Binding form input to an ArrayList

[rappa]

Hi,

I'm using the following Spring convention to bind my input values to an ArrayList:

<input type="text" name="moves[0].zipInfo.zip" value="">

Actually the JSP looks like:

<input type="text" name="moves[<c:out value="${command.currentMove}"/>].zipInfo.zip" value="<c:out value="${command.moves[command.currentMove].zipInfo.zip}"/>">

Where command.currentMove represents the List index

It works great for the most part. The problem occurs if the user creates a new session, uses the back button to return to this page, and submits the form. Doing so results in the following error:

org.springframework.beans.InvalidPropertyException : Invalid property 'moves[0]' of bean class [FormBean]:..

This makes sense since the moves list is now empty. I avoid this situation in normal processing by creating a Move object at the currentMove prior to this page.

I thought about a couple solutions:

1. return user to start page in error handler if InvalidPropertyException is caught.

2. binding form input to String and adding to List in the onBind method.

3. Adding a new Move object to list at the correct index during the bind process.

Possibly I am over complicating this - any ideas would be appreciated.