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Message-ID: <39C12CA1.36ACDD79@eng.sun.com>
Date: Thu, 14 Sep 2000 12:53:05 -0700
From: Craig McClanahan <Craig.McClanahan@eng.sun.com>
Organization: Sun Microsystems, Inc.
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To: tomcat-user@jakarta.apache.org
Subject: Re: JSP exception question...help needed
References: <NEBBJLLJJKFIIJKBDOFDEEEMCEAA.valis@megapathdsl.net>
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Luis Andrei Cobo wrote:

> my impression is that HashMap doesnt have the signature of a bean, therefore
> I dont think it can be used as one.
>
> correct me if im wrong, but there are no empty contructors in hashMap (
> required for a java bean), and no set/get properties for bean scope
> variables.
>

It turns out that, if you create a HashMap object and store it (say, as a
request attribute) in a servlet and then forward to the JSP page, you won't
have any problems -- the attribute will already be there, so the JSP page will
not try to create it.

>
> Is there a particular reason why one would want to use HashMap as a bean
> anyhow?
>

In the Struts framework <http://jakarta.apache.org/struts> I have some custom
tags, among them one that knows how to iterate over various kinds of
Collections, Maps, and arrays.  In general, the Map interface exposes a "lookup
table" concept that can be quite useful.

>
> Perhaps construct a bean which overrides HashMap Properties and methods, and
> still contains a bean signature.
>
> Just curious
>
> Luis Andrei Cobo
>

Craig McClanahan