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Ich habe an einfachen Banking-Projekt gearbeitet und ich bin in der Anfangsphase. Was ich möchte, ist die Kundeninformationen in der Datenbank speichern über Register.html und RegisterServlet.java Seiten. Aber es hat leider aufgehört, mit einem Fehler zu funktionieren. StatdardWrapperValve-Aufruffehler (NullPointerException). Ich habe versucht, dieses Problem von den letzten 3 Tagen zu lösen, aber keine Lösung. Ich schließe auch meinen GitHub Link ein GitHub Jdbc Banking Project Link und in Jar-Datei habe ich nur ojdbc6 enthalten. Mein Code bricht ein try Block Zeile (ps = con.prepareStatement ("Einfügen in Kunden (Name, E-Mail, Handy, Stadt, dob) Werte (?,?,?,?,?)");) Ich brauche einige ernst Hilfe.org.apache.catalina.core.StandardWrapperValve aufrufen SEVERE: Servlet.service() für Servlet
My pages
1. login.html
2. register.html
3. RegisterServlet.java
4. DBConnectionManager.java
5. web.xml
register.html
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h3 align="center">Customer Registration Page</h3>
<form action="RegisterServletPath" method="post">
<table align="center">
<tr>
<td>Customer Name</td>
<td><input type="text" name="name"></td>
</tr>
<tr>
<td>Email</td>
<td><input type="text" name="email"></td>
</tr>
<tr>
<td>Mobile</td>
<td><input type="text" name="mobile"></td>
</tr>
<tr>
<td>City</td>
<td><input type="text" name="city"></td>
</tr>
<tr>
<td>DOB</td>
<td><input type="date" name="dob"></td>
</tr>
<tr>
<td></td>
<td><input type="submit" value="Register"></td>
</tr>
</table>
</form>
</body>
</html>
RegisterServlet.java
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import javax.servlet.RequestDispatcher;
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 RegisterServlet
*/
//@WebServlet("/RegisterServletPath")
@WebServlet(name="RegisterServlet", urlPatterns={"/RegisterServletPath"})
public class RegisterServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.getWriter().append("Served at: ").append(request.getContextPath());
System.out.println("Inide doGet method");
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("Inside doPost method");
PrintWriter out = response.getWriter();
out.print("<html><h3>It is coming from RegisterServlet.java</h3></html>");
String name = request.getParameter("name");
String email = request.getParameter("email");
String mobile = request.getParameter("mobile");
String city = request.getParameter("city");
String dob = request.getParameter("dob");
/*write the logic for input validation*/
String errorMsg = null;
if(name == null || name.equals("")) {
errorMsg = "Name can't be empty";
}
if(email == null || email.equals("")) {
errorMsg = "Email can't be empty";
}
if(mobile == null || mobile.equals("")) {
errorMsg = "Mobile number can't be empty";
}
if(city == null || city.equals("")) {
errorMsg = "City name can't be empty";
}
if(dob == null || dob.equals("")) {
errorMsg = "Date of birth can't be empty";
}
System.out.println("Line 64");
//when the text field is not null, this code statement won't run
if(errorMsg != null) {
System.out.println("Line 67");
RequestDispatcher rd = getServletContext().getRequestDispatcher("/register.html");
PrintWriter out1 = response.getWriter();
out1.println("<font color=red>" +errorMsg+"</font>");
rd.include(request, response);
}
// System.out.println("Line 73");
else {
System.out.println("Line 73");
Connection con = (Connection)getServletContext().getAttribute("DBConnection");
PreparedStatement ps = null;
System.out.println("Line 79");
try{
System.out.println("Line 81");
ps = con.prepareStatement("insert into customers(name,email,mobile,city,dob) values (?,?,?,?,?)");
System.out.println("Line 82");
ps.setString(1, name);
ps.setString(2, email);
ps.setString(3, mobile);
ps.setString(4, city);
ps.setString(5, dob);
System.out.println("Line 87");
ps.execute();
//forward to login page to login
RequestDispatcher rd = getServletContext().getRequestDispatcher("/login.html");
PrintWriter out1 = response.getWriter();
out1.println("<font color=green>Registration Successful, please login.</font>");
rd.include(request, response);
}
catch(SQLException e) {
e.printStackTrace();
//logger.error("Database connection problem");
throw new ServletException("DB Connection Problem");
}
finally {
try {
ps.close();
}
catch(SQLException e) {
System.out.println("Inside second catch block");
//logger.error("SQLException is closing PreparedStatement");
}
}
}
//doGet(request, response);
}
}
DBConnectionManager.java
package com.banking.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
/*
* DBConnectionManager.java is a utility class for Oracle11g database connection and it has a method that
* returns connection object. We will use this class for database connection and then set the connection
* to servlet context attribute(web.xml) that other servlets can use.
* */
public class DBConnectionManager {
private Connection connection;
public DBConnectionManager(String dbURL, String username, String password) throws
ClassNotFoundException, SQLException {
Class.forName("oracle.jdbc.driver.OracleDriver");
this.connection = DriverManager.getConnection(dbURL,username,password);
}
public Connection getConnection() {
return this.connection;
}
}
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>JDBC Banking Project</display-name>
<welcome-file-list>
<welcome-file>register.html</welcome-file>
</welcome-file-list>
<context-param>
<param-name>username</param-name>
<param-value>system</param-value>
</context-param>
<context-param>
<param-name>password</param-name>
<param-value>123456</param-value>
</context-param>
<context-param>
<param-name>dbURL</param-name>
<param-value>jdbc:oracle:thin:@localhost:1521:xe</param-value>
</context-param>
</web-app>
Fehlerkonsole
May 03, 2017 1:02:28 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:Hello World' did not find a matching property.
May 03, 2017 1:02:28 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:JDBC Banking Project' did not find a matching property.
May 03, 2017 1:02:28 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Server version: Apache Tomcat/7.0.69
May 03, 2017 1:02:28 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Server built: Apr 11 2016 07:57:09 UTC
May 03, 2017 1:02:28 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Server number: 7.0.69.0
May 03, 2017 1:02:28 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: OS Name: Windows 8.1
May 03, 2017 1:02:28 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: OS Version: 6.3
May 03, 2017 1:02:28 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Architecture: amd64
May 03, 2017 1:02:28 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Java Home: C:\Program Files\Java\jre7
May 03, 2017 1:02:28 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: JVM Version: 1.7.0_79-b15
May 03, 2017 1:02:28 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: JVM Vendor: Oracle Corporation
May 03, 2017 1:02:28 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: CATALINA_BASE: D:\Eclipse Workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0
May 03, 2017 1:02:28 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: CATALINA_HOME: C:\Program Files\Apache Software Foundation\Tomcat 7.0
May 03, 2017 1:02:28 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dcatalina.base=D:\Eclipse Workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0
May 03, 2017 1:02:28 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dcatalina.home=C:\Program Files\Apache Software Foundation\Tomcat 7.0
May 03, 2017 1:02:28 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dwtp.deploy=D:\Eclipse Workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps
May 03, 2017 1:02:28 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Djava.endorsed.dirs=C:\Program Files\Apache Software Foundation\Tomcat 7.0\endorsed
May 03, 2017 1:02:28 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dfile.encoding=Cp1252
May 03, 2017 1:02:28 PM org.apache.catalina.core.AprLifecycleListener lifecycleEvent
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jre7\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;D:\app\Shital\product\11.2.0\dbhome_1\bin;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Intel\OpenCL SDK\2.0\bin\x86;C:\Program Files (x86)\Intel\OpenCL SDK\2.0\bin\x64;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Program Files (x86)\QuickTime Alternative\QTSystem;C:\Program Files\Java\jdk1.7.0_79\bin;C:\Program Files\Java\jdk1.7.0_79\jre\lib;.
May 03, 2017 1:02:29 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
May 03, 2017 1:02:29 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
May 03, 2017 1:02:29 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 924 ms
May 03, 2017 1:02:29 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
May 03, 2017 1:02:29 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.69
May 03, 2017 1:02:29 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8080"]
May 03, 2017 1:02:29 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
May 03, 2017 1:02:29 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 907 ms
Inside doPost method
Line 64
Line 67
Inside doPost method
Line 64
Line 73
Line 79
Line 81
May 03, 2017 1:03:03 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [RegisterServlet] in context with path [/JDBC_Banking_Project] threw exception
java.lang.NullPointerException at RegisterServlet.doPost(RegisterServlet.java:110)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:436)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
Hey, ich verweise diesen Blog-Beitrag [http://www.journaldev.com/1997/servlet-jdbc-database-connection-example], aber nicht alle Dateien erstellen. Ich wollte nur die ersten grundlegenden Schritte machen. Wirst du bitte in den obigen Link schauen und mir helfen mit dem, was mir fehlt. Ich habe meinen gesamten Quellcode zur Verfügung gestellt, meine Login.html leer gelassen. –
Wenn ich Code auf Git sehe, dann fehlt AppContextListener in deinem Code. – khurram
Hallo, also habe ich in meinem Projekt AppcontextListener.java hinzugefügt, aber es gibt immer noch die gleiche Ausgabe. Wirf bitte einen Blick auf meinen GitHub-Link. Es wird sehr hilfreich für mich sein. –