final ServletContextHandler servletHandler = new ServletContextHandler(ServletContextHandler.SESSIONS);

final String servletWebDir = "/";
servletHandler.setContextPath( servletWebDir );

final customServlet iass = new customServlet();

final ServletHolder servletHolder = new ServletHolder( iass );
servletHolder.setInitOrder(0);
servletHandler.addServlet( servletHolder, "/customServlet" );

final ResourceHandler resourceHandler = new ResourceHandler();
resourceHandler.setDirectoriesListed(false);
resourceHandler.setResourceBase(".");

final HandlerList handlers = new HandlerList();
handlers.setHandlers(new Handler[]{ servletHandler, resourceHandler } );

server.setHandler( handlers );