java - Stuck in "Concurrency In Practise" article no Listing 2.1. A Stateless Servlet -

from book:

2.1.1. example: stateless servlet in chapter 1, listed number of frameworks create threads , call components threads, leaving responsibility of making components thread-safe. often, thread-safety requirements stem not decision use threads directly decision use facility servlets framework. we're going develop simple examplea servlet-based factorization serviceand extend add features while preserving thread safety.

listing 2.1 shows our simple factorization servlet. unpacks number factored servlet request, factors it, , packages results servlet response.

and code example

@threadsafe   public class statelessfactorizer implements servlet {  public void service(servletrequest req, servletresponse resp) {       biginteger = extractfromrequest(req);       biginteger[] factors = factor(i);        encodeintoresponse(resp, factors);           }       }   

with nothing else provided, tried things working first writing simple servlet in eclipse using dynamic-web module worked , modified servlet said in above example following code. time getting 404 error, how can test new servlet

implements servlet  

instead

extends httpservlet 

code tried:

package com.serialize;  import java.io.ioexception; import java.io.printwriter; import java.math.biginteger;  import javax.servlet.servlet; import javax.servlet.servletconfig; import javax.servlet.servletexception; import javax.servlet.servletrequest; import javax.servlet.servletresponse; import javax.servlet.annotation.webservlet; import javax.servlet.http.httpservlet; import javax.servlet.http.httpservletrequest; import javax.servlet.http.httpservletresponse;  /**  * servlet implementation class test1  */ @webservlet("/test1") public class test1 implements servlet {     private static final long serialversionuid = 1l;      /**      * @see httpservlet#httpservlet()      */     public test1() {         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         printwriter pw = response.getwriter();         pw.print("test1");     //  service(request, response);     }      /**      * @see httpservlet#dopost(httpservletrequest request, httpservletresponse response)      */     protected void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {         // todo auto-generated method stub     }      @override     public void destroy() {         // todo auto-generated method stub      }      @override     public servletconfig getservletconfig() {         // todo auto-generated method stub         return null;     }      @override     public string getservletinfo() {         // todo auto-generated method stub         return null;     }      @override     public void init(servletconfig arg0) throws servletexception {         // todo auto-generated method stub      }      @override     public void service(servletrequest req, servletresponse resp)             throws servletexception, ioexception {         // todo auto-generated method stub         biginteger = extractfromrequest(req);         biginteger[] factors = factor(i);         printwriter pw = resp.getwriter();         pw.print(factors);        // encodeintoresponse(resp, factors);     }      private biginteger extractfromrequest(servletrequest req) {         // todo auto-generated method stub         string num = req.getparameter("factor");         return biginteger.valueof(long.parselong(num));     }      private biginteger[] factor(biginteger i) {         // todo auto-generated method stub         long number = i.longvalue();         biginteger[] ret = null ;         for(long j=2,indx=0;j<number/2;j++)         {             while(number%j == 0)             {                 ret[(int) indx++]=biginteger.valueof(j);                 number = number / j;             }          }          return ret;     } } 

any highly appreciated.

put code inside of doget method, not inside service method.

don't implement servlet, extend httpservlet class.

your code should similar 1 this tutorial