ref="beanValidationEventListener" />
           <entry key="pre-update" value-ref="beanValidationEventListener" />