asked on

webinitparam servlet error

Below example not working with attached error. Please advise

package com.gp.java;
 
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
 
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
 
@WebServlet(description = "ParameterName desc", urlPatterns = { "/ParameterNameUP" },
    //       initParams={@WebInitParam(name="defaultUser", value="g p")}

initParams = {@WebInitParam(name="defaultUser", value="value1")}

public class InitParamServlet extends javax.servlet.http.HttpServlet implements
        javax.servlet.Servlet {
 
    public InitParamServlet() {
        super();
    }
 
    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {/*
         
        PrintWriter pw = response.getWriter();
 
                //
                // Let's obtains parameters name here! 
                //
        Enumeration enumeration = request.getParameterNames();
        while (enumeration.hasMoreElements()) {
            String parameterName = (String) enumeration.nextElement();
            pw.println("Hello Parameter = " + parameterName);
        }
        pw.close();
    */
    	
    response.setContentType("text/html");
    PrintWriter writer=response.getWriter();
    String userName=request.getParameter("name");
    HttpSession session=request.getSession();
    
    ServletContext context= request.getServletContext();
    
    if( userName!="" & userName != null){
    	session.setAttribute("savedUserName", userName);
    	context.setAttribute("savedUserNamec", userName);
    }
    
    writer.println("Hellllooo request"+userName);
    writer.println("Hellllooo session"+(String)session.getAttribute("savedUserName"));
    writer.println("Hellllooo context"+(String)context.getAttribute("savedUserNamec"));
    writer.println("Hellllooo init param has default value of"+getServletConfig().getInitParameter("defaultuser"));
 //   this.getServletConfig().getInitParameter("defaultuser");
    
    
   
    }
 
    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
    }
}

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webInitParam.jpg

gudii9

ASKER

I tried as below from web.xml file as well passing initparam value getting null even then also in output

package com.gp.java;

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 XmlServlet
*/

public class XmlServlet extends HttpServlet {
      private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public XmlServlet() {
super();
// TODO Auto-generated constructor stub
}

      /**
       * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
       */
      protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            // TODO Auto-generated method stub
            System.out.println("hello from get of xml serv");
            PrintWriter writer=response.getWriter();
            writer.println("<h3>hello in html of xml serv</h3>");

                  String userNam=request.getParameter("userName");
                  writer.println("heello"+userNam);
                  String[] location=request.getParameterValues("location");
                  writer.println("u at"+location.length+"places");
                   writer.println("Hellllooo init param has default value of"+getServletConfig().getInitParameter("defaultuser"));
      }


      /**
       * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
       */
      protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            // TODO Auto-generated method stub
            System.out.println("hello from post of xml serv");
            PrintWriter writer=response.getWriter();
            writer.println("<h3>hello in html of xml serv</h3>");

                  String userNam=request.getParameter("userName");
                  writer.println("heello"+userNam);
                  String[] location=request.getParameterValues("location");
                  writer.println("u at"+location.length+"places");
      }

}

output shows null

as below
hello in html of xml serv
heelloss u at1places Hellllooo init param has default value ofnull

please advise

gudii9

ASKER

I tried below example
http://www.roseindia.net/java/javaee6/webInitParamExample.shtml

that worked fine though

ASKER CERTIFIED SOLUTION

Valeri

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gudii9

ASKER

that error is gone but when i try to run tomcat is giving error like

Server Tomcat v7.0 Server at localhost was unable to start within 45 seconds. If the server requires more time, try increasing the timeout in the server editor.

Please advise

Valeri

is there any exceptions? Have you setup tomcat in the right way?
Have a look here, probably you have missed something?!
http://www.howtosolvenow.com/2011/07/tomcat-configuration-in-eclipse-indigo/