Brien Voorhees wrote:
> When a user object doesn't exist already in the session I want to forward
> the user to the login page. I'm trying to do this by putting the forward
> tag within the context of the useBean tag but it doesn't seem to work.
> Here's what is in the jsp :
>
> <jsp:useBean id="bapiContext" scope="session"
> class="proto.bapi.EmptyBapiContext" type="proto.bapi.BapiContext">
> <jsp:forward page="/login.jsp"/>
> </jsp:useBean>
>
Per the JSP spec, the thing you can put inside the <jsp:useBean> ... </jsp:useBean>
combination is <jsp:setProperty> elements. Even if the compiler generated the code
for the forward, it would probably generate an unconditional forward, rather than a
conditional one.
I solve this sort of problem by coding the equivalent scriptlet:
<%
proto.bapi.BapiContext bapiContext =
(proto.bapi.BapiContext) session.getValue("bapiContext");
if (bapiContext == null) {
%>
<jsp:forward page="/login.jsp"/>
<%
}
%>
In a JSP 1.1 environment (with custom tag libraries), it's also possible to create
a variation on the <jsp:useBean> element that has semantics like what you tried
here.
Craig McClanahan
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