AJAX with JSON, dojo rpc (smd)

[Ercan Kayaonu]

Hi all,
I have an Action class which has basic CRUD methods in it. I'm using
convention plugin. I want to ajax-call list, save, and delete methods using
dojo rpc. (I included my UsersAction class below).
I did these kind of things in php, but it is, at least for now, very
difficult for me to understand struts way.

What i understood from
http://cwiki.apache.org/S2PLUGINS/json-plugin.html
documentation is first, I have to annotate these functions (list, delete,
save) as @SMDMethod.
2- Specify mappings. Here i have 3 problems. The example given on that page
is:
<s:url id="*smdUrl*" namespace="/nodecorate" action="SMDAction" />  (in my
case SMDAction is UsersAction)
<script type="text/javascript">
//load dojo RPC
dojo.require("dojo.rpc.*");

var service = new dojo.rpc.JsonService("${*smdUrl*}");

---------------------------

a) Can I extend the first line as <s:url id="smdUrl" namespace="/nodecorate"
action="SMDAction" *method="list"*/> (save ,delete also) and NOT define any
interceptors?
b) If I have to define interceptors is it gonna be something like this
@InterceptorRefs({
   @InterceptorRef("list"),
   @InterceptorRef("save")
   @InterceptorRef("delete")
})  on the class.

c) Doc says: Add the map inside a package that extends
"json-default"<package name="example" extends="
*json-default*">
<action name="JSONExample" class="example.JSONExample">
<result type="json"/>
</action>
</package>

Do i need this extends parameter? If so, how can i use it with convention
plugin?

One more thing: Which libs do i need: Just jsonplugin-0.32.jar* *and
struts2-dojo-plugin-2.1.5.jar. What is the purpose of json-lib-2.1.jar?
This is my UsersAction class:

public class UsersAction extends ActionSupport {
    private List<User> users;
    private UserService service;

    @Action(value="/admin/users", result...@result(name="success",
type="redirect", location="/admin/users/list")})
    public String execute() {
        service = new UserService();
        return SUCCESS;
    }

    @Action(value="/admin/users/list", result...@result(name="success",
type="tiles", location="admin.users")})
    public String list() {
        users = service.findUserEntities();
        return SUCCESS;
    }

   public String save() {............}
   public String delete() {............}
}

Thanks for your help in advance.