problem adding dynamically a new element to an ArrayList

[Kristof Camelbeke]

Hello I don't know if this is the correct forum since it's a jsp-struts-javascript issue...

Anyway here's the situation.

A page is loaded with a form which contains a List....

This list is iterated as follows:

	
<c:forEach var="electrode" items="${Form.alist }">  
        <c:set var="index" value="${index + 1 }" />
	<html:hidden name="electrode" property="company" styleId="${index }Value" indexed="true" />
	<html:hidden name="electrode" property="serialNumber" styleId="${index }Value" indexed="true" />
	<html:hidden name="electrode" property="remarks" styleId="{index }Value" indexed="true" />
</c:forEach>

The properties of this list are stored and passed via <html:hidden> properties to the javascript function where the html code is generated.
Here's an example of the generated html output for 1 property:

<input type="text" name="aList[1].serialNumber" size="20" id="txtSerialNumber2" title="Serienummer" class="textField" classname="textField" value="0002-00000-02"/>  

All works well when I submit the form without adding a new element

When the the user decides to create a new element the same javascript function is called to create the html code indexing the proper form elements.
When the submit is done I get an ArrayOutOfBoundsException at org.apache.commons.beanutils.PropertyUtilsBean.getIndexedProperty(PropertyUtilsBean.java:433)

So how do you increment the list size? I use the getXXX(index) in my form but it never gets there when the index is larger thant the list size.
I've seen many examples but most are for editing the current list not adding new elements...

Any input is mostly appreciated!

Thank you

[Bear Bibeault]

As this appears to be an issue populating a Struts form, I've moved it along to the Struts forum.

[Lorand Komaromi]

Are you using Struts 1..?

[Kristof Camelbeke]

We're still using 1.2.7...

[Bear Bibeault]

Is your bean set up properly to accept indexed properties? The rules are fairly stringent.

Here's something I found That might give you a wedge to start exploring...

[Kristof Camelbeke]

Thanks Bear for the link to the article.

I have a getXX(index) method which is called for the existing items but I have no setter and that might be the problem for the ArrayIndexOutOfBoundsException as mentionned in the article:

The indexed getter and setter methods may throw a java.lang.ArrayIndexOutOfBoundsException runtime exception if an index is used that is outside the current array bounds. In order to change the size of the array you must use the array setter method to set a new (or updated) array.

I'll try this first out thing monday morning...

[Seetharaman Venkatasamy]

Kristof Camelbeke wrote:
I'll try this first out thing monday morning...

why monday?.

[Kristof Camelbeke]

It's on my pc at work and since they don't give us laptops I don't have any other option than to wait till monday morning

[Kristof Camelbeke]

I've added the indexed setters/getters on my bean but they never get called... I even added them on the ActionForm but also no result....

here's the generated html output:

<input type="text" name="aDto.aList[2].serialNumber" size="20" id="txtSerialNumber3" title="Serienummer" class="textField" classname="textField"/> 

To resume my 'aDto' has a List 'aList' wich references Object items where serial number is a String property.
I've added indexed getter/setters in this dto for the list and for the properties of the Object items but they never get called.

When debugging I see that the public Object getIndexedProperty(Object bean, String name) method is called from the PropertyUtilsBean and that the line return (getIndexedProperty(bean, name, index)); contains the bean with index 2 and the index 3 which causes the ArrayOutOfBoundsExcption....

[Kristof Camelbeke]

Hello,

Anybody has an idea what the cause of this problem is?

Thanks...

[Tom Rispoli]

try posting the relevant declarations, getters, and setters for your beans. The problem is probably there somewhere.