accessing context-param from jsp

harryos · Dec 5, 2008

hi
in my jsp page I want to access a parameter value given in web.xml

<html>
<jsp:include page="<%=application.getInitParameter("external-include")
%>"/>
<body>
....
</body>
</html>

where web.xml has
<context-param>
<param-name>external-include</param-name>
<param-value>WEB-INF/jspf/header_tag.jsp</param-value>
</context-param>

When i run the jsp page in tomcat i get an error >>
/includebyparam.jsp(6,22) Attribute value application.getInitParameter
("external-include") is quoted with " which must be escaped when used
within the value.

Is there something wrong with the way i coded it? Can someone help me
correct it
thanks
harry

harryos · Dec 5, 2008

<jsp:include page="<%=application.getInitParameter("external-include")
%>"/>

Attribute value application.getInitParameter

("external-include") is quoted with " which must be escaped when

Is there something wrong with the way i coded it? Can someone

to answer myown question ,the error doesn't happen when the code is
written this way

<% String headerpagename=application.getInitParameter("external-
include"); %>
<jsp:include page="<%=headerpagename%>" />

harry

Tim Slattery · Dec 5, 2008

harryos said:
Attribute value application.getInitParameter

to answer myown question ,the error doesn't happen when the code is
written this way

<% String headerpagename=application.getInitParameter("external-
include"); %>
<jsp:include page="<%=headerpagename%>" />

Look at the way to coded it first. You've got a quoted string within a
quoted string, and you're using double quotes (") to delimit both
strings. So the parser sees the second set of double quotes, which you
intend to start the inner string, as the end of a quoted string. I'm
not sure what the solution to that is, you might use single quotes for
the inner string, or maybe you have to escape the double quotes (\" or
something like that). And you found a way around it by eliminating
nested strings.

Lew · Dec 5, 2008

Use single quotes to set off the attribute, but really, scriptlet in your JSP?
Shame!

Attribute value application.getInitParameter

("external-include") is quoted with " which must be escaped when

Is there something wrong with the way i [sic] coded it? Can someone

Click to expand...

to answer myown question ,the error doesn't happen when the code is
written this way

<% String headerpagename=application.getInitParameter("external-
include"); %>

Even worse. Move all non-presentation logic into .java source and out of your
JSP. Learn JSTL. Study MVC.

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accessing context-param from jsp

harryos

harryos

Tim Slattery

Lew

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