У меня есть сервлет "ShowEvents", и я пытаюсь перенаправить на страницу jsp "EventsOfClub.jsp", которая находится в папке WebContent. Я использую Эклипс. Но когда я делаю вперед, ничего не происходит. Я знаю, что это распространенная ошибка, но я просмотрел здесь много вопросов и не смог найти правильный путь к ресурсу (что, как мне кажется, является проблемой). Пожалуйста помоги.
Показать события:
request.getRequestDispatcher("EventsOfClub.jsp").forward(request, response);
EDIT: когда пользователь входит в систему, я перенаправляю (не перенаправляю) сервлет ShowEvents как:
response.sendRedirect("ShowEvents");
А затем перейдите от ShowEvents к «EventsOfClub.jsp», как я сказал ранее. Я думал, что проблема в том, что я не пересылал. Но теперь, когда я перехожу от Login к ShowEvents как
request.getRequestDispatcher("ShowEvents").forward(request, response);
У меня такая же проблема, то есть он остается при входе в систему и отображает пустую страницу. (Раньше ShowEvents показывал пустую страницу)
EDIT: Трассировка стека:
SEVERE: Servlet.service() for servlet jsp threw exception
java.lang.NullPointerException
at org.apache.jsp.EventsOfClub_jsp._jspService(EventsOfClub_jsp.java:116)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
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.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:487)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:412)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
at ShowEvents.doPost(ShowEvents.java:82)
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.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:487)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:412)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
at Login.doPost(Login.java:88)
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.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
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:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
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:1041)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Сервлет входа
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
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;
import javax.servlet.http.HttpSession;
/**
* Servlet implementation class Login
*/
@WebServlet(description = "Enter credentials", urlPatterns = { "/Login" })
public class Login extends HttpServlet
{
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public Login()
{
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{ }
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
//POST "localhost:8080/login"
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
String name = (String) request.getParameter("username");
String pass = (String) request.getParameter("password");
Connection conn = null;
String p="";
try
{
Class.forName("org.postgresql.Driver");
conn = DriverManager.getConnection("jdbc:postgresql://localhost:6666/Festeria", "postgres", "darthvedarvyas");
HttpSession session = request.getSession();
session.setAttribute("connection", conn);
session.setAttribute("uname", name);
Statement stmt = null;
stmt = conn.createStatement();
//some DB code
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher(redirect);
dispatcher.forward(request,response);
}
catch(Exception e)
{
e.printStackTrace();
String msg = "Oops! An error has occured! <br> Please try again.";
request.getSession().setAttribute("msg", msg);
response.sendRedirect("Error.jsp");
}
}
}
EventsOfClub.jsp
а какой у тебя код в 82 строкеShowEvents.java
? - person Abhishek Nayak   schedule 04.05.2014