yep.
here's what seems to be the minimum to get them going, based on my slightly hit and miss approach.
1. setup handlerMapping, themeInterceptor and themeResolver in *-servlet.xml
<bean id="handlerMapping" class="org.springframework.web.servlet.handler.BeanNameUr lHandlerMapping">
<property name="interceptors">
<list>
<ref local="themeChangeInterceptor"/>
</list>
</property>
</bean>
<bean id="themeResolver" class="org.springframework.web.servlet.theme.SessionTheme Resolver"/>
<bean id="themeChangeInterceptor" class="org.springframework.web.servlet.theme.ThemeChangeI nterceptor"/>
2. setup messageSource to determine at a minimum any themes you have. In this case, 'dev' and 'theme' are themes. 'theme' seems to be the default theme name.
<bean id="messageSource"
class="org.springframework.context.support.ReloadableReso urceBundleMessageSource">
<property name="basenames">
<list>
<value>WEB-INF/usermessages</value>
<value>WEB-INF/dbmessages</value>
<value>WEB-INF/label</value>
<value>WEB-INF/dev</value>
<value>WEB-INF/theme</value>
</list>
</property>
</bean>
3. create properties files referenced in messageResource, e.g. classes/dev.properties. The 'css' property in this file will be used to construct a link reference in your JSP page.
css=/themes/dev/style.css
4. plug theme/CSS resolving into your JSP
<c:set var="css"><spring:theme code="css"/></c:set>
<c:if test="${not empty css}">
<link rel="stylesheet" href="<c:url value='${css}'/>" type="text/css" />
</c:if>
5. put buttons or whatever on jsp page to switch themes, where dev and theme below seem to correspond to the property files referenced in step 2.
<input type="submit" name="theme" value="dev"/>
<input type="submit" name="theme" value="theme"/>