sitemesh + spring security: show logged in user in main decorator page!

I want to show logged in user in main decorator page. i use :

<decorator:usePage id="myPage"/>
Logged in as:<%= myPage.ge开发者_如何学CtRequest().getUserPrincipal().getName()%>
<decorator:body/>

but not work!

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You need to place the SiteMesh filter-mapping below the Spring Security filter mapping.

See: Spring security tags in sitemesh decorator

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Haven't worked with SiteMesh for quite some time, but why aren't you using the implicit request object instead (I assume your pages are written in JSP, right?)

<%= request.getUserPrincipal().getName() %>

And what's exactly not working? Is an exception getting thrown?