Hallo,
I struggled with the same problem for many days and found finally a workaround. Arron pointed me to a much better workaround for the problem.
I compiled a tutorial explaining the background and possible workarounds.
The tutorial is on my website
http://www.laliluna.de/tutorial/struts-dynamic-forms/struts-dynamic-forms-tutorial.html
You will find the problem quite offen related to
*java.lang.IndexOutOfBoundsException* when using at org.apache.commons.beanutils.BeanUtils.populate
or *java.lang.ArrayIndexOutOfBoundsException*
dynamic forms
Regards Sebastian
Antony Paul wrote:
Thanks for the reply. I scraped the original code and replaced it with my own implementation using Map. I will experiment your suggestions in the next opportunity.
rgds Antony Paul
----- Original Message ----- From: "Matt Bathje" <[EMAIL PROTECTED]> To: "Struts Users Mailing List" <[EMAIL PROTECTED]> Sent: Tuesday, September 14, 2004 7:14 PM Subject: Re: Need example of using DynaActionForm with ArrayList (1.1)
Antony Paul wrote:use
Hi all,
Sorry if it is a repost.
Using Struts 1.1.
I have an ActionForm in which displays an array of items. I want to
ableDynaValidatorForm here which uses ArrayList as property holders. I am
beto pre-populate the form. I have trouble in displaying the values and on
submission nothing is populated. If somebody can give an example it will
name="org.apache.struts.taglib.html.BEAN[0].productdesc"very useful to me.
Struts-config.xml ------------------ <form-bean name="PriceForm" type="org.apache.struts.validator.DynaValidatorForm"> <form-property name="productid" type="java.util.ArrayList"/> <form-property name="productdesc" type="java.util.ArrayList"/> </form-bean>
JSP --- logic:iterate name="PriceForm" property="productid" id="pid" indexId="index"> <tr> <//html:hidden property='<%="productid["+index+"]"%>'/> <td><html:text property="productdesc" indexed="true"/>
<td><//html:text property='<%="productdesc["+index+"]"%>'/>
</tr> </logic:iterate>
I tried using indexed attribute. Then HTML generated is
<input type="text"
value="[product desc 0]">
See the value is in braces.
If I use <html:text property="productdesc" indexed="true"/> I get
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
What is wrong ?.
rgds
Antony Paul
Antony - I've never done this with an arraylist myself, just arrays - but in my experience the error you are getting comes up when struts can't figure out the length of the collection you are trying to iterate over. This usually happens when the form is being put in the request scope and not in the session scope.
Is it possible you could post the relevant portions of your "loader" class, as well as the action mappings for the loader and submit forms?
The other alternative you may have is to look into using Niall's LazyList implementation. It is supposed to get rid of a lot of headache's like that. (Just google for struts lazylist and you'll see what you need.)
Matt
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