Hello.

I have found problems using MD and PPP together, Struts2 complains (and errors are displayed in view) that no setter method was found because at first Params run, model is not yet instantiated. I am asking for which of the following approaches is the most recommended one:

1. Define a custom interceptor stack MPPP (ModelParamsPrepareParams), so model is instantiated before first params.

1.1. I have read [1] than moving ModelDriven would not be enough, but a MPPMP is required. Is this right?

2. [my preferred one] Define a (redundant) id property in the action and use it in the action and in the view instead of the id property of the model. I mean, instead of:

    @Override
    public void prepare() throws Exception {
        if (person.getId()  != null) {
            person = service.getPerson(person.getId());
        } else {
            person = new Person();
        }
    }

do

    @Override
    public void prepare() throws Exception {
        if (personId  != null) {
            person = service.getPerson(personId);
        } else {
            person = new Person();
        }
    }

doing the same in the view, using personId appropriately instead of (model) id.

3. Do not use ModelDriven.

Any other one? Is this issue documented?

Thanks.

[1] http://blog.mattsch.com/2011/04/14/things-discovered-in-struts-2/

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