Retrieve ServletContext from non-servlet class

A servlet calls a method which is located in another class which is not a servlet. Within this method of the non-servlet class, i need to access the ServletContext of the servlet that has called the method. What i am currently doing is simply passing the ServletContext as a parameter to the method.
I would like to avoid passing the ServletContext all the time, so i'm wondering if it's possible, from the non-servlet class, to retrieve the ServletContext of the servlet which has called the method of the non-servlet class.

Thanks J-Fine, that's a smart suggestion. BTW in the meantime i figured out that passing the ServletContext is not that bad idea, after all it reflects the structure of the app. However if i'll change my mind again i'll do like you suggested.

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Accessing ServletContext from non-servlet class

How i can get information servletcontext from a normal java class?
I am using Tomcat.
I have put some Strings in to the servlet context and i want to get this information from a normal java class.
I think there was a way to do it with getServlet() but this is deprecated.

One way to do this would be to store the info in some class of your own as a static member(arraylist/hashmap or something) and then retrieve it from your java class.
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hi,
I declare a non-servlet class which is defined by myself in a servlet class. I passed the complie but got an runtime error said NoClassDefFoundError. Does anyone can help me? Thanks.
The following is my code.
//get the search string from web form
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.net.*;
import java.util.*;
public class SearchEngines extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
String searchString = (String) request.getParameter("searchString");
     String searchType = (String) request.getParameter("searchType");
     Date date = new java.util.Date();
     response.setContentType("text/html");
PrintWriter out = response.getWriter();
Vector doc_retrieved = new Vector();
BooleanSearch bs = new BooleanSearch();
doc_retrieved=bs.beginSearch(searchString, searchType);
out.println("<HTML><HEAD><TITLE>Hello Client!</TITLE>" +
               "</HEAD><BODY>Hello Client! " + doc_retrieved.size() + " documents have been found.</BODY></HTML>");
out.close();
response.sendError(response.SC_NOT_FOUND,
"No recognized search engine specified.");
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
// a search engine implements the boolean search
import java.io.*;
import java.util.*;
import au.com.pharos.gdbm.GdbmFile;
import au.com.pharos.gdbm.GdbmException;
import au.com.pharos.packing.StringPacking;
import IRUtilities.Porter;
public class BooleanSearch{
     BooleanSearch(){;}
     public Vector beginSearch(String searchString, String searchType){
          Vector query_vector = queryVector(searchString);
          Vector doc_retrieved = new Vector();
          if (searchType.equals("AND"))
               doc_retrieved = andSearch(query_vector);
          else
               doc_retrieved = orSearch(query_vector);
          return doc_retrieved;
     private Vector queryVector(String query){
     Vector query_vector = new Vector();
          try{
               GdbmFile dbTerm = new GdbmFile("Term.gdbm", GdbmFile.READER);
          dbTerm.setKeyPacking(new StringPacking());
          dbTerm.setValuePacking(new StringPacking());
          query = query.toLowerCase();
          StringTokenizer st = new StringTokenizer(query);
          String word = "";
          String term_id = "";
          while (st.hasMoreTokens()){
               word = st.nextToken();
               if (!search(word)){
                    word = Stemming(word);
                    if (dbTerm.exists(word)){
               //          System.out.println(word);
                         term_id = (String) dbTerm.fetch(word);
                         query_vector.add(term_id);
          catch(GdbmException e){
               System.out.println(e.getMessage());
          return query_vector;
     private Vector orSearch(Vector query_vector){
          Vector doc_retrieved = new Vector();
          try{
               GdbmFile dbVector = new GdbmFile("Vector.gdbm", GdbmFile.READER);
               dbVector.setKeyPacking(new StringPacking());
               dbVector.setValuePacking(new StringPacking());
               int doc_num = dbVector.size();
               String doc_id = "";
               String temp = "";
               for (int i = 1; i <= doc_num; i++){
                    boolean found = false;
                    doc_id = String.valueOf(i);
                    temp = (String) dbVector.fetch(doc_id);
                    StringTokenizer st = new StringTokenizer(temp);
                    while (st.hasMoreTokens() && !found){
                         temp = st.nextToken();
                         StringTokenizer st1 = new StringTokenizer(temp, ",");
                         String term = st1.nextToken();
                         if (query_vector.contains(term)){
                              doc_retrieved.add(doc_id);
                              found = true;
          catch(GdbmException e){
               System.out.println(e.getMessage());
          return doc_retrieved;
     private Vector andSearch(Vector query_vector){
          Vector doc_retrieved = new Vector();
          try{
               GdbmFile dbVector = new GdbmFile("Vector.gdbm", GdbmFile.READER);
               dbVector.setKeyPacking(new StringPacking());
               dbVector.setValuePacking(new StringPacking());
               int doc_num = dbVector.size();
               String doc_id = "";
               String temp = "";
               for (int i = 1; i <= doc_num; i++){
                    Vector doc_vector = new Vector();
                    boolean found = true;
                    doc_id = String.valueOf(i);
                    temp = (String) dbVector.fetch(doc_id);
                    StringTokenizer st = new StringTokenizer(temp);
                    while (st.hasMoreTokens()){
                         temp = st.nextToken();
                         StringTokenizer st1 = new StringTokenizer(temp, ",");
                         String term = st1.nextToken();
                         doc_vector.add(term);
                    for (int j = 0; j < query_vector.size(); j++){
                         temp = (String) query_vector.get(j);
                         if (doc_vector.contains(temp))
                              found = found & true;
                         else
                              found = false;
                    if (found)
                         doc_retrieved.add(doc_id);
          catch(GdbmException e){
               System.out.println(e.getMessage());
          return doc_retrieved;
     private String Stemming(String str){
          Porter st = new Porter ();
          str = st.stripAffixes(str);
          return str;
     private boolean search(String str){
          //stop word list
          String [] stoplist ={"a","about","above","according","across","actually","adj","after","afterwards","again",
                                   "against","all","almost","alone","along","already","also","although","always","am","among",
                                   "amongst","an","and","another","any","anyhow","anyone","anything","anywhere","are",
                                   "aren't","around","as","at","away","be","became","because","become","becomes","becoming",
                                   "been","before","beforehand","begin","beginning","behind","being","below","beside",
                                   "besides","between","beyond","billion","both","but","by","can","cannot","can't",
                                   "caption","co","co.","could","couldn't","did","didn't","do","does","doesn't","don't",
                                   "down","during","each","eg","eight","eighty","either","else","elsewhere","end","ending",
                                   "enough","etc","even","ever","every","everyone","everything","everywhere","except",
                                   "few","fifty","first","five","for","former","formerly","forty","found","four","from",
                                   "further","had","has","hasn't","have","haven't","he","he'd","he'll","hence","her","here",
                                   "hereafter","hereby","herein","here's","hereupon","hers","he's","him","himself","his",
                                   "how","however","hundred","i'd","ie","if","i'll","i'm","in","inc.","indeed","instead",
                                   "into","is","isn't","it","its","it's","itself","i've","last","later","latter","latterly",
                                   "least","less","let","let's","like","likely","ltd","made","make","makes","many","maybe",
                                   "me","meantime","meanwhile","might","million","miss","more","moreover","most","mostly",
                                   "mr","mrs","much","must","my","myself","namely","neither","never","nevertheless","next",
                                   "nine","ninety","no","nobody","none","nonetheless","noone","nor","not","nothing","now",
                                   "nowhere","of","off","often","on","once","one","one's","only","onto","or","other","others",
                                   "otherwise","our","ours","ourselves","out","over","overall","own","per","perhaps","pm",
                                   "rather","recent","recently","same","seem","seemed","seeming","seems","seven","seventy",
                                   "several","she","she'd","she'll","she's","should","shouldn't","since","six","sixty",
                                   "so","some","somehow","someone","sometime","sometimes","somewhere","still","stop",
                                   "such","taking","ten","than","that","that'll","that's","that've","the","their","them",
                                   "themselves","then","thence","there","thereafter","thereby","there'd","therefore",
                                   "therein","there'll","there're","there's","thereupon","there've","these","they","they'd",
                                   "they'll","they're","they've","thirty","this","those","though","thousand","three","through",
                                   "throughout","thru","thus","to","together","too","toward","towards","trillion","twenty",
                                   "two","under","unless","unlike","unlikely","until","up","upon","us","used","using",
                                   "very","via","was","wasn't","we","we'd","well","we'll","were","we're","weren't","we've",
                                   "what","whatever","what'll","what's","what've","when","whence","whenever","where",
                                   "whereafter","whereas","whereby","wherein","where's","whereupon","wherever","whether",
                                   "which","while","whither","who","who'd","whoever","whole","who'll","whom","whomever",
                                   "who's","whose","why","will","with","within","without","won't","would","wouldn't",
                                   "yes","yet","you","you'd","you'll","your","you're","yours","yourself","you've"};
          int i = 0;
          int j = stoplist.length;
          int mid = 0;
          boolean found = false;
          while (i < j && !found){
               mid = (i + j)/2;
               if (str.compareTo(stoplist[mid]) == 0)
                    found = true;
               else
                    if (str.compareTo(stoplist[mid]) < 0)
                         j = mid;
                    else
                         i = mid + 1;
          return found;
     }

please show us the full error message.
it sounds like a classpath problem...

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In my jsp page:
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%>
I was told that I simply have to put it in the
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<%
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please show us the full error message.
it sounds like a classpath problem...

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thanks

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Thanx

Hi Rajesh!
I have tried your code. But some where i went wrong. Please correct me: I am using NWDS2.0.9
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
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          <url-pattern>/DisplayRes/*</url-pattern>
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my application.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE application PUBLIC "-//Sun Microsystems, Inc.//DTD J2EE Application 1.3//EN"
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</application>
and my servlet code:
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.Writer;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.xml.sax.EntityResolver;
import org.xml.sax.SAXException;
import com.sun.java_cup.internal.parser;
import com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl;
public class DisplayRes extends HttpServlet {
     public void doGet(HttpServletRequest requset, HttpServletResponse response) throws ServletException, IOException
          doWork(requset, response);
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          doWork(req, resp);
     private void doWork(HttpServletRequest req, HttpServletResponse resp) throws IOException
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          PrintWriter out = null;
          PrintWriter p2=resp.getWriter();
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               resp.setContentType("text/xml");
               out = resp.getWriter();
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               path = req.getPathInfo();
               if(req.getContentLength() != -1){
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          private void outputURI(InputStream resultStream, PrintWriter out) {
          if (resultStream == null) {
//             no default file
//            logger.error("No File to return");
          return;
          try {
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//            Class clazz = loader.loadClass("org.apache.xerces.jaxp.DocumentBuilderFactoryImpl");
//            DocumentBuilderFactoryImpl factory = (DocumentBuilderFactoryImpl) clazz.newInstance();
//            DocumentBuilder parser = factory.newDocumentBuilder();
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          resultStream.close();
          } catch (Exception e) {
//            logger.error("Trying to parse the output " , e);
     //private void printXML(Document document, Writer writer) throws Exception {
          private void printXML(Document document, PrintWriter writer) throws Exception {
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Retrieve data from a bean into a Servlet

Hi,
I created a simple JSP file called index.jsp situated in application root, then I associated this JSP with a java bean in order to collect data after the form submission, the attribute Action inside the Form tag points on a Servlet called Login situated in the application com.myapp.servlets package.
the problem is that, using the scope="session" in the JSP page, I'm able to get catch the bean generated after the submission of the form, even the action is the Servlet called Login neither a back to the currest JSP or a redirection to another JSP, but in the same time, when I try to use bean methods to read the data (username, password) it gives null as result, I'm not able to understand the behavior of the bean which is created via Form submission but unreachable via the Servlet.
herese the code
the JSP (index.jsp)
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<jsp:useBean id="MyBean" scope="session" class="com.datalog.beans.LoginBean"/>
<jsp:setProperty name="MyBean" property="*"/>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Document sans nom</title>
</head>
<body>
<table width="100%" border="1">
<tr>
    <td> </td>
</tr>
<tr>
    <td><form name="form1" method="post" action="doLogin">
      <table width="100%" border="0" cellspacing="0">
        <tr>
          <td width="30%">username : </td>
          <td><input name="username" type="text" id="username"></td>
        </tr>
        <tr>
          <td>password : </td>
          <td><input name="password" type="password" id="password"></td>
        </tr>
        <tr>
          <td> </td>
          <td><input type="submit" name="Submit" value="Envoyer"></td>
        </tr>
      </table>
    </form></td>
</tr>
<tr>
    <td>username after submission <jsp:getProperty name="MyBean" property="username" /><br>
     password after submission <jsp:getProperty name="MyBean" property="password" /></td>
</tr>
</table>
</body>
</html>The bean (LoginBean.java)
package com.datalog.beans;
import java.io.Serializable;
public class LoginBean implements Serializable {
    private String username;
    private String password;
    public LoginBean(){
        System.out.println("i'm the bean ... "+this);
    public String getPassword() {
        return password;
    public void setPassword(String password) {
        this.password = password;
        System.out.println(this.password);
    public String getUsername() {
        return username;
    public void setUsername(String username) {
        this.username = username;
        System.out.println(this.username);
}Servlet (Login.java)
* Created on 14 d�c. 2004
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
package com.datalog.cpservlets;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import com.datalog.beans.LoginBean;
* Servlet Class
* @web.servlet              name="Login"
*                           display-name="Name for Login"
*                           description="Description for Login"
* @web.servlet-mapping      url-pattern="/Login"
* @web.servlet-init-param   name="A parameter"
*                           value="A value"
public class Login extends HttpServlet {
    public Login() {
        super();
        // TODO Auto-generated constructor stub
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
        // TODO Auto-generated method stub
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
        throws ServletException,
        IOException {
        // TODO Auto-generated method stub
        super.doGet(req, resp);
    protected void doPost(
        HttpServletRequest request,
        HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        PrintWriter out = response.getWriter();
        out.println("<br><br>Servlet (Login) in use.<br>");
        out.println("username from request.getParameter : "+request.getParameter("username")+"<br>");
        out.println("password from request.getParameter : "+request.getParameter("password")+"<br>");
        out.println("<br><br>Trying to use the bean...<br>");
        HttpSession session = request.getSession();
        LoginBean myBean = (LoginBean)session.getAttribute("MyBean");
        out.println("supposed bean adr : "+myBean);
        out.println("<br>username from myBean.getUsername : <b>"+myBean.getUsername()+"</b><br>");
        out.println("<br>password from myBean.getPassword : <b>"+myBean.getPassword()+"</b><br>");
}thank's.

The code that would populate the bean is here:
<jsp:useBean id="MyBean" scope="session" class="com.datalog.beans.LoginBean"/>
<jsp:setProperty name="MyBean" property="*"/>
When this code runs, it
1 - creates a LoginBean (if one is not already present)
2 - Populates the loginBean from the request parameters.
But this code is currently running when you generate the login page - not when you push the submit button.
Solutions
1 - Submit the form to a JSP page which runs the jsp:setProperty tag and then forwards to your Login servlet
2 - Retrieve the request parameters in your servlet and populate the bean. The jakarta commons BeanUtils are the standard way to go here. They are actually preferable to the jsp:setProperty tag which has some "features" in its use.
Cheers,
evnafets

Retrieving data from oracle database and displaying using servlets

//DataRetrieving.class file
import java.io.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class DataRetrieving extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse response)throws
ServletException, IOException{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("A program for connecting oracle database");
try
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:ORCL", "scott","tiger");
Statement stmt = con.createStatement();
ResultSet r = stmt.executeQuery ("SELECT ename,job,sal,comm,deptno FROM emp");
while ( r.next() )
     String bar = r.getString("ename");
     String bar1 = r.getString("job");
     float bar2 = r.getInt("sal");
     float bar3 = r.getInt("comm");
     int bar4 = r.getInt("deptno");
     //out.println(r.getString(0)+" "+r.getString("ename"));
     out.println("hi");
     out.println(bar1);
r.close();
stmt.close();
con.close();
catch (Exception e)
out.println("ERROR : " + e);
//web.xml file
<?xml version="1.0" encoding="ISO-8859-1"?>

<web-app>
<servlet>
<servlet-name>Hello</servlet-name>
<servlet-class>DataRetrieving</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Hello</servlet-name>
<url-pattern>/DataRetrieval</url-pattern>
</servlet-mapping>
</web-app>
while running the servlet , i am unable to retrieve the data
The error message i am getting is
A program for connecting oracle database
ERROR : java.lang.ClassNotFoundException: oracle.jdbc.driver.OracleDriver
after running the servlet.
what could be the problem?

import java.io.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class myserv extends HttpServlet
public void doGet(HttpServletRequest req,HttpServletResponse res)throws ServletException,IOException
res.setContentType("text/html");
PrintWriter pw=res.getwriter();
pw.println("Connecting data base");
     try
     Class.forName("oracle.jdbc.driver.OracleDriver");
     Connection con=Drivermanager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl","scott","tiger");
     Stamtenet st=con.createStament();
     Resultset rs=con.executeQurey("select * from emp");
     while(rs.next())
     rs.getInt("empno")+" "+rs.getDouble("sal"));
     }catch(Exception e)
}

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