servlet出现500错误，在线等，挺急的

package myservlet.control;
import mybean.data.Login;
import java.util.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class HandleDelete extends HttpServlet {
public void init(ServletConfig config) throws ServletException {
super.init(config);
}
public void doPost(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException {
request.setCharacterEncoding("utf-8");
String delete = request.getParameter("delete");
Login loginBean=null;
HttpSession session=request.getSession(true);
try{ loginBean=(Login)session.getAttribute("loginBean");
boolean b =loginBean.getLogname()==null||
loginBean.getLogname().length()==0;
if(b)
response.sendRedirect("login.jsp");//重定向到登录页面g
LinkedList<String> car = loginBean.getCar();
car.remove(delete);
}
catch(Exception exp){
response.sendRedirect("login.jsp");//重定向到登录页面
}
RequestDispatcher dispatcher=
request.getRequestDispatcher("lookShoppingCar.jsp");
dispatcher.forward(request, response);//转发
}
public void doGet(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException {
doPost(request,response);
}
}

不要沉啊……