friends i have got
following Error in my code HTTP Status 500 -
--------------------------------------------------------------------------------
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
java.lang.NullPointerException at com.leaveapp.servlets.LoginServlets.doPost(LoginServlets.java:95)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:260)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2396)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:405)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:380)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:508)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:533)
at java.lang.Thread.run(Thread.java:534)
--------------------------------------------------------------------------------
Apache Tomcat/4.1.12
my Servlet code is package com.leaveapp.servlets ;
import java.io.*;
import javax.servlet.ServletException;
import javax.servlet.http.*;
import java.util.*;
import com.leaveapp.utils.*;
import javax.servlet.*;
/* this is Servlet used to check whether user is valid or not for that it uses password as Key */
public class LoginServlets extends HttpServlet {
private Map users= new Hashtable();
private
String form_id;
private String username;
private String password;
public void init() {
users.put("ganesh","g.pol");
users.put("poonam","p.gupta");
users.put("vivek","v.padh");
users.put("jayesh","j.khanvilkar");
}
/*setter methods for Servlet */
private void setForm_id(String fi){
this.form_id=fi;
}
private void setUsername(String un){
this.username=un;
}
private void setPassword(String pw)
{
this.password=pw;
}
/* getter methods for Servlet */
private String getForm_id()
{
return form_id;
}
private String getUsername()
{
return form_id;
}
private String getPassword()
{
return form_id;
}
public boolean checkuser(String form_id, String username ,String password ) {
if (form_id !=null && form_id.equals("loginform"))
{
if(username != null && password != null && username.equals((String) users.get(password)))
{
return true;
}
else {
return false;
}
}
return false;
}
public void
doPost(HttpServletRequest request,
HttpServletResponse response) throws IOException,ServletException {
/*getting parameters from request */
form_id = request.getParameter(Constants.FORM_ID);
username=request.getParameter(Constants.USER_NAME);
password=request.getParameter(Constants.USER_PASSWORD);
setForm_id(form_id);
setUsername(username);
setPassword(password);
System.out.println("saaasas min post");
if(checkuser(getForm_id(),getUsername(),getPassword()))
{ /* he is valid user hence do necessary action*/
System.out.println("you are valid user");
}
else
<------------- main problem Area { System.out.println("you are elsr");
RequestDispatcher rd=request.getRequestDispatcher("../Jsp/login/Loginerror.jsp");
System.out.println("you are RequestDispatcher"+rd);
<----Request Dipatcher is null rd.forward(request,response);
// request.getContext.getRequestDispatcher("../Jsp/login/Loginerror.jsp").forward(request,response);
}
}//end of post
}
on Server side i have got 08-Aug-2005 18:24:12 org.apache.commons.modeler.Registry loadRegistry
INFO: Loading registry information
08-Aug-2005 18:24:12 org.apache.commons.modeler.Registry getRegistry
INFO: Creating new Registry instance
08-Aug-2005 18:24:13 org.apache.commons.modeler.Registry getServer
INFO: Creating MBeanServer
08-Aug-2005 18:24:13 org.apache.coyote.http11.Http11Protocol init
INFO: Initializing Coyote HTTP/1.1 on port 8080
Starting service Tomcat-Standalone
Apache Tomcat/4.1.12
08-Aug-2005 18:24:16 org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on port 8080
08-Aug-2005 18:24:16 org.apache.jk.common.ChannelSocket init
INFO: JK2: ajp13 listening on tcp port 8009
08-Aug-2005 18:24:16 org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=16/31 config=C:\Program Files\Apache Group\Tomcat 4.1\conf\jk2.properties
saaasas min post
you are elsr
you are RequestDispatchernull
<------------here Request Dispatcher objet is null Look For your Kind HElp
Thanks in Advance