Jsp Bean

Hi all,
I want to create a bean Array such that one set and get propertues can be used for repeated operations.
That is i am creating Online Exam in that i am selecting Exam Question and options in that one question has 4 options and another question has 5 options i want to display that options in jsp page by using getProperty options in the Bean.How to i do it (at present i created option1 option2,option3,option4 in set and get Properties please helpme to solve this
Regards
Beval

Return all the options from your bean as a Collection. This way you can retrieve the options with one get call, and then use an Iterator in your page to loop through the number of options you havea, without needing to know exactly how many were returned.
If you are not familar with Collections then check our the Java Tutorial for more info.
Kevin Hooke
Kev's Development Toolbox
http://www.kevinhooke.com

Similar Messages

Prob with running jsp Bean

Hi,
I am trying to run a bean through a jsp but its giving error at useBean tag of jsp:
The error is :
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: /Quadratic.jsp(7,0) The value for the useBean class attribute com.brainysoftware.Quadratic is invalid.
     org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:39)
     org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:409)
     org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:150)
     org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1227)
     org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1116)
     org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
     org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2213)
     org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2219)
     org.apache.jasper.compiler.Node$Root.accept(Node.java:456)
     org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
     org.apache.jasper.compiler.Generator.generate(Generator.java:3272)
     org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:244)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:470)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
     org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
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My jsp is:
<HTML>
<HEAD>
<TITLE> JSP BEAN Quadratic Example </TITLE>
</HEAD>
<BODY>
<%@ page language="java" %>
<jsp:useBean id="quadratic" scope="session" class="com.brainysoftware.Quadratic" />
<jsp:setProperty name="quadratic" property="ia" param="a" />
<jsp:setProperty name="quadratic" property="ib" param="b" />
<jsp:setProperty name="quadratic" property="ic" param="c" />
X1= <%= quad.getDx1( ) %>
X2= <%= quad.getDx2( ) %>
End of program
</BODY>
</HTML>my bean is:
package com.brainysoftware;
import java.io.*;
class Quadratic{
int ia;
int ib;
int ic;
String dx1;
String dx2;
public int getIa( ) {
return ia;
public void setIa( int ii) {
ia=ii;
public int getIb( ) {
return ib;
public void setIb(int ii) {
ib=ii;
public int getIc( ) {
return ic;
public void setIc(int ii) {
ic=ii;
public String getDx1( ) {
double detA;
double result;
detA= ib*ib -4*ia*ic;
if(detA<0.0)
return "Real Roots not possible";
else {
result= -ib - Math.sqrt(detA/(2 * ia));
Double Dresult=new Double (result);
return Dresult.toString( );
public String getDx2( ) {
double detA;
double result;
detA= ib*ib -4*ia*ic;
if(detA<0.0)
return "Real Roots not possible";
else {
result= -ib + Math.sqrt(detA/(2 * ia));
Double Dresult=new Double (result);
return Dresult.toString( );
my directory structure is given below:
C:\tomcat-5.0.28\jakarta-tomcat-5.0.28\webapps\jsp-examples\WEB-INF\classes\com\
brainysoftware>dir
Volume in drive C has no label.
Volume Serial Number is 4C50-9542
Directory of C:\tomcat-5.0.28\jakarta-tomcat-5.0.28\webapps\jsp-examples\WEB-IN
F\classes\com\brainysoftware
05/22/2005 11:15 PM <DIR> .
05/22/2005 11:15 PM <DIR> ..
05/22/2005 11:18 PM 134 CalculatorBean.java
05/23/2005 12:12 AM 216 Counter.java
05/24/2005 10:48 PM 358 SimpleJavaBean.java
06/14/2005 11:16 PM 1,205 Calculator.java
06/14/2005 11:16 PM 1,323 Calculator.class
06/16/2005 06:44 PM 534 CalculatorBean2.java
06/17/2005 08:53 AM 703 CalculatorBean2.class
06/16/2005 07:00 PM 352 CalculatorBean2.html
06/17/2005 08:51 AM 588 CalculatorBean2.jsp
06/17/2005 04:29 PM 97 UploadBean.java
06/17/2005 04:43 PM 527 FileUploadBean.java
06/17/2005 04:43 PM 834 FileUploadBean.class
06/18/2005 12:21 PM 863 Quadratic.java
06/18/2005 12:21 PM 1,093 Quadratic.class
14 File(s) 8,827 bytes
2 Dir(s) 8,615,821,312 bytes free
C:\tomcat-5.0.28\jakarta-tomcat-5.0.28\webapps\jsp-examples\WEB-INF\classes\com\
brainysoftware>
The above clearly shows the presence of Bean in the reqd directory but still I am getting an error. Can somebody help me:
Zulfi.

class QuadraticThe class is not public. It is only visible to other classes in the same package as itself, so the servlet (JSP) trying to instantiate and reference it can't see it.
Make it public.

NEWBIE SUPER EASY JSP / BEAN

With about half a dozen books sitting around my desk, I can't get a REAL basic jsp to work. I FINALLY got tomcat to NOT give run time errors, however the web page simply outputs "This is output:" I know I am an idiot, but this JSP / bean stuff is upsetting. Any help on the following code would be great.
basic.jsp is as follows:
<jsp:useBean id="myBean" class="basic.basicbean" scope="session"/>
<html>
<head>
<title>
A Simple JSP
</title>
</head>
<body>
<%
myBean.setBasicName("Michelle");
%>
This is output: <% myBean.getBasicName();%>
</body>
</html>
basicbean.java is as follows:
package basic;
import java.beans.*;
public class basicbean {
private String BasicName=null;
/** Creates new basicbean */
public basicbean() {}
public String getBasicName() {
return this.BasicName;
public void setBasicName(String value) {
this.BasicName = value;
Made the .java into the class put it in the basic directory under the classes/basic directory of the WEB-INF. The JSP page loads, but only output is: "This is output:" I am using Tomcat as the JSP server. "Core JSP" "Core Servlets and JavaServer Pages" "Advanced JavaServer Pages" "JSP, Servlets, and MySQL", and "Java Server Pages for Dummies" and I still can't get it. Thanks for helping out an idiot.
-Jim

You are very close; just a small error in the line:
This is output: <% myBean.getBasicName();%>
The problem is your just simply calling the method and tossing the return value. You have three ways of outputing the bean property:
This is output: <% out.print(myBean.getBasicName();%>
or
This is output: <%=myBean.getBasicName()%>
or
This is output: <jsp:getProperty name="myBean" property="BasicName" />
If you use the <jsp:getProperty> approach, then you must have a <jsp:useBean> somewhere above the getProperty tag.
- Chris

Redundant information in JSP bean action

Class Person:
public class Person{
private String name;
public void setName(String p){
name=p;
public String getName(){
return name;
}Code in servlet:
public void doPost(HTTPServletRequest request, HTTPServletResponse response) throws IOException,ServletException{
foo.Person p= new foo.Person();
p.setName("New Guy");
request.setAttribute("person",p);
RequestDispatcher view = request.getRequestDispatcher("result.jsp");
view.forward(request,response);
}Code in JSP:
<jsp:useBean id="person" class="foo.Person" scope="request">This jsp:useBean tag really is confusing. Why does it need to declare the class="foo.Person"? Why does the JSP need to know that "person" instance is derived from class foo.Person ? (I wonder if I changed this to foo.person --> not Person will result in error). Doesn't the statement request.setAttribute("person",p) from the servlet give enough info already to the JSP? thanks

The "person" in your servlet has nothing to do with your "person" in your JSP bean tag.

Create jsp/bean webapp deploy fine... add JSTL library wont deploy!

winxp
SJSE8
PROBLEM:
Using the new project wizard, I create a simple jsp/bean webapp using the embedded tomcat 5.5.7 as server... It deploys and runs with now issue
Then, I right-click on project name (in project tree)... click properties... add library... select "JSTL 1.1".... do clean/build.... do deploy - which fails!
message is: "Failed to deploy application at context path /bcd" (where bcd is my project name)
Why does this happen?
--------------simple app---------------
***jsp1.jsp****
<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<!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=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
    <h1>JSP Page</h1>
    <h1>get stuff JSP Page</h1>
    <jsp:useBean id="a" class="bcdpkg.IndexBean" scope="request"/>
    <h3>after1...</h3>
    
    <jsp:getProperty name="a" property="stuff" />
    </body>
</html>***IndexBean.java***
package bcdpkg;
public class IndexBean
    /** Creates a new instance of IndexBean */
    public IndexBean()
    private String stuff = "this is stuff";
    public String getStuff()
        return this.stuff;
    public void setStuff(String s)
        this.stuff = s;
}

well.... I restarted SJSE8 (and tomcat 5.5.7) and now I can right-click on the project and click deploy...successfully.
(Apologies for the "hair trigger" posting)
I'll reply once more if it happens again.
thanx

Redirect from jsp bean to jsp or html page

I am facing a problem in redirecting to a jsp page from jsp bean
How do i redirect from jsp bean to any other page like jsp or html.
[email protected]

Hi
The solution you suggested we tried it long before only but it is not feasible for us as we have to implement it in all web pages which are in thousands.
My need is like this.
We have given specific time to each of our registered user , as user logs to our portal we calculate session time in bean and as he logs out is new time gets updated. (its like dial up connection)
Now what happens consider user has left only 10 minutes balance, I can calculate and keep track for his time in bean.Now as the time becomes zero I want to redirect him to home page.
As u said i can get return value zero for bean and can do it ,but our webpages are near about thousands.

Javascript array / jsp Bean Collection

How can you fill a javascript array with the values of the collection?
<jsp:useBean id="programs" scope="request" class="java.util.Collection"/>
How can I create this array?
<script language="JavaScript" type="text/javascript">
var programData =
new Array ( new Array "${programs[1].programId}","${programs[1].programName}", "${programs[1].department}"),
             new Array "${programs[2].programId}","${programs[2].programName}", "${programs[2].department}"),
</script>

I answered myself. If anyone else would like to know how to fill a javascript array with the values of a jsp beans collection.
function collectionToArray()
Array[rows] = [4];
var cnt = 0;
<c:forEach var="sp" items="${programs}">
rows[cnt][0] = ${sp.programId};
rows[cnt][1] = ${sp.programName};
rows[cnt][2] = ${sp.department};
rows[cnt][3] = ${sp.urlLink1};
rows[cnt][4] = ${sp.urlLink2};
cnt++;
</c:forEach>
}

Jsp bean property method dilemma

Hi all,
I'm just starting using bean and trying to convert old jsp in MVC model using beans. I expose the problem:
a simple internal search engine ask with a form to enter the some parameter. I want to use this parameter to compose my query to the db.
Now I use this code in my jsp to make the query:
boolean firstTime = true;
Hashtable hshTable = new Hashtable(10);
Enumeration enumParam = request.getParameterNames();
while (enumParam.hasMoreElements())
String name = (String)enumParam.nextElement();
   String sValore = request.getParameter(name);
   if (!sValore.equals(""))
    hshTable.put(name, new String(sValore));
Enumeration enumHshTable = hshTable.keys();
while (enumHshTable.hasMoreElements())
String str_SelectStatement = "SELECT * FROM myTable";
/*If isn't my first time don't add WHERE but AND*/
if (firstTime)
   str_SelectStatement += " WHERE (";
   firstTime = false;
else
   str_SelectStatement +=" AND (";
String sKey = (String)enumHshTable.nextElement();
   str_SelectStatement += sKey + " LIKE '" + (String)hshTable.get(sKey) + "%')";
}In this way I compose a smart query like this:
SELECT * FROM myTable WHERE param1 LIKE 'param1Value' AND param2 LIKE 'param2Value' AND........
How to convert it in a bean model?
If I make n setXxxx() getXxxx() I loss in reuse of code.
If I make personalized setXxxx() for the param1 how can I access to the name of the current method?
I need this to compose my query. I can retrive the param1Value but not the current name (param1) of the parameter.
import java.sql.*;
import java.io.*;
public class DbBean
String Param1;
ResultSet r = null;
boolean firstTime = true;
String str_SelectStatement = "SELECT * FROM myTable";
public DbBean()
super();
public String getParam1() throws SQLException
this.Param1 = r.getString("Param1")!=null?r.getString("Param1"):"";
return this.Param1;
public void setParam1(String param1Value)
if (firstTime)
   str_SelectStatement += " WHERE (";
   firstTime = false;
else
   str_SelectStatement +=" AND (";
str_SelectStatement += NameOfTheMethod... + " LIKE '" + param1Value;
this.Param1= newValue;
}How can I take the NameOfTheMethod... Param1?
I search around and I read that you can access to the Method name in the stack trace in an other method. But I can't belive this is THE way. It is no suitable.
Any suggestion will be greatly appreciated.
Thank you

Hiya Ejmade,
First of all: you're missing the concept of the MVC (Model - View - Controller) model. There are two (2) versions out there, with the currently pending (no. 2) going like this:
from a resource, a JSP page acquires a java bean, encapsulating the data. Via set/get methods of the bean, you create content on the JSP page
If you wanted to comprise your search engine like this, you would first have to create a file search.jsp (can be .html at this point) which would call a SearchServlet. This servlet would perform a query, encapsulate the data in some object (let's say java.sql.ResultSet) and then forward control to a JSP page, including the object. The page would acquire the object (through the session context, for instance), extract data, and make it available on the site.
But that's not what's puzzleing you. You would like to know which method created the database query string so you could adapt that very string. This can be done with the class introspection API, reflection. It's quite complex, you'll need to read about it in a tutorial, try:
http://java.sun.com/tutorial
The reflection API has quite a lot of overhead and it, honestly speaking, does not have to be used here. Instead, try this:
public class DBean {
Hashtable queryParamters;
public DBean(Hashtable queryParameters) {
this.queryParameters = queryParameters;
public String generateSQLCode() {
StringBuffer call = new StringBuffer("SELECT * FROM myTable WHERE ");
for (Enumeration e = queryParameters.keys(); e.hasMoreElements();) {
   String key = (String)e.nextElement();
   call.append(key + " LIKE " + (String)queryParameters.get(key));
return(call.toString());
}This code should generate the string for you (with minor adjusments). Btw, I noticed some basic mistakes in the code (calling the Object() constructor, for instance, which is not neccessary). Do pick up a good java book ..
Hope this helps,
-ike, .si

Calling JSP bean function on button OnClick

Hi-
A NewBie question....
I have a .jsp page and supporting .java bean.
I registed the bean in .jsp page using <jsp:useBean ...>
I want to fire a function defined in that bean on the click of a button which is defined in the .jsp page
So I am doing something like this... seems like not the correct way to do since it fires this script all the time, not just when the button is clicked.
<input name='click1' type='Submit' value='Click1' onClick='<% testBean.click1Clicked (); %>'/>
Thanks for your help.

Hi Kishor-
Thanks for the reply.
I realize that might be the case, as u explained in your two points.
so now I have created a hidden input field and use it's value as a way to communicate between javascript and jsp. and in bean's function I check the value of this hidden field, which will be set by the OnClick's javascript and then proceed accordingly.
Is this the correct way to accomplish what I am trying to?
Thanks again

Newbie - JSP & bean shopping cart logic error?

Hello,
I am attempting to bulid a shopping cart facility on a JSP site that I am building.
I am having difficulties adding an item to the basket.
The page below (bookDetail.jsp) displays items for sale from a database. At the foot of the page, I have set up a hyperlink to add an item to a basket bean instance created in this page.
What happens is the page will load correctly, when i hover the mouse over the hyperlink to add the item to the basket, the status bar shows the URL of the current page with the details of the book appended. This is what I want. But when I click the link, the page will only reload showing 20% of the content.
Netbeans throws up no errors, neither does Tomcat, so I am assuming I have made a logical error somewhere.
I have enclosed the Book class, and the ShoppingCart class for your reference.
Any help would be really appreciated as I am at a loss here.
Cheers.
Edited highlights from bookDetail.jsp
//page header importing 2 classes - Book and ShoppingCart
<%@ page import="java.util.*, java.sql.*, com.shopengine.Book, com.shopengine.ShoppingCart" errorPage="errorpage.jsp" %>
//declare variables to store data retrieved from database
String rs_BookDetail_bookRef = null;
String rs_BookDetail_bookTitle = null;
String rs_BookDetail_author = null;
String rs_BookDetail_price = null;
//code that retrieves recordset data, displays it, and places it in variables shown above
<%=(((rs_BookDetail_bookRef = rs_BookDetail.getString("book_ref"))==null || rs_BookDetail.wasNull())?"":rs_BookDetail_bookRef)%>
<%=(((rs_BookDetail_author = rs_BookDetail.getString("author"))==null || rs_BookDetail.wasNull())?"":rs_BookDetail_author)%>
<%=(((rs_BookDetail_bookTitle = rs_BookDetail.getString("book_title"))==null || rs_BookDetail.wasNull())?"":rs_BookDetail_bookTitle)%>
<%=(((rs_BookDetail_price = rs_BookDetail.getString("price"))==null || rs_BookDetail.wasNull())?"":rs_BookDetail_price)%>
//this link is to THIS PAGE to send data to server as request parameters in Key/Value pairs
// this facilitates the add to basket function
<a href="<%= response.encodeURL(bookDetail.jsp?title=
"+rs_BookDetail_bookTitle+"
&item_id=
"+rs_BookDetail_bookRef +"
&author="+rs_BookDetail_author +"
&price=
"+rs_BookDetail_price) %> ">
<img src="images\addtobasket.gif" border="0" alt="Add To Basket"></a></td>
// use a bean instance to store basket items
<jsp:useBean id="basket" class="ShoppingCart" scope="session"/>
<% String title = request.getParameter("title");
if(title!=null)
String item_id = request.getParameter("item_id");
double price = Double.parseDouble(request.getParameter("price"));
Book item = new Book(item_id, title, author, price);
basket.addToBasket( item );
%>
ShoppingCart class that is used as a bean in bookDetail.jsp shown above
package com.shopengine;
//import packages
import java.util.*;
//does not declare explicit constructor which automatically creates a zero argument constructor
//as this class will be instantiated as a bean
public class ShoppingCart
//using private instance variables as per JavaBean api
     private Vector basket;
     public ShoppingCart()
          basket = new Vector();
     }//close constructor
//add object to vector
     public void addToBasket (Book book)
          basket.addElement(book);
     }//close addToBasket method
//if strings are equal, delete object from vector
     public void deleteFromBasket (String foo)
for(Enumeration enum = getBasketContents();
enum.hasMoreElements();)
//enumerate elements in vector
Book item = (Book)enum.nextElement();
//if BookRef is equal to Ref of item for deletion
//then delete object from vector.
if (item.getBookRef().equals(foo))
basket.removeElement(item);
break;
}//close if statement
}//close for loop
     }//close deleteFromBasket method
//overwrite vector with new empty vector for next customer
     public void emptyBasket()
basket = new Vector();
     }//close emptyBasket method
     //return size of vector to show how many items it contains
public int getSizeOfBasket()
return basket.size();
     }//close getSizeOfBasket method
//return objects stored in Vector
     public Enumeration getBasketContents()
return basket.elements();
     }//close getBasketContents method
     public double getTotalPrice()
//collect book objects using getBasketContents method
Enumeration enum = getBasketContents();
//instantiate variable to accrue billng total for each enummeration
double totalBillAmount;
//instantiate object to store data for each enummeration
Book item;
//create a loop to add up the total cost of items in basket
for (totalBillAmount=0.0D; enum.hasMoreElements(); totalBillAmount += item.getPrice())
item = (Book)enum.nextElement();
}//close for loop
return totalBillAmount;
     }//close getTotalPrice method
}//close shopping cart class
Book Class that is used as an object model for items stored in basket
package com.shopengine;
import java.util.*;
public class Book{
     //define variables
private String bookRef, bookTitle, author;
     private double price;
//define class
public Book(String bookRef, String bookTitle, String author, double price)
this.bookRef= bookRef;
this.bookTitle=bookTitle;
this.author=author;
this.price=price;
//create accessor methods
     public String getBookRef()
          return this.bookRef;
     public String getBookTitle()
          return this.bookTitle;
     public String getAuthor()
          return this.author;
     public double getPrice()
          return this.price;
}//close class

page will only reload showing 20% of the content.Im building some carts too and I had a similiar problem getting null values from the mysql database. Are you getting null values or are they just not showing up or what?
On one of the carts I'm building I have a similiar class to yours called products that I cast onto a hashmap works alot better. Mine looks like this, maybe this is no help I don't know.......
public class Product {
    /**An Item that is for sale.*/
      private String productID = "Missing";
      private String categoryID = "Missing";
      private String modelNumber = "Missing";
      private String modelName = "Missing";
      private String productImage = "Missing";
      private double unitCost;
      private String description = "Missing";
      public Product(
                       String productID,
                       String categoryID,
                       String modelNumber,
                       String modelName,
                       String productImage,
                       double unitCost,
                       String description) {
                       setProductID(productID);
                       setCategoryID(categoryID);
                       setModelNumber(modelNumber);
                       setModelName(modelName);
                       setProductImage(productImage);
                       setUnitCost(unitCost);
                       setDescription(description);
      public String getProductID(){
         return(productID);
      private void setProductID(String productID){
         this.productID = productID;
      public String getCategoryID(){
         return(categoryID);
      private void setCategoryID(String categoryID){
         this.categoryID = categoryID;
      public String getModelNumber(){
         return(modelNumber);
      private void setModelNumber(String modelNumber){
         this.modelNumber = modelNumber;
      public String getModelName(){
         return(modelName);
      private void setModelName(String modelName){
         this.modelName = modelName;
      public String getProductImage(){
         return(productImage);
      private void setProductImage(String productImage){
         this.productImage = productImage;
      public double getUnitCost(){
          return(unitCost);
      private void setUnitCost(double unitCost){
          this.unitCost = unitCost;
      public String getDescription(){
          return(description);
      private void setDescription(String description){
          this.description = description;

Using JSP-Beans in Apache

Hi all!
I'm trying to deploy a jsp page in Tomcat 4.1.19. This page uses Java Beans to set and get various properties. I've put the class file of Java Bean in WEB-INF/classes directory and jsp page in Dir root. But whenever I run the jsp page it shows error page saying the bean name as unresolved symbol.
Please tell me the steps that are involved in setting up a Java Bean for jsp in tomcat and also if any special lines are needed to be added to Deployment Descriptor.
Thanx
Varun

sorry for tha :) maybe my english sucks to much...
here's what sun says:
"Note: In the section JSP Scripting Elements we mentioned that you must import any classes and packages used by a JSP page. This rule is slightly altered if the class is only referenced by useBean elements. In these cases,
---***you must only import the class if the class is in the unnamed package***---.
For example, in What Is a JSP Page? (page 246), the page index.jsp imports the MyLocales class. However, in the Duke's Bookstore example, all classes are contained in packages and thus are not explicitly imported."
as mentioned here:
http://java.sun.com/j2ee/tutorial/1_3-fcs/doc/JSPBeans4.html#64054

Error while using Jsp Beans

Hi, i just have written my first bean but i'm getting this erro message:
java.lang.ClassNotFoundException: Unable to load class userinfo.FormBean
Can somebody pls help me out.
Thanks in advance
JBP
Below are my codes for the bean and my jsp codes
Bean:
package userinfo;
import java.io.*;
public class FormBean implements Serializable
private String name;
private String email;
public FormBean()
name = "test";
email = "test";
public void setName(String name)
this.name = name;
public String getName()
return name;
public void setEmail(String email)
this.email = email;
public String getEmail()
return email;
Jsp Codes:
<html>
<head>
<title>Login</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<jsp:useBean id="formbean" class="userinfo.FormBean"/>
<jsp:setProperty name="formbean" property="*" />
<body bgcolor="#FFFFFF" text="#000000">
<% if (request.getParameter("name")==null
&& request.getParameter("email"==null)
{ %>
<form name="form1" method="post" action="process.jsp">
Name:
<input type="text" name="textfield">
<br>
<br>
Email:
<input type="text" name="textfield2">
<br>
<br>
<input type="submit" name="Submit" value="Process">
</form>
<% } else {%>
<p>
<b>you have provided the following info</b>
<p>
<b>Name</b>:<jsp:getProperty name="formbean" property="name"/>
<p>
<b>Email</b>:<jsp:getProperty name="formbean" property="email"/>
<p>
<%}%>
</body>
</html>

Hi!
I tried ur bean in my program on javawebserver.
It didn't work.
gave error:
java.lang.ClassNotFoundException: Unable to load class userinfo.FormBean
then I just added
import java.io.Serializable;
in ur bean and tried.
It gave me error:
D:\JavaWebServer2.0\tmpdir\default\pagecompile\jsp\_examples\_jsp\_samples\_Brand__new\_mail1.java:19: '}' expected.
static char[][] jspxhtml_data = null;
I think the problem with bean is solved.
U check for the same.
check the settings of server and classpath .
write whether it works,
bye,
Samir

Jsp bean:setvalue problem

i use bean in my jsp page.but the problem is that i didn't get the value.i doubt whether the value actully passed to data.my bean is follows:
package abc;
public class hai
private int a;
public void sethai(int x)
a=x;
public int gethai()
     return a;
my files are as follows
1) simple.html
<html>
<head>
</head>
<body>
<form action="simple1.jsp" method="post" name="form1" target="_self">
Number:<input name="num" type="text"><br>
<input name="sub" type="submit" value="sub"></form>
</body>
</html>
2)simple1.jsp
<html>
<head></head>
<%@ page import="abc.*" errorPage="" %>
<jsp:useBean id="obj" class="abc.hai" scope="session">
<jsp:setProperty name="obj" property="*"/>
</jsp:useBean>
<% out.println(request.getParameter("num"));%>
<body>number:
<jsp:getProperty name="obj" property="hai" />
</body>
</html>
the output i got is the value 0
pls replay me

Hi Marty,
Here is my portalapp.xml file:
<?xml version="1.0" encoding="utf-8"?>
<application>
<application-config>
    <property name="PrivateSharingReference" value="com.sap.portal.htmlb"/>
    <property name="SharingReference" value="htmlb"/>
</application-config>
<components>
    <component name="DynPageOne">
      <component-config>
        <property name="ClassName" value="com.mycompany.basicexample.DynPageOne"/>
        <property name="SecurityZone" value="com.mycompany.basicexample.DynPageOne/low_safety"/>
      </component-config>
      <component-profile>
        <property name="tagLib" value="/SERVICE/htmlb/taglib/htmlb.tld"/>
        <property name="com.sap.portal.reserved.iview.IsolationMode" value="URL"/>
      </component-profile>
    </component>
</components>
<services/>
</application>
I also created a getter method in my bean to return a static value and that value is returned correctly. Any more ideas?

Jsp beans problem

hi all i have some trouble ...
i`m making a register form in jsp and i want to put the data into bean and then retrieve the data in a servlet
in the jsp i have:
<jsp:useBean id="data" class="DataBean">
<jsp:setProperty name="data" property="*"/>
</jsp:useBean>
<form method=post action="/SubmitServlet">
<input type=text name="message">
<input type=submit value="submit">
</form>
in the bean i have:
private String message = null;
public String getMessage() {
return message;
public void setMessage(String string) {
message = string;
and in the servlet:
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
HttpSession session = req.getSession();
     DataBean adr = (DataBean)session.getAttribute("data");
     if (adr==null) {
          System.out.println("ada");
     else {
     System.out.println(adr.getMessage());
.... and the server prints me the null string ... so the bean is not updated when i`m submiting the information from the jsp to the servlet ....
how could i make it right?

Oh, I see, when you said 'the Servlet prints the null string', you meant it gets to this line:
System.out.println(adr.getMessage());
and prints "null", right?
Well, that is because you never set the message. The way your JSP works:
1) Create a DataBean and store it in session (are there paramameters? no, so don't call any set methods)
2) Display a Form.
Then when the User presses the submit button, you have an action set to the Servlet /SubmitServlet, not back to the JSP. So, the Servlet has to handle the parameters passed from the form, not JSP. The JSP is done after it displays the page.
public void doPost(...) ...
HttpSession session = req.getSession();
DataBean adr = (DataBean)session.getAttribute("data");
if (adr==null) {
    adr = new DataBean();
    session.setAttribute("data", adr);
String message = req.getParameter("message");
adr.setMessage(message);
System.out.println("The Message Is: "+message);
//Maybe do a forward?? or some display??
}If you want the JSP to handle the parameters sent by the form, then you will have to make the form's action set to the same address, not to the servlet (see my message in the first reply about how to make sure the setProperty gets called...)

JSP, BEANS AND DAO best practice... (and a little of STRUTS & JSTL)

Hi,
Want to get your opinion on how to really use bean and dao in jsp pages.
Imagine that you wants to display a news list on the jsp index page for example.
You've got a dao with method getLastNews(int size) which returns a Collection of News beans. Then with jstl or struts you iterate ove the collection to display the news in a formatted way.
Easy to build collection with scriptlets & co but not very clean...
What is the best way to call my dao and its method with a tag whithout using scriplets ?
Thanks

Yes this is the solution i use when the collection is displayed alone in a jsp page, but how do you do this when you include this collection in a page, and if you have other collections in other parts of the page ? Is there a clean solution of doing this in the jsp page? For example:
<sometag:loadmycollection name="list"/>
<logic:iterate id="myCollectionElement" name="list">
Element Value: <bean:write name="myCollectionElement" />
</logic:iterate>
I know that i can write my own tag by if there is an existing solution...

Jsp Bean

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