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From Sandeep Takhar <sandeep_tak...@yahoo.com>
Subject Re: ActionForm mapped property submit/populate error
Date Mon, 07 Jul 2003 17:34:42 GMT
A very common problem and you can spend too much time
on these issues.

Personally - I would use the nested tags.

When using them - don't worry about generating the
nested property syntax.  Just use them intuitively in
the easiest fashion possible.  This includes mapped
properties.

For indexed properties you will need

Object getObject(int index)

and setObject(int index, Object o)

and for mapped properties you need

Map getMap(String key)
setMap(String key, Object value)

on the action forms.

then just use this for indexed:

<nested:iterate property="collection" id="someId">
  <nested:text property="name"/>
</nested:iterate>

This will populate and load from the name property of
the object that is in the collection.  The collection
is stored in an attribute called "collection" in some
scope (in the above example).

for mapped

<nested:iterate property="myFormsMap">
  <nested:property="name"/>
<nested:iterate>

This will load and populate the name property of
whatever object is in the map.

that's it - it is that easy.

Here is another reference:

http://www.mail-archive.com/struts-user@jakarta.apache.org/msg71256.html

sandeep
--- Nate Bowler <bowler@attask.com> wrote:
> I'm sure this is a common question for Struts
> newcomers dealing with 
> mapped and indexed properties, but I can't find a
> good solution.
> 
> To sum it up quickly, I can read values from an
> ActionForm with the 
> following syntax in a JSP tag "rows(1).val", but
> when I submit, I 
> get the following exception. Ideas?:
> 
> java.lang.IllegalArgumentException: No bean
> specified
> 	at 
>
org.apache.commons.beanutils.PropertyUtils.getPropertyDescriptor
> (PropertyUtils.java:837)
> 	at
> org.apache.commons.beanutils.BeanUtils.setProperty
> (BeanUtils.java:934)
> 	at org.apache.commons.beanutils.BeanUtils.populate
> (BeanUtils.java:808)
> 
> 
> Here are more details:
> 
> I've got an ActionForm subclass with the following
> methods:
> 
> public Map getMap();
> public void setMap(Map map);
> 
> public MyRow getRows(String idx);
> public void setRows(String idx, MyRow val);
> 
> I prepopulate the form in an "open" action and
> everything displays 
> beautifully. However, when I submit, the bean is
> "lost" and 
> 
> BeanUtils can't seem to "repopulate" it.
> 
> What am I missing here?
> 
> - The reset() method is implemented and it
> reinitializes everything.
> - It is a request scope form.
> 
> What is the "best practice" for this type of use
> case?
> 
> Nate
> 
>
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