HO un problema con una servlet ,che ho copiato da un corso , però non funziona ecco la jsp:
e la servletcodice:<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ page import="java.util.Date" %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Data odierna</title> </head> <body> <% Date data= new Date(); %> <h1>La data di oggi è : <%=data.toLocaleString() %></h1> <form action="HelloRequest" method ="post"> Nome: <input type="text" name="nome"></br> Cognome: <input type="text" name="nome"></br> <input type="submit" value="invia"> </form> </body> </body> </html>
La jsp funziona ma quando inserisco i dati e clicco su invia ho:codice:package Esempio; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * Servlet implementation class HelloRequest */ @WebServlet("/HelloRequest") public class HelloRequest extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public HelloRequest() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request,response); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=UTF-8"); PrintWriter out=response.getWriter(); String nome =request.getParameter("nome").toString(); String cognome =request.getParameter("cognome").toString(); out.println("<html>"); out.println("<head>"); out.println("<title>Primo esempio Servlet"); out.println("</title>"); out.println("<body>"); out.println("Benvenuto "+nome+" "+cognome+""); out.println("</body>"); out.println("</html>"); } }
codice:mag 11, 2013 7:33:20 PM org.apache.catalina.core.AprLifecycleListener init INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: /usr/java/packages/lib/amd64:/usr/lib/jni:/lib:/usr/lib mag 11, 2013 7:33:20 PM org.apache.tomcat.util.digester.SetPropertiesRule begin WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:Sito' did not find a matching property. mag 11, 2013 7:33:20 PM org.apache.tomcat.util.digester.SetPropertiesRule begin WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:Web1' did not find a matching property. mag 11, 2013 7:33:20 PM org.apache.tomcat.util.digester.SetPropertiesRule begin WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:CorsoDoc' did not find a matching property. mag 11, 2013 7:33:20 PM org.apache.coyote.AbstractProtocol init INFO: Initializing ProtocolHandler ["http-bio-8081"] mag 11, 2013 7:33:20 PM org.apache.coyote.AbstractProtocol init INFO: Initializing ProtocolHandler ["ajp-bio-8009"] mag 11, 2013 7:33:20 PM org.apache.catalina.startup.Catalina load INFO: Initialization processed in 1459 ms mag 11, 2013 7:33:20 PM org.apache.catalina.core.StandardService startInternal INFO: Starting service Catalina mag 11, 2013 7:33:20 PM org.apache.catalina.core.StandardEngine startInternal INFO: Starting Servlet Engine: Apache Tomcat/7.0.39 mag 11, 2013 7:33:25 PM org.apache.coyote.AbstractProtocol start INFO: Starting ProtocolHandler ["http-bio-8081"] mag 11, 2013 7:33:25 PM org.apache.coyote.AbstractProtocol start INFO: Starting ProtocolHandler ["ajp-bio-8009"] mag 11, 2013 7:33:25 PM org.apache.catalina.startup.Catalina start INFO: Server startup in 4469 ms mag 11, 2013 7:33:36 PM org.apache.catalina.core.StandardWrapperValve invoke SEVERE: Servlet.service() for servlet [Esempio.HelloRequest] in context with path [/CorsoDoc] threw exception java.lang.NullPointerException at Esempio.HelloRequest.doPost(HelloRequest.java:41) at javax.servlet.http.HttpServlet.service(HttpServlet.java:647) at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:947) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1009) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:722)
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