Struts and Spring MVC both have the ability to map a particular exception to a particular page. Struts goes a bit further and allows you to map an exception to an ExceptionHandler - allowing the user to wrap Exceptions in ActionErrors and return the user to where they came from (i.e. the INPUT).

I'd be nice to have a similar feature in WebWork. Struts allows you to specify this at a global level or at an action level. Spring is simply a global level.

Spring Example:

<bean id="exceptionResolver"
        class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
        <property name="exceptionMappings">
            <props>
                <prop key="org.springframework.dao.DataAccessException">
                    dataAccessFailure
                </prop>
            </props>
        </property>
    </bean>

Struts Example:

<exception
        key="exception.database.error"
        type="net.reumann.DatabaseException"
        path="/dataAccessFailure.jsp"/>

I have a sample app I can quickly and easily test this functionality with.