我尝试在表中插入一些信息,但是会出现这样的错误(NullPointerException)。也许它导致空的请求,但我不确定。
这是一个有错误的日志: enter image description here
First Servlet:
@WebServlet("/clientServlet")
public class clientServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
Client client = new Client();
client.setName(request.getParameter("name"));
client.setSurname(request.getParameter("surname"));
HttpSession session = request.getSession();
session.setAttribute(sessionKey.client, client);
response.sendRedirect("addTour.html");
}
第二个:
@WebServlet("/tourServlet")
public class tourServlet extends HttpServlet{
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
HttpSession session = request.getSession();
Tour tour = new Tour();
tour.setCountryTo(request.getParameter("countryTo"));
tour.setAmountOfDays(request.getParameter("amountOfDays"));
session.setAttribute(sessionKey.tour, tour);
response.sendRedirect("final.jsp");
}
此Servlet中出现问题:
@WebServlet("/dbServlet")
public class dbServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public dbServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
IRepositoryCatalog catalog = new RepositoryCatalog("jdbc:hsqldb:hsql://localhost/workdb");
HttpSession session = request.getSession();
Client client = (Client) session.getAttribute(sessionKey.client);
Tour tour = (Tour) session.getAttribute(sessionKey.tour);
catalog.Clients().add(client);
catalog.saveAndClose();
catalog.Tours().add(tour);
catalog.saveAndClose();
catalog.saveAndClose();
} catch (SQLException e) {
e.printStackTrace();
} catch (ClassNotFoundException a) {
a.printStackTrace();
}
}
答案 0 :(得分:0)
第一印象我可以说第一个和第二个servlet可能是一个POST方法所以做一个doGet并尝试'getParameter'你会得到一个空对象,所以抛出一个NullPointerException。你能发表一些关于你观点的文章吗?
(我会评论,但我还不能)