Say for example we have a
<ww:checkboxlist
name="selectedOptions"
list="options"
listKey="id"
listValue="name" />
If we like to populate options upon validation failure, we could have a prepare interceptor above the validation interceptor in the interceptor stack.
....
public void prepare() throws Exception {
// populate the options property list with options
// that are supposed to be checked.
}
....