Java Development Tools

I am currently calling an applet inside a jsff page.

<jsp:plugin type="applet"
            code="TestApplet"
            codebase="http://localhost:8888/test/jars"
            name="applet" width="1" height="1"
            archive="test.jar, xerces-2.3.0.jar">
            <jsp:params>
                   <jsp:param name="param" value="${testManagedBean.param}"/>
            </jsp:params>
</jsp:plugin>

The code works just fine - What i need is to construct the codebase (http://localhost:8888/test/jars) programmatically using a managed bean the same way i've done with the jsp:param. The
problem is that when i type codebase="${testManagedBean.url}" the page doesn't compile:
The error says: "Static attribute must be a String literal, its illegal to specify an expression".
Does anybody know if there is any way to achieve this functionality (passing dynamic values in codebase)? Any suggestions would be much appreciated.

Cheers
George