[Struts-user] Null collections

<logic:notEmpty name="myList">
<table ...>
...
<logic:iterate id="item" name="myList" type="java.lang.String">
...
</logic:iterate>
...
</table>
</logic:notEmpty>

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logic:notEmpty is the correct answer

Paul
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"None None" <fzammett@hotmail.com>
11/05/2004 18:03
Please respond to "Struts Users Mailing List"


To: user@struts.apache.org
cc:
Subject: Null collections


Hi folks... this should be a simple one, but I've been reading for about
30
minutes now without finding the answer...

I have a collection that I iterate over with logic:iterate, building a
table... normal stuff... problem is, the collection might be null, which
the
tag handles just fine, except that since I start my table OUTSIDE the
logic:iterate tag, I have a black square on the screen, the outline of the

table.

So, my question simply is what tag can I use, and with what syntax, to
check
if a collection in a bean is null before starting my logic:iterate tag? I

of course found logic:equal. but it doesn't seem like it would do what I
want. logic:notEmpty or maybe logic:notPresent might be the ticket, but
I'm
not sure how to set up the tag if one of them is the answer.

Thanks all!

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Wow, it really is that easy, isn't it?!? :) The only problem is that, as I
understand it, this will check if the myList BEAN is present, I actually
need to see if a given property of a bean is null. I answered that part
myself though... there's a property attribute, just like logic:iterate, and
now it does what I wanted. Thanks very much!

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Woops I just reread your message and noticed that I missed that part. But you
found it, so nice job.

Have fun strusting
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The JSTL <c:if...> tag will do it:

<c:if test="${!empty bean.collection}}">
generate table
</c:if?

You know, it's kinda funny you mention it but the past few days I actually
HAVE been having fun learning Struts! After havng my head in the clouds
architecting large systems and having to do so based on homegrown framework
solutions that are less than optimal (and that's being very polite!), Struts
is a joy to play with and get my hands firty with.
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