Using beans with jsp

Hi
i am using tomcat 6.0 and jdk 1.6u17
i am trying to use a bean to connect to MySql db using jsp page but i keep getting the error :
org.apache.jasper.JasperException: org.apache.jasper.JasperException: Unable to load class for JSP
i read about it and i think that it is unable to locate my bean class file
here is the beanDb.java
package beans;
import java.sql.;
import java.io.;
public class beanDb
private Connection dbCon;
String path="jdbc:mysql://localhost:3306/dbname?user=username&password=pwd";
String dbDriver="com.mysql.jdbc.Driver";
public beanDb()
super();
public boolean connect() throws ClassNotFoundException,SQLException
Class.forName(dbDriver);
dbCon = DriverManager.getConnection(path);
return true;
public void close() throws SQLException
dbCon.close();
public void path()
public ResultSet execSQL(String sql) throws SQLException
Statement s = dbCon.createStatement();
ResultSet r = s.executeQuery(sql);
return (r == null) ? null : r;
public int updateSQL(String sql) throws SQLException
Statement s = dbCon.createStatement();
int r = s.executeUpdate(sql);
return (r == 0) ? 0 : r;
and the jsptest.jsp code is :
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<jsp:useBean id="beanDb" class="beanDb" scope="request" />
<!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>Untitled Document</title>
</head>
<body>
<%
out.println(beanDb.connect());
%>
</body>
</html>
the location of these files are :
C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\myApp\WEB-INF\classes\beans\beanDb.java
C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\myApp\jsptest.jsp
Please suggest a solution..
Thanks

http://forums.sun.com/thread.jspa?threadID=5423314

Similar Messages

Using beans with jsp without any ide

Hi
i am using tomcat 6.0 and jdk 1.6u17
i am trying to use a bean to connect to MySql db using jsp page but i keep getting the error :
org.apache.jasper.JasperException: org.apache.jasper.JasperException: Unable to load class for JSP
i read about it and i think that it is unable to locate my bean class file
here is the beanDb.java
package beans;
import java.sql.*;
import java.io.*;
public class beanDb
     private Connection dbCon;
     String path="jdbc:mysql://localhost:3306/dbname?user=username&password=pwd";
     String dbDriver="com.mysql.jdbc.Driver";
     public beanDb()
          super();
     public boolean connect() throws ClassNotFoundException,SQLException
Class.forName(dbDriver);
dbCon = DriverManager.getConnection(path);
return true;
     public void close() throws SQLException
     dbCon.close();
     public void path()
     public ResultSet execSQL(String sql) throws SQLException
          Statement s = dbCon.createStatement();
ResultSet r = s.executeQuery(sql);
return (r == null) ? null : r;
     public int updateSQL(String sql) throws SQLException
     Statement s = dbCon.createStatement();
int r = s.executeUpdate(sql);
return (r == 0) ? 0 : r;
and the jsptest.jsp code is :
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<jsp:useBean id="beanDb" class="beanDb" scope="request" />
<!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>Untitled Document</title>
</head>
<body>
<%
               out.println(beanDb.connect());
               Connection connection;
               Statement stmt = null;
               ResultSet rs = null;
%>
</body>
</html>
the location of these files are :
C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\ROOT\myApp\WEB-INF\classes\beans\beanDb.java
C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\ROOT\myApp\jsptest.jsp
Please suggest a solution..
Thanks

here is the changed code but still the same error:
package beans;
import java.sql.;
import java.io.;
public class beanDb
private Connection dbCon;
String path="jdbc:mysql://localhost:3306/dbname?user=username&password=pwd";
String dbDriver="com.mysql.jdbc.Driver";
public beanDb()
super();
public boolean connect() throws ClassNotFoundException,SQLException
Class.forName(dbDriver);
dbCon = DriverManager.getConnection(path);
return true;
public void close() throws SQLException
dbCon.close();
public void path()
public ResultSet execSQL(String sql) throws SQLException
Statement s = dbCon.createStatement();
ResultSet r = s.executeQuery(sql);
return (r == null) ? null : r;
public int updateSQL(String sql) throws SQLException
Statement s = dbCon.createStatement();
int r = s.executeUpdate(sql);
return (r == 0) ? 0 : r;
and the jsptest.jsp code is :
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<jsp:useBean id="beanDb" class="beanDb" scope="request" />
<!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>Untitled Document</title>
</head>
<body>
<%
out.println(beanDb.connect());
%>
</body>
</html>
the location of these files are :
C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\myApp\WEB-INF\classes\beans\beanDb.java
C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\myApp\jsptest.jsp

Using java bean with jsp

hello friends,
i'm new to jsp. i want to create an html form that accepts username and a value from four radio buttons and display back the entered name and checked radio button's value using java bean.
i use the <jsp:setProperty id="" property="*"> method. i don't know how to access the radio buttons value from the html.
also when i use an additional field other than username the jsp page is showing error.
Please give me the correct method to use java bean with jsp in this circumstance.
thank you.

thank you, but i have a problem left. the case is like this.
i got the jsp and bean worked fine when i have a sinle input text field.
but when i added a second text field i recieved the following error.
javax.servlet.ServletException: basket.newbean.getUserPass()Ljava/lang/String;
     org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:825)
     org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)
     org.apache.jsp.newform.process_jsp._jspService(process_jsp.java:69)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
where userPass is the new form element. I have made the subsequent chanes in my bean program and jsp file.
pls hlp.

Error while using Beans in JSP

I am using netbeans to develop the applications and am using tomcat version (jakarta-tomcat-4.1.18).
When I execute the following program i get the below mentioned error::
StringBean.java
package test;
import java.beans.*;
public class StringBean {
private String message = "No message SPECIFIED";
public String getMessage() {
return message;
public void setMessage(String message) {
this.message = message;
StringBean.jsp
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE>Using JavaBeans with JSP </TITLE>
<LINK REL=STYLESHEET HREF="JSP-Styles.css" TYPE="text/css" >
</HEAD>
<body
<jsp:useBean id = "SB" class = "test.StringBean" />
initial value is : <jsp:getProperty name = "SB" property= "message"/>
<jsp:setProperty name= "SB" property = "message" value= "this the message after the change"/>
final value is :<jsp:getProperty name = "SB" property= "message"/>
</body>
</HTML>
javax.servlet.ServletException: test/StringBean
at org.netbeans.modules.tomcat.tomcat40.runtime.IDEJspServlet.service(IDEJspServlet.java:349)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2347)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:468)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1027)
     at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1125)
     at java.lang.Thread.run(Thread.java:536)
Root Cause
java.lang.NoClassDefFoundError: test/StringBean
     at java.lang.Class.getDeclaredConstructors0(Native Method)
     at java.lang.Class.privateGetDeclaredConstructors(Class.java:1590)
     at java.lang.Class.getConstructor0(Class.java:1762)
     at java.lang.Class.newInstance0(Class.java:276)
     at java.lang.Class.newInstance(Class.java:259)
at org.netbeans.modules.tomcat.tomcat40.runtime.IDEJspServlet$JspServletWrapper.load(IDEJspServlet.java:106)
     at org.netbeans.modules.tomcat.tomcat40.runtime.IDEJspServlet$JspServletWrapper.loadIfNecessary(IDEJspServlet.java:150)
     at org.netbeans.modules.tomcat.tomcat40.runtime.IDEJspServlet$JspServletWrapper.service(IDEJspServlet.java:160)
     at org.netbeans.modules.tomcat.tomcat40.runtime.IDEJspServlet.serviceJspFile(IDEJspServlet.java:246)
     at org.netbeans.modules.tomcat.tomcat40.runtime.IDEJspServlet.service(IDEJspServlet.java:339)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2347)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:468)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1027)
     at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1125)
     at java.lang.Thread.run(Thread.java:536)

Ok The class isn't found, so your classpath settings of netbeans (if you are using the run function in netbeans) isn't set.
and if you aren't using netbeans to run it, then the class isn't in the webapp/WEB-INF/classes
good luck

Help me!! How to use JavaScript with JSP ??

I am using JDeveloper and I created a screen in JSP which uses a bean for database connectivity and retriving info onto the page.
The page has a ListBox where list items are populated from the database.My requirement is
whenever the list is changed the page shuold be refreshed with the selected item info.
I tried to use 'JavaScript' for triggering the event with 'onChange' event of the ListBox.But the event is not getting invoked. I think JavaScript is not working with JSP.
Please help me with how to Use javaScript with JSP or any other alternative where I can meet my requirement.
I have one more question...I have gone through the JSP samples in OTN and I am trying do download the sample 'Travel servlet' which show list of countries...etc
I have also gone through the 'readme' but I don't know how to extract .jar file.
I would be great if you could help me in this.
Thanks!!
Geeta
null

We have a similar need. We have used Cold Fusion to display data from Our Oracle Database. We have a simple SElect Box in HTML populated with the oracle data. When someone selects say the State of Pennsylvania. then we have an On change event that runs a Javascript to go get all the cities in Pennsylvania.
Proble we are having is that inorder for the Javascript to work , we currently have to send all the valid data.
Do you know of any way to dynamically query the the Oracle database in Javascript

Using Beans in jsp

hi all,
i am using bean in my jsp page.but it is not working it shows error. i have run this with even Tomcat or WebLogic. even i have just Copy paste code from net.
the code is
index.jsp
<%@ page errorPage="errorpage.jsp" %>
<jsp:useBean id="counter" scope="session" class="beans.Counter" />
<html>
<head>
<title>Session Bean Example 1</title>
</head>
<body>
<H3>Session Bean Example 1</H3>
<center><b>The current count for the counter bean is: </b>
<%=counter.getCount() %></center>
</body>
</html>
Bean -Counter.java
package beans;
import java.io.Serializable;
public class Counter implements Serializable{
int count = 0;
public Counter(){
public int getCount() {
count++;
return this.count;
public void setCount(int count) {
this.count = count;
and error on browser is
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: /index.jsp(3,0) The value for the useBean class attribute beans.Counter is invalid.
     org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:512)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
org.apache.jasper.JasperException: /index.jsp(3,0) The value for the useBean class attribute beans.Counter is invalid.
     org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:39)
     org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:405)
     org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:146)
     org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1174)
     org.apache.jasper.compiler.Node$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:3320)
     org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:198)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:295)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:276)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:264)
     org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:305)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.20 logs.
Please let me know how can i handle this situation

Try this
After<hsp:useBean>
<jsp:setProperty name="counter" property="setCounter" value=1 />
<jsp:getProperty name="counter" property="getCounter" />

Java.lang.NoSuchMethodError using beans and JSP

Hi,
I get a
java.lang.NoSuchMethodError: Unit.UnitBean.execSQL(Ljava/lang/String; Ljava/sql/ResultSet;
when i try to call that method from my jsp page. I can call all other methods in teh bean but I can't understand why it can't find execSQL when it finds every thing else.
Any help would be greatly appreciated.
Mike
Heres a copy of my java bean code:
package Unit;
import java.sql.*;
import java.io.*;
public class UnitBean
     Connection con;
     String error;
     public boolean connect() throws ClassNotFoundException,SQLException
          String StudentNumber = "xxx";
          String strHost = "xxxx";
          String strConnectURL = ("jdbc:postgresql://" + strHost + "/");
          String strUser = "xxxx";
          String strPassword = "xxxxx";
          Class.forName("org.postgresql.Driver");
          con = DriverManager.getConnection(strConnectURL, strUser, strPassword);
          return true;
     public void disconnect() throws SQLException
          con.close();
     public ResultSet execSQL(String sql)throws SQLException
          Statement s = con.createStatement();
          ResultSet rs = s.executeQuery(sql);
          return rs;
     public String test()
          String Mike="HIHIHIHIHI";
          return Mike;
}And the jsp code:
<%@ page language="java" contentType="text/html"%>
<%@ page import="java.sql.*" %>
<%@ page import="java.io.*" %>
<jsp:useBean id="Unit" class="Unit.UnitBean" scope="page"/>
<html>
     <head>
          <title>Test My Bean!!!!???!!?!</title>
     </head>
     <body>
          <%
               String SQL ="Select * from unit where unitid='CMPS2B26'";
               ResultSet rs =null;
               try
                    Unit.connect();
                    rs = Unit.execSQL(SQL);
                    while(rs.next())
                              out.println(rs.getString("unitid"));
                    Unit.disconnect();
               catch(Exception e)
                    out.println("<p>Problem with jsp code" +e);
          %>
          This is a jsp page.
          <p><a href = "http://stuweb3.cmp.uea.ac.uk/~xxxx/index.html">Click here for home page</a>
     </body>
</html>

Yeah, that worked great, thanks a lot. I thought that JSP compiled when you changed it and then visited it, but i've tried that. I just ran ant stop start on my server and it's all working.
Thanks again :)
Mike

Using JARs with JSP?

How do you include JARs in a classpath so that the classes inside can be referred to in <%@ page import="mypackageinajar.myclassinajar" %> ? I've looked through the JSP docs but it only covered import statements. If I can't use a JAR, how would I enable my program to access the class files that I could just manually extract from the JAR?
Thanks

How do you include JARs in a classpath so that the
classes inside can be referred to in <%@ page
import="mypackageinajar.myclassinajar" %> ? I've
looked through the JSP docs but it only covered
import statements. If I can't use a JAR, how would I
enable my program to access the class files that I
could just manually extract from the JAR?You can use JARs, but this is simply a question of how to pack your stuff into a WAR. It has nothing really to do with JSPs...
http://java.sun.com/j2ee/tutorial/1_3-fcs/doc/WebComponents3.html

Can anyone guide me of using LDAP with JSP?

I am a beginner in java. Plz post your answers in a simple and easy manner and explain it clearly. I am doing a project for which I require to use LDAP in JSP.

I assume he wants to use LDAP to authenticate user logon in a JSP application.
There are a few ways, JNDI being one. But a simpler method might be to see if this library works for you:
http://www.mozilla.org/directory/javasdk.html
HTH.

Unable to run beans with jsp using myeclipse

I have create jsp application with in myeclipse using following process
From the menu i create a J2EE ->WebProject
The default folder name is src which is create automatically in editor
when we create a package it will create under src folder
as i create dbconnection in src folder
The index.jsp file is in WebRoot folder .
I have use the bean dbconnection in index.jsp as described below
          <jsp:useBean id="con" scope="session" class="dbconnection.ConnectionManager"></jsp:useBean>
     <jsp:useBean id="app" scope="sesion" class="dbconnection.JspApp"></jsp:useBean>
     <jsp:setProperty name="con" property="driverClass"
          value="com.mysql.jdbc.Driver" />
     <jsp:setProperty name="con" property="connectionURL"
          value="jdbc:mysql://localhost:3306/guestbook" />
But it generate error and do not show any output There is no errors or warnings in dbconnection folder but i am unable to use it in my index.jsp page
Please help me
Thanks in advance

use cactus jar files

Problem in using java bean with jsp

Hi,
This is my code and i get this error. Not able to trace the mistake.
bean.html
<html>
<head>
<meta http-equiv="Content-Language" content="en-us">
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>Fname</title>
</head>
<body>
<form method="POST" action="http://localhost:8080/beanjsp.jsp">
     <p>Fname: <input type="text" name="T1" size="20"></p>
     <p>Lname: <input type="text" name="T2" size="20"></p>
     <p> </p>
     <p> </p>
     <p><input type="submit" value="Submit" name="B1"><input type="reset" value="Reset" name="B2"></p>
</form>
</body>
</html>
beanjsp.jsp
<jsp:useBean id="bean" class="beans.FirstBean" scope="application" />
<jsp:setProperty name="bean" property="fname" param="T1" />
<jsp:setProperty name="bean" property="lname" param="T2" />
THE FIRST NAME IS <%=bean.getFname() %>
THE LAST NAME IS <%=bean.getLname() %>
FirstBean.java
//CREATING A BEAN
package beans;
import java.io.*;
public class FirstBean
     private String fname;
     private String lname;
     FirstBean()
          fname="";
          lname="";
     public void setFname(String fn)
          fname=fn;
     public void setLname(String ln)
          lname=ln;
     public String getFname()
          return fname;
public String getLname()
          return lname;
error report
org.apache.jasper.JasperException: /beanjsp.jsp(2,0) The value for the useBean class attribute beans.FirstBean is invalid.
     org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:39)
     org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:405)
     org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:146)
     org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1223)
     org.apache.jasper.compiler.Node$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:3270)
     org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:189)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:286)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:267)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:255)
     org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:556)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:293)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)I have placed the beans package folder containing FirstBean.class inside classes folder of ROOT directory.
I don't know what s wrong with my code :( ... Plz help asap.
Thanks,
Akshatha

I have placed the beans package folder containing FirstBean.class >inside classes folder of ROOT directory.Place it in the WEB-INF/classes folder
ram.

How to use SOAP with JSP (New to SOAP)

Hi,
i had a sch assignment(a set of JSPs)............anyone know how i can go about using soap for the encoding of data ? cos i had read up some books but i'm not sure how to go about implementing it !!!!! Anyone can help me?
Regards,
khim

Hey,
Just trying to understand the assignment objective:
You have a SOAP message or some web-service that replies with SOAP messages?
You have been asked to write a JSP that (queries this web-service and) retrieves the SOAP encoded data and transform it into XHTML (by whatever method you want) using XSLT?
Is this the situation?
If it is you will need to get the DTD or XSD of the SOAP message you will be displaying. This will tell you what elements to expect, what attributes they have and their sequencing.
Then your problem is just the XSL style sheet. Here is a link if you do not kow much about XSL:
http://www.w3schools.com/xsl/default.asp
To perform the transform you can either use JSTL tags or you can use a Bean... I would suggest the JSTL tags.
I hope the advice is not too late.
Warm regards,
Darren

Using JavaBean with JSP...will not work no matter what

Hi guys. Sorry that this is such a common, newb question, but I don't know where else to turn.
I'm new to web application development, Tomcat, and JSP. I'm trying to use a simple JavaBean in a JSP to store some user information. The JSP is located in $CATALINA_HOME\webapps\art , and the UserBean I'm trying to use is in $CATALINA_HOME\webapps\art\WEB-INF\classes . I've tried adding a context in the Tomcat server.xml file, but nothing seems to work, even putting the .class file into the \art directory along with the JSP. The error I get is the following:
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 1 in the jsp file: /welcome.jsp
Generated servlet error:
[javac] Compiling 1 source file
C:\Program Files\Apache Group\Tomcat 4.1\work\Standalone\localhost\art\welcome_jsp.java:43: cannot resolve symbol
symbol : class UserBean
location: class org.apache.jsp.welcome_jsp
UserBean user = null;
^
The source code is:
welcome.jsp
<%@ page import="java.sql.*" %>
<jsp:useBean id="user" class="UserBean" scope="session"/>
<html>
<head>
<title>Art Webapp Test</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<h1>Art Site</h1><br><br>
<h3>Welcome Page</h3><br><br>
<%
     user.setUsername("joe");
user.setTitle("admin");
%>
</body>
</html>
UserBean:
public class UserBean {
private String username = null;
private String title = null;
public UserBean()
     this.username = null;
     this.title = null;
public String getUsername()
     return this.username;
public String getTitle()
     return this.title;
public void setUsername(String inName)
     this.username = inName;
public void setTitle(String inTitle)
     this.title = inTitle;
}//UserBean
Thanks for any and all help anyone could give me about this. It seems such a simple thing, to get a JavaBean working in a JSP...and it's very frustrating to have it NOT work when it seems I've done everything possible to get it to.

Ok, I figured out what the problem was. My Bean was not a part of any specific package. It was never made clear to me that Beans are required to be a part of some package...I had no idea (though they always put them in packages in the tutorials, you think I would have picked up on it!).
So I just added the following line to the Bean:
package com.art;
Then compiled it and copied the .class file to CATALINA_HOME\webapps\art\WEB-INF\classes\com\art
Ta-da
Thanks for the help and sorry for taking up space on this board.
-Matt

Use bean in jsp, please help me out

Hi all,
As a beginner in jsp I want to use a bean into my jsp page. But this bean is sourcing from a old applet (i've converted the code applet into beans code), and should return a chart (grpahics).
Here is the heart of my problem : how can i replace, call , or set up the paint method from the applet. And call it into my jsp page in order to retrieve a chart ?
Basically all applet shall have a paint method with a Graphics argument , in jsp i can't do
Mypackage.mybean.paint(Graphics g);
Hope someone will be able to help me
Thanks in advance
Shamann

I don't think that you can use the Graphics object in a JSP. A JSP is executed on the server side and only the output from that will be sent to the client. If you want to use Graphics objects etc, I think that you'll have to send it to an applet (possibly embedded in the page), but since I've never done this, I can't help you, I'm afraid.
HTH,
Raj.

Problem when using JDBC with JSP

Hi,
I am trying to display results after a database query on a JSP page, and then provide the options delete or update one of these records or to add a new one.
What I did was to pass the ResultSet object to the webpage, and then display the result. When the buttons are pressed, I pass this ResultSet to another jsp page where I provide the required functionality. This is then forwarded back to the previous JSP, where the new data is displayed.
However, when the first page is re-displayed, it creates a new connection and i was wondering if there is a way to close the previous connection through the ResultSet?
Also, I wanted to put the ResultSet in a bean, but I think it is causing an error in the web server, saying something like it is not Serializable. Is there any other way to pass the ResultSet around?
Any suggestions on better ways to manage databases though web interfaces would be welcome, or if someone could point me to a good tutorial on this topic!
cheers
Ankur

Bad idea to be passing ResultSets around. Those are database cursors, a scarce resource.
You should load that data into a data structure, close the ResultSet immediately, and then pass the data structure around in session if you must.
Better yet, have a central servlet that deals with all database calls. Let the JSPs just do display, as they were meant to. - MOD

Using beans with jsp

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