Re: getting data from form with nested beans

[Mark Lowe]

Dunno what that thread on lazy lists was but nesting beans should work  
fine, but you will need to scope any property that you want a dynamic  
size to session.

Shouldn't be anymore complicated than that.

On 19 Jan 2004, at 16:01, Martin Sturzenegger wrote:

hi,
concerning nested properties, i found so many questions, hints etc. in  
the archive but nothing that really helped all the way...i'm still  
confused (or even more now...)
i still don't understand how struts handles input from a form that  
holds an iteration of nested beans.
is the following correct?
as soon as the user submits the form, the actionform-bean, holding the  
nested beans with the user's changes, gets transmitted.
is it so, that before the action-class is called, the form-bean's  
reset() method is called, and all nested beans are set to null by  
default?
so do i have to override the reset() method?
what do i iterate over in the reset() method to get the user's inputs?
how do i limit the iteration?
does the validate() method gets called before the reset method?.

i've seen examples, where a dto-class is instanciated within the  
reset() method.
is this the way to do it?
do i have to access these dto-beans in the action class?

could somebody give me a little example of a reset()-method, just to  
show how the user's input can be gathered and then stored away?

and.. what are lazy lists? i wasn't able to find a definition....

sorry about it but

regards from an utterly confused martin



---------- Urspruengliche Nachricht ------------------------------
Von: <[EMAIL PROTECTED]>
Datum:  Mon, 19 Jan 2004 10:52:10 +0100
You ahve a fixed length or Empty list in the form.So when the auto  
population tries to populate the nested bean for the list which is  
empty/fixed size,you get this exception.
Try to use lazy list or search the archive for nested property  
usage...There are many examples which will demonatrate how to use it.

HTH.
regards,
Shirish
-----Original Message-----
From: Martin Sturzenegger [mailto:[EMAIL PROTECTED]
Sent: Monday, January 19, 2004 10:46 AM
To: Struts Users Mailing List; [EMAIL PROTECTED]; Struts  
Users
Mailing List
Subject: Re: Including one JSP in another

i try to receive user-input from a form using a list of nested beans.
after hitting submit i get an ArrayIndexOutOfBoundsException
can somebody give me a hint?
many thanks
martin


stacktrace:

java.lang.ArrayIndexOutOfBoundsException
	java.lang.reflect.Array.get(Native Method)
	 
org.apache.commons.beanutils.PropertyUtils.getIndexedProperty(Property 
Utils.java:525)
	 
org.apache.commons.beanutils.PropertyUtils.getIndexedProperty(Property 
Utils.java:428)
	 
org.apache.commons.beanutils.PropertyUtils.getNestedProperty(PropertyU 
tils.java:770)
	 
org.apache.commons.beanutils.PropertyUtils.getProperty(PropertyUtils.j 
ava:801)
	org.apache.commons.beanutils.BeanUtils.setProperty(BeanUtils.java: 
881)
	org.apache.commons.beanutils.BeanUtils.populate(BeanUtils.java:808)
	org.apache.struts.util.RequestUtils.populate(RequestUtils.java:1252)
	 
org.apache.struts.action.RequestProcessor.processPopulate(RequestProce 
ssor.java:821)
	 
org.apache.struts.action.RequestProcessor.process(RequestProcessor.jav 
a:254)
	org.apache.struts.action.ActionServlet.process(ActionServlet.java: 
1482)
	org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:856)




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