DataSource Servlet For Dynamic Drop Down

Hi,

I am using granite select resourceType to populate list of options. My servlet is written in a way which render different list based upon different parameter.

Below is the sample servlet

@SlingServlet(paths = "/api/bin/dropdown/vivek.json",
    selectors = {"abc","def"},
    extensions = ".html",
    methods = "GET")
public class AvailableThemeServlets extends SlingSafeMethodsServlet {
    private static final long serialVersionUID = 1668099305241096740L;
    @Override
    protected void doGet(SlingHttpServletRequest request,
                         SlingHttpServletResponse response) throws ServletException,
        IOException {
        /*String[] selector = request.getRequestPathInfo().getSelectors();
        for (String obj : selector) {
            System.out.println(obj);
        }*/
        List<Resource> themes = new ArrayList<Resource>();
        // set fallback
        ResourceResolver resolver = request.getResourceResolver();
        request.setAttribute(DataSource.class.getName(),
            EmptyDataSource.instance());
        ValueMap vm = null;
        for (int i = 0; i < 5; i++) {
            // allocate memory to the Map instance
            vm = new ValueMapDecorator(new HashMap<String, Object>());
            // Specify the value and text values
            String Value = "value" + i;
            String Text = "text" + i;
            // populate the map
            vm.put("value", Value);
            vm.put("text", Text);
            themes.add(new ValueMapResource(resolver, new ResourceMetadata(),
                "nt:unstructured", vm));
        }
        DataSource dataSource = new SimpleDataSource(themes.iterator());
        request.setAttribute(DataSource.class.getName(), dataSource);
    }
}

If I hit this servlet from browser say localhost:4502/api/bin/dropdown/vivek.json.abc.html , via debugging can see executions completes

If this servlet pass via datasource say /api/bin/dropdown/vivek.json.abc.html servlet doesn't execute.

If this servlet pass via datasource say /api/bin/dropdown/vivek.json servlet dynamic options displays in drop down [Expected Response]

Wondering why datasource doesn't working with selectors.

Regards