Incorporating action interceptor configuration parameters into a message

[stanlick]

Before I wrap myself around my own axle, does anyone know a straightforward
technique for substituting the maximumSize into a message property text
according to the following scenario.

        <action name="singleUpload" class="FileUploadAction"
            method="upload">
            <interceptor-ref name="fileUpload">
                <param name="maximumSize">100123</param>
                <param name="allowedTypes">
                    image/png,image/x-png
                </param>
            </interceptor-ref>
            <interceptor-ref name="basicStack" />
            <result name="input">/jsp/SingleUpload.jsp</result>
            <result>/jsp/Confirm.jsp</result>
        </action>

struts.messages.error.file.too.large=File {1} is {3} bytes which exceeds the
maximum DDDDDD

I see the value 100123 in the FileUploadInterceptor inside the
ActionInvocation, but before I write stupid code, I'd like to see if there
might be a straightforward approach.

Peace,
Scott