Index problems in select multiple=true

[Jeremiah Armstrong]

I have a question concerning the way ActionForm processes the following:

<select name="serialNumbers[123]" multiple="true" size="5">
 <option value="serialNumber1">serialNumber1</option>
 <option value="serialNumber2">serialNumber2</option>
 <option value="serialNumber3">serialNumber3</option>
 <option value="serialNumber4">serialNumber4</option>
 <option value="serialNumber5">serialNumber5</option>
 <option value="serialNumber6">serialNumber6</option>
</select>

In my ActionForm, I've written the following setter method:

public void setSerialNumbers(int poDetailId, String[] serialNumbers) {
        for (int i = 0; i < serialNumbers.length; i++) {
                System.out.println("poDetailId = " + poDetailId);
                System.out.println("serialNumbers[i] = " + serialNumbers[i]);
        }
}

For some reason, I always get the following error when posting the form:

java.lang.IllegalArgumentException: argument type mismatch
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at 
org.apache.commons.beanutils.PropertyUtils.setIndexedProperty(PropertyUtils.java:1435)
        at org.apache.commons.beanutils.BeanUtils.setProperty(BeanUtils.java:1013)
        at org.apache.commons.beanutils.BeanUtils.populate(BeanUtils.java:808)
        at org.apache.struts.util.RequestUtils.populate(RequestUtils.java:1096)
        at 
org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:816)
        at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:254)
        at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1420)
        at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:520)


I've searched through the mail archives looking for answers on why this is happening 
and how to get around it, but I can't seem to find a straight answer. Does anyone have 
a simple solution or at least an explanation for why this syntax is incorrect?

Thanks!

-- Jeremiah Armstrong

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