Using session bean created by JSF from a JSP

Question

So I'm creating and managing a bean using a JSF. The JSF then links to a JSP page that I need access to the managed bean. The JSF code:

<h:inputText id="firstName" value="#{registration.lastName}"/> <h:commandButton value="Register" action="confirm.jsp"/>

The JSP:

<jsp:useBean id = "registration" scope = "session" class = "Project1.Registration"> </jsp:useBean> <%= registration.getFirstName() %>

So, the JSP firstName is null. Can you use 'usebean' to get access to the JSF bean? Is there more I need to do to call the JSP and pass the managed bean? Obviously this is for a class and I wouldn't see a reason to mix the two like this, but alas that is the requirement. Any help is appreciated.

Community · Accepted Answer · 2020-06-20 09:12:55Z

There are 2 mistakes:

You do not need <jsp:useBean> if bean is already been created by some controller beforehand (such as JSF or even a plain vanilla servlet). Just directly access it by its name. It's as being a session scoped bean just available as a session attribute the usual EL way by ${registration}.
Neither <jsp:useBean> nor EL variables are as direct variables available in scriptlet <% ... %> scope. Instead, just use EL the usual way. Even more, scriptlets are strongly discouraged since more than a decade. You should stop using them and configure your web.xml to disable them.

So, all in all just this should do:

<c:out value="${registration.firstName}" />

The <c:out> is technically not mandatory, you can also just use ${registration.firstName}, but in contrary to Facelets, legacy JSP doesn't have implicit HTML escaping. So using <c:out> is functionally mandatory in order to prevent XSS attack holes which can occur during redisplaying unsanitized user-controlled input inline in HTML output.

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