Sling Default Servlet problem with DAM and siteadmin

Hi,

I have created a Sling Default Servlet to search Assets in DAM. I have used these OSGI DS Annotations:

@Component(service=Servlet.class,
property={
        Constants.SERVICE_DESCRIPTION + "= Servlet to search for assets in a specified location in DAM.",
        "sling.servlet.methods=" + HttpConstants.METHOD_GET,
        "sling.servlet.resourceTypes="+ "sling/servlet/default",
        "sling.servlet.selector="+ "findasset",
        "sling.servlet.extensions=" + "json"
})

The servlet is working fine and i am able to fetch the data. But the problem is that I am not able to  access siteadmin (http://localhost:4502/siteadmin ) and I am also not able to upload or edit any asset in the DAM (http://localhost:4502/assets.html/content/dam ).

Somebody please help me out in solving this  problem.