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我尝试在表中插入一些信息，但得到这样的错误（NullPointerException）。也许它是空请求的原因，但我不确定。StandardWrapperValve [web.dbServlet]：Servlet.service（）用于servlet web.dbServlet抛出异常java.lang.NullPointerException
这里是一个日志，错误： enter image description here
第一个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");
}
问题出现在该Servlet的：
@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();
}
}