Mein Servlet-Code für ein Online-Formular-gestütztes Buchungssystem mit Java, JSP und MySQL wirft fortwährend eine NumberFormatException auf die Zeile beginnend bei 'int customer'. Abgesehen von hier ist nichts anderes mit meinem Code verkehrt.Servlet-Code, der NumberFormatException verursacht
java.lang.NumberFormatException: Für Eingabestring: "null"
Wenn ich für null oder leere Zeichenfolgen überprüfen alles, was ich Fehler bekommen.
if (submit.equals("add booking")) {
int customerID = Integer.parseInt(request.getParameter("customerID").trim());
int routeID = Integer.parseInt(request.getParameter("routeID").trim());
String sailing = request.getParameter("sailing").trim();
int noAdults = Integer.parseInt(request.getParameter("noAdults").trim());
int noChildren = Integer.parseInt(request.getParameter("noChildren").trim());
String otherinfo = request.getParameter("otherinfo").trim();
if (sailing.equalsIgnoreCase("")) {
url = "/scotiavalidation.jsp";
} else {
bookingManager.addBooking(customerID, routeID, sailing, noAdults, noChildren, otherinfo);
int bookingID = 0;
bookingID = bookingManager.getBookingIdByAdd(bookingID);
request.setAttribute("bookingID", bookingID);
url = "/bookingConfirmation.jsp";
}
Ich weiß, ich brauche einen Versuch catch Block irgendwo, aber ich kann es nicht herausfinden. Kann jemand eine Lösung vorschlagen? My Glassfish 4.1.1 Ausgabe sieht wie folgt aus:
Warning: StandardWrapperValve[BookingServlet]: Servlet.service() for servlet BookingServlet threw exceptionjava.lang.NumberFormatException: For input string: "null"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:580)
at java.lang.Integer.parseInt(Integer.java:615)
at controller.BookingServlet.processRequest(BookingServlet.java:46)
at controller.BookingServlet.doGet(BookingServlet.java:161)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:416)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:283)
at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:206)
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180)
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)
at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:283)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:200)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:132)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:111)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:536)
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:591)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:571)
at java.lang.Thread.run(Thread.java:745)
ich Sitzungen in Meine JSP-Seiten verwenden. Hier ist ein Fragment: