DynaValidatorActionForm and java.util.ArrayList

hello all...
How can i use ArrayList property in DynaValidatorAtionForm?
<p>
I've a combo box , where multiple selection is allowed... say customers. I want to store those selected values to a ArrayList which is defined in struts-config.xml
I'm using this....

<html:select property="customers" multiple="true" size="3">
<html

ptions collection="usersBean" property="users"/>
</html:select>

(usersBean is java bean , where i've the list of customers to populate)
and 'customers' is a proeprty in DynaValidatorActionForm.

<form-property name= "customers" type= "java.util.ArrayList"/>

when I add this property to my struts-config.xml , application is throwing exception...
<b>
SEVERE: Error creating form bean of class org.apache.struts.validator.DynaValidatorActionForm
java.lang.IllegalArgumentException: Invalid property name 'customers'
</b>
I'm not able to figure out the cause...
what could be the problem?

or any other way to accomlish this task??

Thanks in advance

Extension to the above.....
getting an exception Cannot create Iterator for CustomerBean

wat could be the cause??

When you allow multiple values in an <html:select> tag, struts does not support using an ArrayList or any other collection to hold the value. You must use type java.lang.String[]. Otherwise, you will get this error when Struts tries to poplulate the form bean.

I've tried with property String[].
but getting the same exception Cannot create iterator for Customers .
is this exception really related to bean populaion?
becoz we have exclusice exception for that... beanUtils.populate exception.

sorry.The exact exception is... Cannot create iterator for usersBean@a2bd15 . i was cinfused in bean names.
I've a basic doubt here... this html ption collection is supported by which version of struts?
and moreover saving it to dynaform using String[] is possible??
do i need any specail jar file to accomlish this?

The <html

ptions> tag is supported by all versions of Struts.

It appears you may have used it incorrectly. See This link for instructions on how to use it.

If users is a property in usersBean that contains a collection of Strings that are to be used as the options, the proper usage of the tag would be:

<options name="userBean" property="users" />

If the users property contains a collection of ojbects (for example, a User object with a name and id property) Then you must specify which property is to be used for the value and which for the label. In this case, the <html

ptionsCollection> tag is more appropriate. It would look something like this:

<html

ptionsCollection name="userBean" property="users" label="name" value="id" />

Thanks for the link. I've read this earlier but couldn't get any clue.
Here is my code :

The <html

ptions> tag is still coded incorrectly.

Given what you have shown me of your bean, the correct entry should be:

<html

ptions name="usersBean" property="users" />

P.S. It is against standard java practice to begin a class name with a lower case character. I'd suggest you change the usersBean class name to UsersBean.
[ April 18, 2006: Message edited by: Merrill Higginson ]

Thanks for the help.
I've left that <html

ptions collection > tag and used
<html

ptions name>
it's working fine. Though i'm getting Conversion Exception after submit, I think i can handle that.
And... the Naming convention for java class is my mistake.
anywyas...thanks