New to jsp

Hi
Would u please have a look at the following files and tell me why the jsp is not working properly?
thanks,
C
Names.java
package tjo;
import java.util.*;
public class Names {
String answer;
boolean success;
String hint;
int numGuesses;
public Names() {
reset();
public void setGuess(String guess) {
numGuesses++;
String g;
try {
g = guess;
catch (Exception e) {
g = "invalid";
if (g ==answer)
success = true;
else
hint = "c";
public boolean getSuccess() {
return success;
public String getHint() {
return "" + hint;
public int getNumGuesses() {
return numGuesses;
public void reset() {
answer ="Lucy";
success = false;
numGuesses = 0;
//End of Names.java
Naming.jsp
<%@ page import ="tjo.Names" %>
<jsp:useBean id="namehandler" class="tjo.Names" scope="session"/>
<jsp:setProperty name="namehandler" property="*"/>
<html>
<head>
<title>Guess my name</title>
</head>
<body>
<font size =5>
<% if(namehandler.getSuccess()==true ){ %>
Congratulations! You got it!<p>
<% namehandler.reset(); %>
Care to try again?
<% }else if(namehandler.getNumGuesses()== 0){ %>
Welcome to the guessing game. <p>
Can you guess what my name is? <p>
<form method = get>
What's your guess?<input type=text name=guess>
<input type=submit value="Submit">
</form>
<% }else { %>
Good guess, but no.Try <b><%= namehandler.getHint() %></b>
You have made <%= namehandler.getNumGuesses() %> guesses. <p>
What's my name? <p>
<form method = get>
What's your guess?<input type=text name=guess>
<input type=submit value="Submit">
</form>
<% } %>
</font>
</body>
</html>
//End of Naming.jsp

Hello Countess,
Lets start with Name.java:
There is no need to import java.util package as you don't seem to use any classes in it.
You do not need the try-catch block as an exception will never be thrown in this situation (both g and guess are strings, and you don't call any methods on them), in fact use the parameter variable directly (it's more efficient memory usage), ie.
public void setGuess(String guess) {
numGuesses++;
if (guess.equals(answer)) {
success = true;
else {
hint = "c";
Also, hint is a string so there's no need to append it to an empty string in getHint(), ie.
public String getHint() {
return hint;
Now for Name.jsp:
There is no need for the import directive,
<jsp:useBean id="namehandler" class="tjo.Names" scope="session"/>
does the importing for you.
<jsp:setProperty name="namehandler" property="*"/> ??
This action will cause you more problems than anything.
Your class has four variables (answer, success, hint, and numGuesses). However your jsp can only see success, hint, and numGuesses because of the get methods you've declared in your class (which return these variables).
In fact, your jsp will assume there is another property called guess as you have also declared the setGuess method (it is not important that this property does not actually exist).
So calling the jsp:setProperty method will raise an exception, as you do not have a property (variable in your class) called '*' (I don't think you can use an asterix for a variable anyway) More importantly though you do not have a set method for that property, ie.
public void setGuess(String g) can be invoked in your jsp by
<jsp:setProperty name="nameHendler" property="guess" value="Lucy"/>
(cut the set or get of the front of the method, and this is what ths jsp thinks it is acting on. It will still do what ever you write in the method)
Looking at your jsp more closely, it seems you are trying to retrieve a request parameter. In which case you must type,
<jsp:setProperty name="namehandler" property="guess" param="guess"/>
The param value you give here is the name of the input element in the form from the preceeding page, but in this case this page, ie.
What's your guess?<input type="text" name="guess"/>
And instead of writing,
Good guess, but no.Try <b><%= namehandler.getHint() %></b>
You have made <%= namehandler.getNumGuesses() %> guesses.
try,
Good guess, but no. Try
<b><jsp:getProperty name="nameHandler" property="hint"/></b>
You have made
<jsp:getProperty name="nameHandler" property="numGuesses"/> guesses.
Also try putting font settings in the style attribute of the body tag, ie.
<body style="font-size: 5px">
Hope this helps. I am watching this topic so if you still cant get you app to work post another message and I'll try help.
Darren ;-p

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<%@page contentType="text/html" pageEncoding="UTF-8"%>
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<html>
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import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
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import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;
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type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException
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java.lang.NullPointerException
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help?

login.java:56 is:
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New on JSP

Hello,
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          "Mr. x" <[email protected]> wrote:
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Setting environment for a new custom JSP

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Below code might be useful.
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<%
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%>
Regards,
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Plz help me out new to jsp

package abc;
class UserDetails
// i have used this class basically for declaration of variables.
public class BulkSmsFunctions
BulkSmsFunctions()
{// constructor}
// in this class i have 5-6 functions
public static void amin(String args[])
// i have left my psvm as empty.
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now i have a jsp page which has to create an object of BulkSmsFunctions and call the various functions.
i have the following code for the jsp page:
<%@ page import = "java.util.*"%>
<%@ page import = "java.lang.*"%>
<%@ page import = "java.io.*"%>
<%@ page import = "abc.*"%>//importing the package
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<body>
<%
String PROVISIONING_LOG_PATH="C:\\bulksmsfolder";
String USERS_ACTIVE_DETAILS_FILE="CountDetails";
String USERS_PACKAGE_SUBSCRIPTION_LOGS_FILE="ServiceLog";
String SERVICE_SUBSCRIPTION_PACKAGES_MASTER_FILE="PacksMasterFile";
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An error occurred at line: 7 in the jsp file: /jsp/natasha/hello.jsp
Generated servlet error:
[javac] Compiling 1 source file
C:\jakarta-tomcat-4.1.31\work\Standalone\localhost\examples\jsp\natasha\hello_jsp.java:56: tcs.BulkSmsFunctions is not public in tcs; cannot be accessed from outside package
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^
An error occurred at line: 7 in the jsp file: /jsp/natasha/hello.jsp
Generated servlet error:
C:\jakarta-tomcat-4.1.31\work\Standalone\localhost\examples\jsp\natasha\hello_jsp.java:56: tcs.BulkSmsFunctions is not public in tcs; cannot be accessed from outside package
     BulkSmsFunctions objBulkSms= new BulkSmsFunctions();
^
An error occurred at line: 7 in the jsp file: /jsp/natasha/hello.jsp
Generated servlet error:
C:\jakarta-tomcat-4.1.31\work\Standalone\localhost\examples\jsp\natasha\hello_jsp.java:56: BulkSmsFunctions() is not public in tcs.BulkSmsFunctions; cannot be accessed from outside package
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^
An error occurred at line: 7 in the jsp file: /jsp/natasha/hello.jsp
Generated servlet error:
C:\jakarta-tomcat-4.1.31\work\Standalone\localhost\examples\jsp\natasha\hello_jsp.java:60: processSmsCountDetails(java.lang.String,java.lang.String) is not public in tcs.BulkSmsFunctions; cannot be accessed from outside package
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^
4 errors

try
modify constructor of BulkSmsFunctions to public as in
public BulkSmsFunctions() { etc etc

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Hi ,
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Database Error
An Operation on the Movie Database Failed!
org.apache.jasper.JasperException: Cannot find any information on property 'movie' in a bean of type 'db.UpdateMovies'
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     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
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     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
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     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
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     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
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     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
     at java.lang.Thread.run(Unknown Source)
Anyone have any idea wat's went wrong? Please advice .......& Thanks alot for yr help
Regards,
huiqin

from what you're saying, it would sound like a duplicate entry of key constraint violation
your stack trace is simply saying that there is a problem with the bean being null or not initialized, and this is likely due to the database failing
you need to get the database specific error and/or error code, this JSP error won't help in debugging the problem

Compile a new created jsp

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kevin

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Please help me ! new to jsp

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My code in the servlet is
resultSet = statement.executeQuery("SELECT * from kiosk_hitcount where kiosk_name like 'Altoona%' and l_category ='" + request.getParameter("category") + "' group by l_categoryb order by l_categoryb asc");
Vector data = new Vector();
while(resultSet.next())
String rowdata= resultSet.getString("l_categoryb");
data.addElement(rowdata);
request.getSession().setAttribute("data", data);
RequestDispatcher rd = getServletContext().getRequestDispatcher("/MyKiosk/CategoryTest.jsp");
rd.forward(request,response);
in jsp page:
<tr><td><Font size='2'><H3>Local Sub-Category:</H3></Font></td>
<td><SELECT name="bcategory">
<%
Vector data = new Vector();
data = (Vector)request.getSession().getAttribute("data");
for(int i = 0; i< data.size(); i++)
String catb = (String)data.get(i);
%>
<OPTION value="<%= catb%>" ><%= catb%></OPTION>
<%
%>
</SELECT></TD></TR>
Thank you ,
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Here is the stackTrace for the Exception
java.lang.NullPointerException
at MyKiosk._0002fMyKiosk_0002fCategoryTest_0002ejspCategoryTest_jsp_82._jspService(_0002fMyKiosk_0002fCategoryTest_0002ejspCategoryTest_jsp_82.java:176)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:177)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:318)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:391)
at org.netbeans.modules.web.tomcat.JspServlet.service(JspServlet.java:91)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
at org.apache.tomcat.core.Handler.service(Handler.java:286)
at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:210)
at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
at java.lang.Thread.run(Thread.java:484)

New to JSP-How to run a .jsp file

I Have just begin to learn JSP. I downloaded the JSP developer kit from java.sun.com. However I dont know how to proceed. I have seen references to'the container'. what is it and how do I start it? and the same for the server which I have in the form a batch file. How do I configure the environment? Are there any prerequisites to using this kit wrt software? Please do help me, since I am absolutely clueless
Regards,
Sweta

Hi Sweta,
Please use any editor like eclipse or netbeans or you create one jsp page(assumes you know jsp).
and then create two folders web-inf inside which create classes and lib folder and web.xml is created, and meta-inf inside which context.xml is created. And use tomcat container to deploy.
Apache tomcat is container which would receive the client request from browser that will route to servlet/jsp.
whereas Apache webserver is different it provides the request to container if it exists then we can replace localhost:8080 by user defined.
JSP is nothing but Dynamic web page creator which embed java program in html.
JSPinit initializes and while running converts to servlet and will be processed according to the java code embed and display as per the html tags.
But you should use struts framework why it is constructed upon MVC architecture and purely object oriented.
So struts is nothing but the execution calls are drived by configuration xml files.
If anything you need to know in details, pls msg me to [email protected]
Thanking you
Charles v c

New to Jsp. Jsp and java bean not running

hi
i have created a simple jsp file and using a java bean. but it is showing errors. my file directory structure in tomcat4.1 is:
aptechsamples:
index.jsp
WEB-INF/classes:
myPackage:
Counter.class
i have no web.xml file i dont know how to use it or not. i need it or not.
the index.jsp file:<html>
<head><title> A Simple JSP Bean </title></head>
<body>
<%@ page language ="java" %>
<%@ page import ="mypackage.Counter" %>
<jsp:useBean id="id_counter" scope="session" class ="Counter"/>
<jsp:setProperty name="id_counter" property="count" param="count" />
<jsp:getProperty name="id_counter" property="count" />
</body>
</html>the Counter.java file is: package mypackage;
public class Counter{
     String msg;
     public Counter(){
          msg = "Hello World";
     public String getCount(){
          return msg;
     public void setCount(String c){
          msg = c;
}please help me and tellme what the hell is wrong with it or me. im getting an error:
exception
org.apache.jasper.JasperException: Cannot create bean of class Counter

Java is already telling you what is wrong: it cannot create an instance of your Counter class. The reason being: it can't find it.
What do you mean by "myPackage"? Before you can use any class in your JSP's or servlets, they MUST be stored in a package. If you don't know what that is, I highly suggest you lookup "java package" and "java classpath" using google.
Let's say your Counter class is in a package mypackage (so it starts with the line package mypackage;). Then you have to store the .class file as:
WEB-INF/classes/mypackage/Counter.class
If done correctly, the error message should disappear.

New to JSP - what do i need

Is there a step-by-step guide to setting up an environment for running JSP pages. I can't seem to get my pages to work, they fall over with the syntax error when declaring variables. I'm using IIS.
Also, does anyone know what the extension .do is used for. We are using SAP crm and it uses JSP pages, but they seem to have a similiar file with a .do extension.
cheers,
steven.

Maybe, you want to start from
http://java.sun.com/j2ee/tutorial/1_3-fcs/doc/JSPIntro.html.
IIS wont understand .JSP unless you have a JSP filter for IIS. For trying out try using Tomcat.
.do - I beleive, its part of Struts. I don't know much abt it.
HTH.

Hi I am new to Jsp,Please help me.

This is my Jsp Program:
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
public class login extends HttpServlet {
private String target = "/welcome.jsp";
private String getUser(String username, String password) {
// Just return a static name
// If this was reality, we would perform a SQL lookup
return "Frodo";
public void init(ServletConfig config)
throws ServletException {
super.init(config);
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
// If it is a get request forward to doPost()
doPost(request, response);
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
// Get the username from the request
String username = request.getParameter("username");
// Get the password from the request
String password = request.getParameter("password");
String user = getUser(username, password);
// Add the fake user to the request
request.setAttribute("USER", user);
// Forward the request to the target named
ServletContext context = getServletContext();
RequestDispatcher dispatcher =
context.getRequestDispatcher(target);
dispatcher.forward(request, response);
public void destroy() {
when i compile this i got this error:
cannot find symbol:
setAttribute()
request.setAttribute("USER",user);
cannot find symbol:
class RequestDispatcher
RequestDispatcher dispatcher =
context.getRequestDispatcher(target);

Hey no need of that . you can use request scoped attributes too.
and remember this is not JSP. it's a SERVLET
your code is completely correct. there are no errors in it. i am pasting your code. just check it.
It's working properly. no compile time errors occured.
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class login extends HttpServlet {
     private String target = "/welcome.jsp";
     private String getUser(String username, String password) {
//          Just return a static name
//          If this was reality, we would perform a SQL lookup
          return "Frodo";
     public void init(ServletConfig config)
     throws ServletException {
          super.init(config);
     public void doGet(HttpServletRequest request,
               HttpServletResponse response)
     throws ServletException, IOException {
//          If it is a get request forward to doPost()
          doPost(request, response);
     public void doPost(HttpServletRequest request,
               HttpServletResponse response)
     throws ServletException, IOException {
//          Get the username from the request
          String username = request.getParameter("username");
//          Get the password from the request
          String password = request.getParameter("password");
          String user = getUser(username, password);
//          Add the fake user to the request
          request.setAttribute("USER", user);
//          Forward the request to the target named
          ServletContext context = getServletContext();
          RequestDispatcher dispatcher =
               context.getRequestDispatcher(target);
          dispatcher.forward(request, response);
     public void destroy() {
}Let me know where you are getting issues exactly.
Diablo

New to JSP, where to start?

Hi all,
I decided to take a look at JSP and was wondering what things I need to install/configure to get an environment running. What are your recommendations for a webserver, editor, online resources etc.
I'm fairly experienced with PHP and ASP programming and have 2-3 years background in OOP.
thanks for your time!
regards,
Christophe

I decided to take a look at JSP and was wondering
what things I need to install/configure to get an
environment running. What are your recommendations
for a webserver, editor, online resources etc.(1) Download the Tomcat servlet/JSP engine from Jakarta Apache:
http://jakarta.apache.org/tomcat
(2) Download the JSP Standard Tag Library, also from Jakarta Apache (you'll want version 1.1 to go with Tomcat 5.5):
http://jakarta.apache.org/taglibs
(3) Go buy Hans Bergsten's JSP book from O'Reilly. I think it's the best, because it uses JSTL from the first page. That's the proper way to learn how to write JSPs.
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New to jsp

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