List-backed properties

[Johann Uhrmann <jo...@xpecto.com>]

Hello all,

I am a little bit confused about an example for list-backed properties:

The documentation at 
http://jakarta.apache.org/struts/userGuide/building_controller.html
contains the following example in section 4.3.2:

public FooForm extends ActionForm {

     private final List values = new ArrayList();

     public void setValue(int key, Object value) {
         values.set(key, value);
     }

     public Object getValue(int key) {
         return values.get(key);
     }
}


As "values" is initialized as empty ArrayList, any call to values.set 
causes an IndexOutOfBoundException to be thrown.
(see also: 
http://java.sun.com/j2se/1.4.1/docs/api/java/util/ArrayList.html#set(int,java.lang.Object) 
  )

Therefore, I cannot imagine how that example could ever work.
Could someone please explain me that discrepancy?

Thanks in advance,

Hans


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