Jdeveloper And Jsp Include Files

the problem is that JDev does not know the following things:

Variables (bean define) that are introduced in JSPs which are incuding other JSPs. Within the included JSPs these variables are not known by jdev

per example
I have a variable (String class) defined in good.jsp and then include sub.jsp which tries to access this variable:

<% String tester = "This is a test string."; %>
<%@ include file="sub.jsp" %>

where sub.jsp has something that looks like:

<%=tester%>

According to everything I have read, since sub.jsp is simply being included in good.jsp at translation time, it should be able to see that variable tester and to access it as well. But when I try to compile I get error
is there are any way to workaround this
thanks