Anonymous

package college.servlet;import java.io.IOException;import javax.servlet.RequestDispatcher;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * Servlet implementation class HelloServlet */@WebServlet("/HelloServlet")public class HelloServlet extends HttpServlet {	private static final long serialVersionUID = 1L;    /**     * Default constructor.      */    public HelloServlet() {        super();    	// TODO Auto-generated constructor stub    }	/**	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)	 */	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {		// TODO Auto-generated method stub7				String url = "/hello-world.jsp";				String username = request.getParameter("user");		if ((username==null) || (username.length()==0)) {			url = "/user-login.jsp";			request.setAttribute("error", "User must not be empty");					}				ServletContext context = this.getServletContext();		RequestDispatcher dispatcher = context.getRequestDispatcher(url);		dispatcher.forward(request, response);	}		}