how to use jsp:include inside a custom tag?

[Richard Sand]

I want to do a jsp:include inside a custom tag, but Tomcat gives me:

java.io.IOException: Illegal to flush within a custom tag

My JSP is:

<ipa:ifUserLoggedIn>
   <jsp:include page="/footers/logged_in.html" flush="true"/>
</ipa:ifUserLoggedIn>

Is there another way to do this?  I have had this code running on other app
servers without any problems.  Is this a case of Tomcat more strictly
adhering to specs? Any help greatly appreciated!

Best regards,

Richard