servlet登录页面：Debug Current Instruction Pointer

我写一个登录页面的servlet的时候出现这个断点调试指针，运行效果是点击登录没反应，求助各位大大：
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

 
try {
String username = request.getParameter("username"); //!!!!Debug Current Instruction Pointer
String password = request.getParameter("password");

UserDaoImpl udi= new UserDaoImpl();
for(int i=1;i<=5;i++){

UserInfo user = udi.getUserByLoginId(i);
System.out.println(user.getUsername());
if(username.equals(user.getUsername())&&password.equals(user.getPassword())){
HttpSession session = request.getSession(true);
user = new UserInfo();
user.setUsername(username);
user.setPassword(password);
session.setAttribute("user",user);
request.getRequestDispatcher("../main.html").forward(request,response);
break;
}else{
request.setAttribute("errMsg","登录失败！请重新登录");
}
}
}catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

user = new UserInfo();
 user.setUsername(username);
 user.setPassword(password);

你这段貌似没用哦

你这样做的话你存到session里面的user就是一个新 的用户了
你UserInfo user = udi.getUserByLoginId(i);
不是已经拿到值 了吗，直接放到session里面就行了

这个没有影响吧？UserInfo user = udi.getUserByLoginId(i)查询表里的字段，我删掉之后依然有断点