Re: Parameters in include tag

James Strachan Thu, 29 Mar 2001 09:08:29 -0800

Hi Manuel

This one has bitten me more times than I like to remember. The quick answer is move to JSP 1.2 and it solves this problem - Tomcat 4.x supports JSP 1.2.

The more detailed answer is that in JSP 1.1 there is a problem using BodyTags which contain a <jsp:include> inside their body. In JSP 1.1 the output of <jsp:include> is meant to go straight to the HttpServletResponse so the BodyTag never sees the output - so even if your code would run without throwing an exception, the XML you are trying to style would go to the users browser and the <xsl:apply> tag wouldn't get any XML to style.

I hit this limitation all the time, here are my 2 workarounds - both are far less than ideal and will be removed as soon as I can develop on JSP 1.2...

1) use static includes

<xsl:apply xsl="xsl/restaurantstable.xsl">
<%@ include file="/something.jsp" %>

</xsl:apply>

In this model you can use scripting variables to communicate between the 2 bits of JSP

2) use a seperate HTTP request to call your 'include'.

if you had a tag library to perform a http request you could do something like this:-

<xsl:apply xsl="xsl/restaurantstable.xsl">
<io:http url="/servlet/Restaurants">

<io:param name="State" value="<%= stateCode %>"/>
</io:http>
</xsl:apply>

If you're stuck and need a tag library to do http requests as shown above, I posted an "io tag library" to the taglibs-dev list recently, though it hasn't been officially accepted yet, so use at your own risk. Mail me privately if you like and I can send you the the tag lib.

----- Original Message -----

From: Manuel Alzola

To: [EMAIL PROTECTED]

Sent: Thursday, March 29, 2001 9:41 PM

Subject: Re: Parameters in include tag

Thanks Pierre.

<jsp:include page="/servlet/Restaurants" flush="true">
    <jsp:param name="State" value="<%= stateCode %>"/>
</jsp:include>

works fine, but when I try to nest it in the following way

<xsl:apply xsl="xsl/restaurantstable.xsl">
    <jsp:include page="/servlet/Restaurants" flush="false">
        <jsp:param name="State" value="<%= stateCode %>"/>
    </jsp:include>
</xsl:apply>

I get the error

javax.servlet.ServletException: Illegal to flush within a custom tag

and if I turn off flush I receive

jsp:include page="..." flush="true" es la unica combinacion valida en JSP 1.0

the xsl tag I´m using is the one from jakarta and my server is Tomcat 3.2

Thanks

----- Original Message -----
From: "Pierre Delisle" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, March 29, 2001 3:51 AM
Subject: Re: Parameters in include tag

>
>
> > Manuel Alzola wrote:
> >
> > Hello. I´m using the include tag to put the output of a servlet into a jsp
> > page. It works fine but I also need to put some parameters in the request. Is
> > there a nested tag to let me do this? Is there any other way to accomplish it?
>
> You may use:
>
> <jsp:include page="urlSpec" flush="true">
>   { <jsp:param .... /> }*
> </jsp:include>
>
>     -- Pierre
>

Re: Parameters in include tag

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