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From John Cavacas <>
Subject RE: Recursion with JSTL tags
Date Fri, 02 May 2003 20:59:27 GMT

I'm still going at it, I got it to successfully do one include inside a
<forEach>, but the calling itself part actually crashes my container :)

Looks something like this:

<x:forEach select="$doc/categories/*" var="cats>
	.. parse some xml
	.. output some content
	<c:set var="kids">
		<x:out select="$cats/@haschildren"/>
	<c:if test="${kids == 'true'}">
		<c:import url="recursive.jsp"/>

In recursive.jsp I have something similar, except the import is itself
instead of another JSP.

<x:forEach select="$doc/categories/category[@parent=$catId]" var="subcat">

	... do some work
	<c:if test="${kids == 'true'}">
		<c:import url="recursive.jsp"/>

That's where my container (WebSphere) just craps out and crashes.

I have a feeling it may have to do something with output buffering, but I
don't think so if the first case works fine.


> -----Original Message-----
> From: Serge Knystautas []
> Sent: Friday, May 02, 2003 4:44 PM
> To: Tag Libraries Users List
> Subject: Re: Recursion with JSTL tags
> John Cavacas wrote:
> > Hi,
> >
> > This may seem like a silly question, but I was wondering if there was a
> way
> > to achieve recursive behavior out of the core and xml tags.
> JSTL prevents this in the sense that everything has to be an XML tag...
> there's no go to or self-referencing, so loops start and end.
> I think you're on the right track with having a include of yourself.  I
> vaguely remember that according to comp sci theory you can write
> recursive logic without being recursive, but how you do that has long
> since left my brain.
> --
> Serge Knystautas
> President
> Lokitech >> software . strategy . design >>
> p. 301.656.5501
> e.
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