Bean VS class

Hi,
I'm developping JSP applications on tomcat and I was wondering what's the difference between a Bean and a simple class.
I mean the difference between using this:
<jsp:useBean id="nvClient" scope="request" class="clients"></jsp:useBean>
instead of this:
<%
clients c = new clients();
%>
I'm asking that because I can't create bean (the file stop executing at the jsp:useBean line) and if I only use the class, it's working.
Thanks,
Stephane

Hi,
i think Its right what steph said. u need have to include the package name. (if u have placed ur bean inside the package). The main difference between the bean and ordinary class instantiation is in its scope. If u r using the jsp:useBean, ur bean can has its scope in the whole application (if u need). The scope of the class instantiation is with in that page only. Hope u got it!!!!

Similar Messages

Error: 500    Cannot create bean of class Simulation

Hello, I was working with J2ee 1.2 and suddenly I got this error. Any one has an idea about it?, I can't continue working.
Thanks...
Error: 500
Internal Servlet Error:
javax.servlet.ServletException: Cannot create bean of class Simulation
     at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:384)
     at _0005csimulation_0002ejspsimulation_jsp_325._jspService(_0005csimulation_0002ejspsimulation_jsp_325.java:215)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:126)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
     at org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet.java:161)
     at org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java:247)
     at org.apache.jasper.runtime.JspServlet.service(JspServlet.java:352)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
     at org.apache.tomcat.core.ServiceInvocationHandler.method(ServletWrapper.java:626)
     at org.apache.tomcat.core.ServletWrapper.handleInvocation(ServletWrapper.java:534)
     at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:378)
     at org.apache.tomcat.core.Context.handleRequest(Context.java:644)
     at org.apache.tomcat.core.ContextManager.service(ContextManager.java:440)
     at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:144)
     at org.apache.tomcat.service.TcpConnectionThread.run(TcpEndpoint.java:310)
     at java.lang.Thread.run(Thread.java:484)
Root cause:
javax.servlet.ServletException: Cannot create bean of class Simulation
     at _0005csimulation_0002ejspsimulation_jsp_325._jspService(_0005csimulation_0002ejspsimulation_jsp_325.java:79)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:126)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
     at org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet.java:161)
     at org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java:247)
     at org.apache.jasper.runtime.JspServlet.service(JspServlet.java:352)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
     at org.apache.tomcat.core.ServiceInvocationHandler.method(ServletWrapper.java:626)
     at org.apache.tomcat.core.ServletWrapper.handleInvocation(ServletWrapper.java:534)
     at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:378)
     at org.apache.tomcat.core.Context.handleRequest(Context.java:644)
     at org.apache.tomcat.core.ContextManager.service(ContextManager.java:440)
     at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:144)
     at org.apache.tomcat.service.TcpConnectionThread.run(TcpEndpoint.java:310)
     at java.lang.Thread.run(Thread.java:484)

This is the code for the simulatin class.
I think nothing special.
Begin --- Simulation.java
import java.io.*;
import java.util.*;
public class Simulation
private int lastMessage;
private int transactions;
private int transaction_prospere;
/* Creation des variables du system */
     private String Quantite_acheteurs;
     private String Quantite_vendeurs;
     private String Argent_initiale;
     private String Articles_initiales;
     private String Prix_initial;
     private String Mechants_acheteurs;
     private String Mechants_vendeurs;
     private String Cycles_simulation;
     private String Choisir_strategie;
     private String Choisir_formule;
     private String Afficher_resultats;
int iAfficher_resultats = (new Integer(Afficher_resultats)).intValue();
     /* Section de declaration des constants */
     private int OFFRE_DE_VENTE = 0;
     private int DEMANDE_ACHAT = 1;
     private int BROADCAST = -1;
private int TRICHEUR = -1;
     private int PROSPERE = 1;
     private int VRAI = 1;
     private int FAUX = 0;
private int ACHETEUR = 0;
private int VENDEUR = 1;
     private int GENTIL = 0;
     private int MECHANT = 1;
     private double SEUIL_MECHANT = 0.87;
Messages message_anterieur= null;
/*** PADOVAN ********************************/
     public String Padovan_alpha;
Begin --- Creation des agents...
Pour la creation des agents il y a une generation des chiffres aleatoires
     pour repartir les vendeurs et les acheteurs, ainsi que les gentils et les
     mechants dans le vecteur d'agents
     public Vector Creation_des_agents(){
System.out.println ("<<<<<<<<<<Executing...Creation_des_agents>>>>>>>>");
/* Le vector avec des agents....*/
          Vector agents = new Vector();
lastMessage = 0; /* Le derni�re message ajout� au tableau */
          transactions = 0; /* Compteur pour les transactions */
          transaction_prospere = 0; /* Compteur pour les transaction prosp�res*/
          /* Conversion de variables de string a int */
int iQuantite_acheteurs = (new Integer(Quantite_acheteurs)).intValue();
int iQuantite_vendeurs = (new Integer(Quantite_vendeurs)).intValue();
int iArgent_initiale = (new Integer(Argent_initiale)).intValue();
int iArticles_initiales = (new Integer(Articles_initiales)).intValue();
int iPrix_initial = (new Integer(Prix_initial)).intValue();
int iMechants_acheteurs = (new Integer(Mechants_acheteurs)).intValue();
int iMechants_vendeurs = (new Integer(Mechants_vendeurs)).intValue();
int i; /* Compteur pour la generation des agents */
          double agent_type; /* Pour generation aleatoire et savoir si est acheteur ou vendeur */
          int iagent_type; /* Type d'agent acheteur=0, vendeur=1 */
          double agent_comportement; /* Pour generation aleatoire et savoir si est gentil ou mechant */
          int iagent_comportement; /* Comportement de l'agent 0=gentil, 1=mechant, gentil par default */
int total=iQuantite_acheteurs+iQuantite_vendeurs;
          /* Pour les agents......... */
          int j=0;
          for (i=0;i<total;)
               iagent_comportement = 0;
j++;
               agent_type=Math.random(); /* Pour repartir les agentes vendeurs et acheteurs aleatoirement. */
iagent_type=(agent_type<0.5?0:1); /* 0-> acheteur, 1-> vendeur */
               if (iagent_type==0){   /*Creation des acheteurs.... */
if(iQuantite_acheteurs>0)
iQuantite_acheteurs--; /* un acheteur de moins */
/* Generation du comportement */
                         if (iMechants_acheteurs>0) /* Faltan generar agentes mechantes */
                         if ((iQuantite_acheteurs > iMechants_acheteurs))
agent_comportement = Math.random(); /* Pour repartir les comportement de l'agent */
iagent_comportement=(agent_comportement<0.5?0:1);     /* 0->gentil, 1->mechant */
                         else
                              iagent_comportement=1;
                         if (iagent_comportement==1) /* S'il est mechante... */
iMechants_acheteurs --;
                         Agents agent = new Agents(i,ACHETEUR,0,0,iArgent_initiale,iagent_comportement, total);
                         agent.setPadovan_alpha(Padovan_alpha);
               i++;
agents.addElement(agent);
               else{                  /* Creation des vendeurs... */
if(iQuantite_vendeurs>0)
                         iQuantite_vendeurs--; /* un vendeur de moins */
/* Generation du comportement */
                         if (iMechants_vendeurs>0) /*Faltan generar agentes mechantes */
                         if ((iQuantite_vendeurs > iMechants_vendeurs))
agent_comportement = Math.random(); /* Pour repartir les comportement de l'agent */
iagent_comportement=(agent_comportement<0.5?0:1);     /* 0->gentil, 1->mechant */
                         else
                              iagent_comportement=1;
                         if (iagent_comportement==1) /* S'il est mechante... */
iMechants_vendeurs --;
Agents agent = new Agents(i,VENDEUR,iArticles_initiales,iPrix_initial,0,iagent_comportement,total);
                         agent.setPadovan_alpha(Padovan_alpha);
               i++;
agents.addElement(agent);
     }/* End for */
System.out.println ("<<<<<<<<<<Ending...Creation_des_agents>>>>>>>>>>");
return agents;
     } /* End Creation_des_agents */
End --- Creation des agents...
Begin --- Setters and getters.........
public void     setQuantite_acheteurs(String Quantite_acheteurs) {
          this.Quantite_acheteurs= Quantite_acheteurs;
public void     setQuantite_vendeurs(String Quantite_vendeurs) {
          this.Quantite_vendeurs= Quantite_vendeurs;
public void     setArgent_initiale(String Argent_initiale) {
          this.Argent_initiale= Argent_initiale;
public void     setArticles_initiales(String Articles_initiales) {
          this.Articles_initiales= Articles_initiales;
public void     setPrix_initial(String Prix_initial) {
          this.Prix_initial= Prix_initial;
public void     setMechants_acheteurs(String Mechants_acheteurs) {
          this.Mechants_acheteurs= Mechants_acheteurs;
public void     setMechants_vendeurs(String Mechants_vendeurs) {
          this.Mechants_vendeurs= Mechants_vendeurs;
public void     setCycles_simulation(String Cycles_simulation) {
          this.Cycles_simulation= Cycles_simulation;
public void     setChoisir_strategie(String Choisir_strategie) {
          this.Choisir_strategie= Choisir_strategie;
public void     setChoisir_formule(String Choisir_formule) {
          this.Choisir_formule= Choisir_formule;
public void     setPadovan_alpha(String Padovan_alpha) {
          this.Padovan_alpha= Padovan_alpha;
public void     setAfficher_resultats(String Afficher_resultats) {
          this.Afficher_resultats= Afficher_resultats;
public String getPadovan_alpha( ){
return this.Padovan_alpha;
} // End of the class Simulation
End --- Simulation

Javax.servlet.jsp.JspException: Exception creating bean of class ProdFormFB

Hi I am trying to deploy a struts based web application using "DynaActionForms"
When I am trying to access the jsp page I am getting the following error.
I am providing as much as details as it can help full to u.
Thank u.
FormBean class ProdFormFB.java
========================================================================
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import org.apache.struts.action.*;
public class ProdFormFB extends DynaActionForm
public void reset(ActionMapping mapping, HttpServletRequest request)
     System.out.println("reset() called. . . . ");
set("prodId", new Integer(10));
     set("prodName", new String("XYZ"));
     set("price", new Float(22.25));
public ActionErrors validate(ActionMapping mappings, HttpServletRequest request)
System.out.println("=== validate() called ===");
ActionErrors aes=new ActionErrors();
     System.out.println("aes.size() ===> "+aes.size());
     String prodName = (String)get("prodName");
     if( prodName==null || prodName.equals("") )
          System.out.println("Adding prodName.req error . . . . . . .");
          aes.add("prodName",new ActionError ("prodName.req.error"));
return aes;
========================================================================
Action Class ProdAction.java
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import org.apache.struts.action.*;
public class ProdAction extends Action
   public ActionForward execute(ActionMapping mapping,ActionForm form, HttpServletRequest request,HttpServletResponse response)throws Exception
      ProdFormFB fb = (ProdFormFB)form;
      System.out.println("fb.get('prodId')==> "+fb.get("prodId"));
      System.out.println("fb.get('prodName')==> "+fb.get("prodName"));
      System.out.println("fb.get('price')==> "+fb.get("price"));
       return mapping.findForward("dres");
}========================================================================
jsp page : npform.jsp
<%@ taglib uri = "/tags/struts-html" prefix="html"%>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<html:html>
<head>
     <title>Product Form</title>
</head>
<body>
          <html:form action="/pAction">
          <center>
            <br><br>
            <center> <font color="green" style="bold" size=5>Product Form using Struts</font></center><br><br>
            <table>
            <tr>
               <td>
                      <b> Product ID : </b> <html:text property="prodId"/> </td><td><font color="red" style="bold"><html:errors property="prodId"/> </font>
             </td>
         </tr>
           <tr>
               <td>
                      <b> Prod Name : </b> <html:text property="prodName"/> </td><td> <font color="red" style="bold"> <html:errors property="prodName"/> </font>
             </td>
          </tr>

           <tr colspan="2" align="center">
               <td>
                  <html:submit property="submit" value="Store"/>
            </td>
          </tr>
          </table>
                      </center>
       </html:form>
</body>
</html:html>========================================================================
Configuration in struts-config.jsp
    <form-beans>
         <form-bean name="NewProdForm" type="ProdFormFB">
              <form-property name="prodId" type="java.land.Integer"/>
              <form-property name="prodName" type="java.land.String"/>
              <form-property name="price" type="java.land.Float"/>
        </form-bean>
</form-beans>
<action-mappings>
       <action name="NewProdForm" path="/pAction" type="ProdAction" input="/npform.jsp" validate="true" scope="request">
              <forward name="dres" path="/dres.jsp"/>
       </action>
</action-mappings>========================================================================
After deploying successfully I am I am entering the following URL
http://localhost:7001/oursapp/npform.jsp
The following Exception on Browser: and also on the server console ......
javax.servlet.jsp.JspException: Exception creating bean of class ProdFormFB: {1}
     at org.apache.struts.taglib.html.FormTag.initFormBean(FormTag.java:463)
     at org.apache.struts.taglib.html.FormTag.doStartTag(FormTag.java:433)
     at jsp_servlet.__npform._jspService(__npform.java:178)
     at weblogic.servlet.jsp.JspBase.service(JspBase.java:33)
     at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1006)
     at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:419)
     at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:315)
     at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6718)
     at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
     at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
     at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3764)
     at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2644)
     at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
     at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)
Plz... Help me out is solving the problem .......
my email :   [email protected]

I never used DynaActionForm, what I have noticed here is, don't you need to declare the form bean? I may be wrong.
<form-beans>
<form-bean name="newProdForm" type="com.package.form.NewProdForm"></form-bean>
</form-beans>

Javax.servlet.ServletException: Cannot create bean of class

People,
HELP!! I am getting desperate!!!
I am a newbie when it comes to TOMCAT, but i have been using Blazix before.
My current system is using APACHE/TOMCAT on a Solaris machine and I keep hitting the same problem. I have gone through the archives but the only thing it states is to check the directory which i have done.
I keep getting:
Error 500
Internal Error
javax.servlet.ServletException: Cannot create bean of class MyClass
The code used to work on the Blazix server so i am assuming it is something to do with a config parameter somewhere - but i do not know where. I have checked the directory/package structure and they seem to work. It even serves it when they are html pages not jsp, but obviously wont use the bean. :(
I can post code if necessary.
Please help
Steve

The FormData.class file is in examples/WEB-INF/classes/ directory.
Is this wrong? then should it be in a package called examples.steve???
<TITLE> Poc </TITLE>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<META NAME="Generator" CONTENT="Mozilla/4.61 [en] (WinNT; I) [Netscape]">
<META NAME="Author" CONTENT="Steve Brodie">
<META NAME="Proof of Concept order entry system" CONTENT="">
<META NAME="PROOF OF CONCEPT ORDER ENTRY SYSTEM " CONTENT="">
</HEAD>
<%@ page import="steve.FormData" %>
<jsp:useBean id="user" class="steve.FormData"/>
<jsp:setProperty name="user" property="*"/>
<FORM METHOD=POST ACTION="SaveDetails.jsp">
<CENTER>
<H1>
POC CNS demo <BR>
POC Order Entry System <BR></H1>
<H2><CENTER>PROOF OF CONCEPT ORDER ENTRY SYSTEM <BR>
in order to illustrate the use of an new product<BR></H1>
</CENTER>
<BODY>
Please enter the following details: <BR>
Second name <INPUT TYPE=TEXT NAME=secondName SIZE=20><BR>
First name <INPUT TYPE=TEXT NAME=firstName SIZE=20><BR>
Address <INPUT TYPE=TEXT NAME=address1 SIZE=20><BR>
Address <INPUT TYPE=TEXT NAME=address2 SIZE=20><BR>
Post Code <INPUT TYPE=TEXT NAME=postCode SIZE=10><BR>
Phone NO. <INPUT TYPE=TEXT NAME=phone SIZE=10><BR>
<BR>
Credit Card<INPUT TYPE=TEXT NAME=credit SIZE=15><BR>
<BR>
Quality of Service:
<SELECT TYPE=TEXT NAME="QoS">
<OPTION SELECTED TYPE=TEXT NAME=Gold>Gold <BR>
<OPTION TYPE=TEXT NAME=Silver>Silver <BR>
<OPTION TYPE=TEXT NAME=Bronze>Bronze <BR>
</SELECT>
<BR>
<BR>
<INPUT TYPE=RESET>
<P><INPUT TYPE=SUBMIT>
<BR>
<BR>
<IMG SRC=../images/Cisco.gif>
</FORM>
</BODY>
</HTML>
package steve;
* @author Steven Brodie
* @date
* @version 0.0
import java.io.*;
import java.lang.*;
import java.util.*;
public class FormData {
     String secondName = null;
     String firstName = null;
     String address1 = null;
     String address2 = null;
     String postCode = null;
     int credit = 0;
     int phone = 0;
     String qos = null;
     String file = "out";
     String filex = "xout";
     PrintWriter pout = null;
     PrintWriter xout = null;
     FormData() {
          try {
               pout = new PrintWriter(new BufferedWriter(new FileWriter(file + ".txt")));
               xout = new PrintWriter(new BufferedWriter(new FileWriter(filex + ".xml")));
          xout.println("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
          xout.println("<OrderEntry xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"");
          xout.println("xsi:noNamespaceSchemaLocation=\"http://machine2.com:8080/xml/xsd/OrderEntry.xsd\">");
          } catch (IOException ioe) {
               System.err.println("DataFileWriter error ioe on init");
               ioe.printStackTrace();
               System.exit(1);
public void setFirstName( String value ) {
firstName = value;
          System.out.println(firstName);
          pout.println(firstName);
          xout.println("<firstname value= \"" + firstName + "\"/>");
public void setSecondName( String value ) {
secondName = value;
          System.out.println(secondName);
          pout.println(secondName);
          xout.println("<secondname value= \"" + secondName + "\"/>");
public void setAddress1( String value ) {
address1 = value;
          System.out.println(address1);
     pout.println(address1);
          xout.println("<address1 value= \"" + address1 + "\"/>");
public void setAddress2( String value ) {
address2 = value;
          System.out.println(address2);
          pout.println(address2);
          xout.println("<address2 value= \"" + address2 + "\"/>");
public void setPostCode( String value ) {
postCode = value;
          System.out.println(postCode);
          pout.println(postCode);
          xout.println("<postCode value= \"" + postCode + "\"/>");
public void setCredit( int value ) {
credit = value;
          System.out.println(credit);
          pout.println(credit);
          xout.println("<creditCard value= \"" + credit + "\"/>");
     public void setPhone( int value) {
          phone = value;
          System.out.println("0" + phone);
          pout.println("0" + phone);
          xout.println("<phoneNo value= \"0" + phone + "\"/>");
public void setQoS( String value ) {
qos = value;
          System.out.println(qos);
          pout.println(qos);
          xout.println("<QoS value= \"" + qos + "\"/>");
          xout.println("</OrderEntry>");
          pout.flush();
          pout.close();
          xout.flush();
          xout.close();
public String getFirstName() {
          return firstName;
public String getSecondName() {
          return secondName;
public String getAddress1() {
          return address1;
public String getAddress2() {
          return address2;
public String getPostCode() {
          return postCode;
public int getCredit() {
          return credit;
     public int getPhone() {
          return phone;
     public String getQoS() {
          return qos;

Is there a bean or class framework for DatabaseSession?

Looking for a bean or class framework that supports a rather conventional 2-tier rich client/forms-type application.
Ideally (1) a bean encapsulating DatabaseSession to support QBE, navigation, insert, and delete functions over a Collection specified as a parameter to the bean; (2) a bean implemting a JToolBar to drive the first bean; and (3) document models to connect the object Collection to Swing widgets.
Anyone have or know of such a framework?
Thanks,
Gerald

I was just wondering the same thing. With the new Facebook and Twitter integration, it seems to me that it should be the next logical step for iTunes.
Also, i love iCloud and iTunes Match, however, with this "cloud" technology now available and working great, I'd like to see iTunes move in a direction similar to Spotify. At this point, I don't see why (if I have all my music physically stored in my home computer) I have to re-download it into my devices (iPhone and iPad) to listen to it remotely... It should simply stream right from the cloud, and not actually take up precious space in your devices... This would be a great fix...
I use iTunes a lot because I use it to maintain my music collection, which I have built up over the years, but to be honest, I haven't downloaded an album or song since I became a member of Spotify about a year ago. Its just less of a hassle. No need to back up your music files because of the fear that you might lose them all, a thought which would sometimes keep me up at night... (It happened to my brother). With Spotify, all the music in the world is just there... being administered by someone else... all you have to do is hit play... and pay the monthly fee, of course...
Anyways, sorry for the long speech...

Cannot create bean of class Error

Ok first off I realize several people have post messages similar to this - but the replys to those messages didn't help me:
Today the webserver I had my code on crashed - and was restarted.
Everything is working except for 1 page.
When I load it I get this error:
Error: 500
Location: /dynamic/VOTE_chart.jsp
Internal Servlet Error:
javax.servlet.ServletException: Cannot create bean of class update.VoteBean
     at _0002fVOTE_0005fchart_0002ejspVOTE_0005fchart_jsp_6._jspService(_0002fVOTE_0005fchart_0002ejspVOTE_0005fchart_jsp_6.java:71)
     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$JspServletWrapper.service(JspServlet.java:177)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:318)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:391)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
     at org.apache.tomcat.core.Handler.service(Handler.java:286)
     at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
     at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797)
     at org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
     at org.apache.tomcat.service.connector.Ajp12ConnectionHandler.processConnection(Ajp12ConnectionHandler.java:166)
     at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
     at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
     at java.lang.Thread.run(Thread.java:484)
This tells my sod all what's actually wrong - I've tried renaming the jsp, I've tried renaming and recompiling the bean but that didn't help either (yes I redirected towards page to the new bean).
No-one here has a clue what the hell has gone wrong with this - especially cos I have at least 15 other beans in exactly the same place and they all work fine.
If you wish I'll post the code of the relevant jsp here.
Any suggestions?

most of this is irrelevent but you should be able to find what you need
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta Http-Equiv="Cache-Control" Content="no-cache">
<meta Http-Equiv="Pragma" Content="no-cache">
<script language="JavaScript">

</script>
</head>
<body bgcolor="#000066" onLoad="MM_preloadImages('images/previousOver.jpg','images/backOver.jpg')" leftmargin="0" topmargin="0" marginwidth="0" marginheight="0">
<jsp:useBean id="myBean" class= "update.VoteBean" scope="page" /> <jsp:setProperty name="myBean" property="*" />
<%
if (!myBean.isDone())
{%>
<form method="post">
<table width="422" border="0" cellspacing="0" cellpadding="0" align="center" height="225">
<tr>
<td colspan="3" height="32"><img src="images/vote.jpg" width="480" height="42"></td>
</tr>
<tr bgcolor="#000066">
<td colspan="3" height="32">
<div align="left"><b><font face="Arial, Helvetica, sans-serif" size="4" color="#cc0033">previous
results </font></b></div>
</td>
</tr>
<tr>
<td colspan="3" height="69">
<div align="center"><img name="Image9" border="0" src="images/previous.jpg" width="160" height="23"></div>
</td>
</tr>
<tr>
<td colspan="3" height="32"><b><font face="Arial, Helvetica, sans-serif" size="4" color="#cc0033">this
months vote</font></b></td>
</tr>
<tr>
<td colspan="3" height="54">
<div align="left"> <font face="Arial, Helvetica, sans-serif" size="2" color="ffcc00"><%=myBean.getQuestion()%>
</font></div>
</td>
</tr>
</table>
<table width="474" border="0" cellspacing="1" cellpadding="1" align="center" height="68">
<tr>
<td width="206">
<div align="left"> <font face="Arial, Helvetica, sans-serif" size="1" color="#FFFFFF">
<input type="radio" name="radiobutton" value="ONE">
<%=myBean.getOption1()%></font> </div>
</td>
<% double thisVote=Double.parseDouble(myBean.getVotes1());
          double overall=myBean.getTotalVotes();
          double ans=(thisVote/overall)*100*3;
               int intAns=(int)Math.round(ans);
          %>
<td width="253"><font face="Arial, Helvetica, sans-serif" size="1" color="#FFFFFF"><img src="images/bar_white.jpg" width="<%=intAns%>" height="10">
<%=intAns/3%>%</font> </td>
</tr>
<tr>
<td width="206" height="2">
<div align="left"> <font face="Arial, Helvetica, sans-serif" size="1" color="#FFFFFF">
<input type="radio" name="radiobutton" value="TWO">
<%=myBean.getOption2()%></font> </div>
</td>
<% thisVote=Double.parseDouble(myBean.getVotes2());
          overall=myBean.getTotalVotes();
          ans=(thisVote/overall)*100*3;
               intAns=(int)Math.round(ans);
          %>
<td width="253" height="2"><font face="Arial, Helvetica, sans-serif" size="1" color="#FFFFFF"><img src="images/bar_white.jpg" width="<%=intAns%>" height="10">
<%=intAns/3%>%</font> </td>
</tr>
<tr>
<td width="206" height="2">
<div align="left"> <font face="Arial, Helvetica, sans-serif" size="1" color="#FFFFFF">
<input type="radio" name="radiobutton" value="THREE">
<%=myBean.getOption3()%></font> </div>
</td>
<% thisVote=Double.parseDouble(myBean.getVotes3());
          overall=myBean.getTotalVotes();
          ans=(thisVote/overall)*100*3;
               intAns=(int)Math.round(ans);
          %>
<td width="253" height="2"><font face="Arial, Helvetica, sans-serif" size="1" color="#FFFFFF"><img src="images/bar_white.jpg" width="<%=intAns%>" height="10">
<%=intAns/3%>%</font> </td>
</tr>
<tr>
<td width="206" height="2">
<div align="left"> <font face="Arial, Helvetica, sans-serif" size="1" color="#FFFFFF">
<input type="radio" name="radiobutton" value="FOUR">
<%=myBean.getOption4()%></font> </div>
</td>
<% thisVote=Double.parseDouble(myBean.getVotes4());
          overall=myBean.getTotalVotes();
          ans=(thisVote/overall)*100*3;
               intAns=(int)Math.round(ans);
          %>
<td width="253" height="2"><font face="Arial, Helvetica, sans-serif" size="1" color="#FFFFFF"><img src="images/bar_white.jpg" width="<%=intAns%>" height="10">
<%=intAns/3%>%</font> </td>
</tr>
<tr>
<td width="206" height="2">
<div align="left"> <font face="Arial, Helvetica, sans-serif" size="1" color="#FFFFFF">
<input type="radio" name="radiobutton" value="FIVE">
<%=myBean.getOption5()%></font> </div>
</td>
<% thisVote=Double.parseDouble(myBean.getVotes5());
          overall=myBean.getTotalVotes();
          ans=(thisVote/overall)*100*3;
               intAns=(int)Math.round(ans);
          %>
<td width="253"><font face="Arial, Helvetica, sans-serif" size="1" color="#FFFFFF"><img src="images/bar_white.jpg" width="<%=intAns%>" height="10">
<%=intAns/3%>%</font> </td>
</tr>
</table>
<p align="center">
<input type="submit" name="Submit" value="Cast a Vote">
</p>
<p align="center"> </p>
<p align="center"> </p>
<p align="center"> </p>
<p align="center"> </p>
<p align="center"> </p>
<p align="center"> </p>
<p align="center"> </p>
<p align="center"> </p>
<p align="center"> </p>
</form>
<%
else
myBean.setDone(false);
String done=myBean.checkVote();
if (done.equals("OK"))
System.out.println("OK");
%>
<table width="424" border="0" cellspacing="0" cellpadding="0" align="center" height="103">
<tr bgcolor="#000066">
<td height="43" colspan="2"><img src="images/vote.jpg" width="480" height="42"></td>
</tr>
<tr bgcolor="#000066">
<td height="43" colspan="2">
<div align="left"><b><font face="Arial, Helvetica, sans-serif" size="4" color="#cc0033">complete
</font></b></div>
</td>
</tr>
</table>
<table width="463" border="0" cellspacing="3" cellpadding="4" align="center">
<tr>
<td width="327"><font face="Arial, Helvetica, sans-serif" size="1" color="#ffcc00">Thank
you for voting. Your vote will be instantly added to the calculations.</font></td>
<td width="109"> </td>
</tr>
</table>
<table width="461" border="0" cellspacing="3" cellpadding="4" align="center">
<tr>
<td height="53">
<div align="center"> <img name="Image10" border="0" src="images/back.jpg" width="160" height="23"></div>
</td>
</tr>
<tr>
<td height="397"> </td>
</tr>
</table>
<%}else{
System.out.println("Not equal or fell over");%>
<table width="454" border="0" cellspacing="0" cellpadding="0" align="center" height="103">
<tr bgcolor="#000066">
<td height="43" colspan="2"><img src="images/vote.jpg" width="480" height="42"></td>
</tr>
<tr bgcolor="#000066">
<td height="43" colspan="2">
<div align="left"><b><font face="Arial, Helvetica, sans-serif" size="4" color="#cc0033">sorry
</font></b></div>
</td>
</tr>
</table>
<table width="469" border="0" cellspacing="3" cellpadding="4" align="center">
<tr>
<td width="327"><font face="Arial, Helvetica, sans-serif" size="1" color="#ffcc00">There
has been a problem casting your vote. Please try again later.</font></td>
<td width="115"> </td>
</tr>
</table>
<table width="467" border="0" cellspacing="3" cellpadding="4" align="center">
<tr>
<td height="37">
<div align="center"> <img name="Image101" border="0" src="images/back.jpg" width="160" height="23">
</div>
</td>
</tr>
<tr>
<td height="560"> </td>
</tr>
</table>
<%}
%>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
</body>
</html>

Cannot create bean of class

Dear Friends
My tomcat server 3.2.4 is giving following error when i am going to run my jsp.
javax.servlet.ServletException: Cannot create bean of class dts.query.ProjectSearchResultsPage
     at jspprojects._0002fjspprojects_0002fprojectsearchresults_0002ejspprojectsearchresults_jsp_12._jspService(_0002fjspprojects_0002fprojectsearchresults_0002ejspprojectsearchresults_jsp_12.java:111)
     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$JspCountedServlet.service(JspServlet.java:130)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:282)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:429)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:500)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
     at org.apache.tomcat.core.Handler.service(Handler.java:287)
     at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
     at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:806)
     at org.apache.tomcat.core.ContextManager.service(ContextManager.java:752)
     at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:213)
     at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
     at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)
     at java.lang.Thread.run(Thread.java:484)
=====================
Please help me, Thanx in advance

i am not sure but maybe an explicit constructor ( with no parameters ) for the bean will solve the problem ?

Cannot create bean of class...using TOMCAT 3.1

my root is: "notwww.ucsd.edu/somesub/"
my beans are in .../WEB-INF/classes/aseBeans/
the error msg:
Error: 500
Location: /studentaffairs/aseAppValidate.jsp
Internal Servlet Error:
javax.servlet.ServletException: Cannot create bean of class aseBeans.AseApplicationBean
     at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:386)
     at _0002faseAppValidate_0002ejspaseAppValidate_jsp_0._jspService(_0002faseAppValidate_0002ejspaseAppValidate_jsp_0.java:138)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:126)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet.java:174)
     at org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java:261)
     at org.apache.jasper.runtime.JspServlet.service(JspServlet.java:369)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:503)
     at org.apache.tomcat.core.ContextManager.service(ContextManager.java:559)
     at org.apache.tomcat.service.connector.Ajp12ConnectionHandler.processConnection(Ajp12ConnectionHandler.java:156)
     at org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java:338)
     at java.lang.Thread.run(Thread.java:496)
Root cause:
javax.servlet.ServletException: Cannot create bean of class aseBeans.AseApplicationBean
     at _0002faseAppValidate_0002ejspaseAppValidate_jsp_0._jspService(_0002faseAppValidate_0002ejspaseAppValidate_jsp_0.java:71)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:126)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet.java:174)
     at org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java:261)
     at org.apache.jasper.runtime.JspServlet.service(JspServlet.java:369)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:503)
     at org.apache.tomcat.core.ContextManager.service(ContextManager.java:559)
     at org.apache.tomcat.service.connector.Ajp12ConnectionHandler.processConnection(Ajp12ConnectionHandler.java:156)
     at org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java:338)
     at java.lang.Thread.run(Thread.java:496)
I think I have all the necessary elements:
package aseBeans;
pickled my beans
<jsp:useBean id="app" scope="session" class="aseBeans.AseApplicationBean" >
<jsp:setProperty.../>
</jsp:useBean>
MANIFEST.MF was created, are the name/attribute pairs necessary?
Name: AseApplicationBean.class
Java-Bean: true
THANK YOU

hubertn I modified the jsp file and the bean: here's the code:
<%@ page import = "num.NumberGuessBean" %>
<jsp:useBean id="numguess" class="num.NumberGuessBean" scope="session"/>
<jsp:setProperty name="numguess" property="*"/>
<html>
<head><title>Number Guess</title></head>
<body bgcolor="white">
<font size=4>
<% if (numguess.getSuccess()) { %>
Congratulations! You got it.
And after just <%= numguess.getNumGuesses() %> tries.<p>
<% numguess.reset(); %>
Care to try again?
<% } else if (numguess.getNumGuesses() == 0) { %>
Welcome to the Number Guess game.<p>
Play with default limits ( a number between 0 and 100)<p>
or enter upper and lower limits.<p>
<form method=get>
Play with defaults?: <input type=radio name=default value="yes">Yes
<input type=radio name=default value="no">No
</form>
<% if (numguess.getRadio().equals("no")) { %>
<form method=get>
Enter upper limit:<input type=text name=upperLimit>
Enter lower limit:<input type=text name=lowerLimit>
</form>
<% numguess.reset(); %>
<% } %>
<form method=get>
What's your guess? <input type=text name=guess>
<input type=submit value="Submit">
</form>
<% } else { %>
Good guess, but nope. Try <b><%= numguess.getHint() %></b>.
You have made <%= numguess.getNumGuesses() %> guesses.<p>
I'm thinking of a number between <jsp:getProperty name="numguess" property="lowerLimit"/> and <jsp:getProperty name="numguess" property="upperLimit"/>.<p>
<form method=get>
What's your guess? <input type=text name=guess>
<input type=submit value="Submit">
</form>
<% } %>
</font>
</body>
</html>
and the bean:
* Originally written by Jason Hunter, http://www.servlets.com.
package num;
import java.util.*;
public class NumberGuessBean {
int answer;
boolean success;
String hint;
int numGuesses;
String radiochoice;
int lowerLimit=0;
int upperLimit=100;
String error;
public NumberGuessBean() {
reset();
public void setGuess(String guess) {
numGuesses++;
int g;
try {
g = Integer.parseInt(guess);
catch (NumberFormatException e) {
g = -1;
if (g == answer) {
success = true;
else if (g == -1) {
hint = "a number next time";
else if (g < answer) {
hint = "higher";
else if (g > answer) {
hint = "lower";
public void setRadio(String s) {
     radiochoice=s;
public String getRadio() {
     return radiochoice;
public void setLowerLimit( int lowerLimit) {
     this.lowerLimit=lowerLimit;
public int getLowerLimit() {
     return lowerLimit;
public void setUpperLimit(int upperLimit) {
     this.upperLimit=upperLimit;
public int getUpperLimit() {
     return upperLimit;
public boolean getSuccess() {
return success;
public String getHint() {
return "" + hint;
public String getError() {
     return ""+error;
public int getNumGuesses() {
return numGuesses;
public void reset() {
     if (getRadio().equals("yes")) {
          answer = (int)(Math.random()*100);
     else {
          int i;
          i=(int)(Math.random()*upperLimit);
          if (i<lowerLimit) {
               i=i+lowerLimit;
          answer=i;
     success = false;
numGuesses = 0;
}

What is exact diff between Bean and Class

As my knowledge...
Class should not depends on any specified rules..But Bean should specified on specified rules, like setters and getters....
is there any more........
thanks for giving help..........

Yes, but what are they good for, except for providing
examples of really bad OO design by just being a
complicated struct?Look at Spring; an extremely powerful application configuration tool (and much, much more); all possible because of JavaBean conventions. Otherwise Spring would have had one set of conventions, JSF another, Hibernate another still, making programmers' lives difficult.
Look at the PropertyEditorSupport class - it's fantastic that I can write a standardized String-to-instance-to-String class for a particular type and just have frameworks like Spring take care of the problems generating my domain model from configuration. Using a standard mechanism makes me confident that if, in the future, I ditch Spring, my bespoke property editors will not be obsolete.

HELP! - BEAN and CLASS interchange?

When I setup to a bean like:
<jsp:useBean id="logger" scope="application" class="Logger" />
I can use the bean and bean's functions fine in the JSP, but not within functions that exist in the JSP like:
jspInit()
it says the "logger" is undefined. Is there a way I can access the logger function within the jspInit class or do i have to redefine a new instance of "logger" within jspInit().
The whole point is I would like to use the same instance of the class from all the JSPs. Thats what scope=application seems to do instead of instantiating everytime.
P.S. If I were to instantiate a class like:
Logger logger = new Logger;
would I be able to give it "applicate scope"? like a bean can have?
Really long question, thanks a lot for the help. :)

Hi yusufm1,
I can use the bean and bean's functions fine in the JSP, but not within functions that exist in the JSP like:
jspInit()it says the "logger" is undefined.
What ever you write in jsp, other than in <%! %> tags, is a part of _jspService() method. The life cycle of jsp has following 3 steps.
1. jspInit()
2. _jspService()
3. jspDestroy()
jspInit() is the first method of the jsp class that is executed. _jspService is the next method. The statement -
<jsp:useBean id="logger" scope="application" class="Logger" />
instantiates a bean in _jspService() method of jsp class. So it is evident that this instance is not available in jspInit().method.
Is there a way I can access the logger function within the jspInit class or do i have to redefine a new instance of "logger" within jspInit().
To use the bean instance in jspInit() you should instantiate the bean object in jspInit() or declare it as an instance variable.
If I were to instantiate a class like:
Logger logger = new Logger;
would I be able to give it "applicate scope"? like a bean can have?
No, simply instantiating a class in the jspInit() method wouldnot provide it with application scope. You have to put that instance in ServletContext (application) to make it available to all jsp pages. If you instantiate a class in jspInit() only and donot put it in application it is not even available to _jspService() method.
Hope this helps

Beans and classes

Is it possible to use bean not just as storage but as a class- to use methods other then get or set on it? I added a little method that just prints out all of the parameters but what I get is
javax.servlet.ServletException: foo.Creature.stats()Ljava/lang/String;
at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:536)
at org.apache.jsp.index1_jsp._jspService(index1_jsp.java:77)
(jsp page is index1.jsp)
and in that index1_jsp.java file line 77 looks like
if (pageContext != null) pageContext.handlePageException(t);
which doesnt tell me a whole lot. So how do I use methods on beans and how do I make errors make more sence?

Sure you can call other methods of your bean.
How are you invoking it? How does it print out the 'parameters'?
What you might try is wrapping it in your own exception code to see what happens.
You will need to import java.io.PrintWriter to get this to work.
<%@ page import="java.io.PrintWriter" %>
<%
try{
call your method...
catch (Throwable t){
%>
ERROR IN MY CODE HERE <br>
<pre><% t.printStackTrace(new PrintWriter(out));%></pre>
<%
%>(Yes I know this code is ugly, but it does work for me)

Java.lang.StackOverflowError due to java.beans.XMLEncoder class

Hello,
I am using the XMLEncoder class as follows :
private byte[] serialize(Map decodedBlob) {
ByteArrayOutputStream bObjOut = new ByteArrayOutputStream();
if (decodedBlob == null) {
return null;
} else {
try {
XMLEncoder encode = new XMLEncoder(new GZIPOutputStream(bObjOut));
encode.writeObject(decodedBlob);
encode.flush();
encode.close();
} catch (Exception e) {
e.printStackTrace();
return bObjOut.toByteArray();
} The object decodedBlob is of type HashMap and further contains other HashMaps and ArrayLists as its values. Including values in all the childs there are more than a 200 variables conatined in this HashMap. I need to call the above serialize method for some 2000 such decodedBlob objects .However when i do run my program it gives me the following error after processing some 168 objects only:
Exception in thread "main" java.lang.StackOverflowError
at java.util.Collections$SynchronizedMap.containsKey(Collections.java:1988)
at java.lang.reflect.Proxy.isProxyClass(Proxy.java:630)
at java.beans.MetaData.getPersistenceDelegate(MetaData.java:890)
at java.beans.Encoder.getPersistenceDelegate(Encoder.java:144)
at java.beans.Encoder.writeObject(Encoder.java:68)
at java.beans.XMLEncoder.writeObject(XMLEncoder.java:269)
at java.beans.Encoder.writeObject1(Encoder.java:201)
at java.beans.Encoder.cloneStatement(Encoder.java:209)
at java.beans.Encoder.writeExpression(Encoder.java:273)
at java.beans.XMLEncoder.writeExpression(XMLEncoder.java:384)
at java.beans.PersistenceDelegate.writeObject(PersistenceDelegate.java:112)
at java.beans.Encoder.writeObject(Encoder.java:69)
at java.beans.XMLEncoder.writeObject(XMLEncoder.java:269)
at java.beans.Encoder.writeObject1(Encoder.java:201)
at java.beans.Encoder.cloneStatement(Encoder.java:209)
at java.beans.Encoder.writeExpression(Encoder.java:273)
at java.beans.XMLEncoder.writeExpression(XMLEncoder.java:384)
at java.beans.PersistenceDelegate.writeObject(PersistenceDelegate.java:112)
at java.beans.Encoder.writeObject(Encoder.java:69)
at java.beans.XMLEncoder.writeObject(XMLEncoder.java:269)
at java.beans.Encoder.writeObject1(Encoder.java:201)
at java.beans.Encoder.cloneStatement(Encoder.java:209)
at java.beans.Encoder.writeExpression(Encoder.java:273)
at java.beans.XMLEncoder.writeExpression(XMLEncoder.java:384)
at java.beans.PersistenceDelegate.writeObject(PersistenceDelegate.java:112)
at java.beans.Encoder.writeObject(Encoder.java:69)
at java.beans.XMLEncoder.writeObject(XMLEncoder.java:269)
at java.beans.Encoder.writeObject1(Encoder.java:201)
at java.beans.Encoder.cloneStatement(Encoder.java:209)
at java.beans.Encoder.writeExpression(Encoder.java:273)As can be seen the following lines keep repeating in the error:
at java.beans.Encoder.writeObject(Encoder.java:68)
at java.beans.XMLEncoder.writeObject(XMLEncoder.java:269)
at java.beans.Encoder.writeObject1(Encoder.java:201)
at java.beans.Encoder.cloneStatement(Encoder.java:209)
at java.beans.Encoder.writeExpression(Encoder.java:273)
at java.beans.XMLEncoder.writeExpression(XMLEncoder.java:384)
at java.beans.PersistenceDelegate.writeObject(PersistenceDelegate.java:112)I have seen the other posts regarding the same on the forum but even overriding the mutatesTo as described there doesnt help.
I have also tried increasing the heap size but that also doesnt seem to solve the problem.
Please please help me sort this problem out. Thanks in advance

hey ... i just found a way out .... when i upgraded to version 6 the error simply vanished ... seems there was a bug in d previous version for the XMLEncoder class. Thanks anyway.
So for all the others who are facing similar problem try running the code with jre 1.6 too and see if it solves your problem

What is correct row bean property class?

I'm trying to extend the WL9.0 administrative console
          and I'm tryign to use the templates provided for viewing
          table form content there. The problem is as follows:
          I define a JSP that shows a table, each row showing data
          from my own bean class 'SponsorListItem'
          --->JSP snippet
          <%@ page language="java" %>
          <%@ taglib uri="/WEB-INF/console-html.tld" prefix="wl" %>
          <%@ taglib uri="/WEB-INF/fmt.tld" prefix="fmt" %>
          <%@ taglib uri="/WEB-INF/beehive-netui-tags-template.tld" prefix="beehive-template" %>
          <fmt:setBundle basename="mgmtconsole" var="current_bundle" scope="page"/>
          <beehive-template:template templatePage="/layouts/tableBaseLayout_netui.jsp">
          <beehive-template:section name="configAreaIntroduction">
          <fmt:message key="mysoftware.mgmtconsole.sponsorlist.title" bundle="${current_bundle}"/>
          </beehive-template:section>
          <beehive-template:section name="table">
          <wl:table
          name="sponsorListForm"
          property="sponsors"
          showcheckboxes="false"
          captionEnabled="true"
          controlsEnabled="false"
          bundle="mgmtconsole"
          formEnabled="true"
          showheadings="true"
          singlechange="false">
          <wl:caption>
          <fmt:message key="mysoftware.mgmtconsole.sponsorlist.caption" bundle="${current_bundle}"/>
          </wl:caption>
          <wl:column property="sponsorName" label="mysoftware.mgmtconsole.sponsorlist.sponsorname"/>
          <wl:column property="sponsorCode" label="mysoftware.mgmtconsole.sponsorlist.sponsorcode"/>
          <wl:column property="sponsorId" label="mysoftware.mgmtconsole.sponsorlist.sponsorid"/>
          </wl:table>
          </beehive-template:section>
          </beehive-template:template>
          -->end clip
          My form bean (SponsorListForm) has function
          --->clip
          public SponsorListItem[] getSponsors() { return fArray; }
          <--end clip
          My row bean (SponsorListItem) has the following getters
          -->clip
          public String getSponsorName() { return fName; }
          public String getSponsorCode() { return fCode; }
          public String getSponsorId() { return fId; }
          public String getHandle() { return fId; }
          <--end clip
          So far so good, when I try to view the JSP in the
          mgmt console snippet I get an error:
          java.lang.ClassCastException: java.lang.String
          at com.bea.console.taglib.html.renderer.DefaultCellRenderer.doRender(DefaultCellRenderer.java:36)
          at com.bea.console.taglib.html.TableTag.printTableRows(TableTag.java:749)
          at com.bea.console.taglib.html.TableTag.printTable(TableTag.java:594)
          at com.bea.console.taglib.html.TableTag.doEndTag(TableTag.java:359)
          at jsp_servlet._mgmtconsole._jsp.__mgmtconsole2._jspService(__mgmtconsole2.java:337)
          at weblogic.servlet.jsp.JspBase.service(JspBase.java:34)
          at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:214)
          at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:120)
          If I set the getters from SponsorListItem to return null I do not get the error - instead I get the correct number of rows with empty content (naturally as I did not give any content, just nulls). So it seems that the cell renderer assumes that the property is of some class other than java.lang.String but I cannot find from the documentation what is the class it wants. If I had the source of the renderer I could go and have a look at there but naturally I do not have that...
          So, what is the correct class to return for a row bean property?

It appears the assumed class for getHandle() in the row item bean is com.bea.console.handles.Handle which can be found from the console.jar in the server/lib/consoleapp/webapp/WEB-INF/lib.
          If I subclass this item and then make my row bean return instances of these for the getHandle() then I do not get class cast exception.

Deploying multiple beans & support classes, related questions

I have an application that I'm trying to deploy to the latest JServer with Oracle 8i 8.1.6 on Windows 2000. We used JDeveloper to write the code and to deploy the EJBs. I have some questions and it'd be great if someone can answer them.
All documentation seem to indicate that beans must be deployed one at a time. Is this the case? If not, how?
If so, what is the "correct" way to deploy helper classes which are used by more than one bean?
Is there always only one instance of a class in the database, even though I might deploy the same helper class with different beans? If not, is there any mechanism to ensure consistency?
Can I just update a helper class in the database?
How do I see what classes are in the database? How do I manipulate them (e.g. delete, change, add, view size) ?
Is there an easy way to "clean out" the database of all classes, so as to start anew?
null

The Java-related documentation was that I was reading. I have a followup question. Is it possible for me to simply deploy some beans without regard for all the helper classes, then at a later point do a load java on all classes that I expect to use, and have it all work?
Thanks. You've been great help.
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by JDev Team (Laura):
Hi Gerald,
I will take a stab at answering your questions:
1. Are you talking about the JDeveloper doc, or the Oracle8i EJB doc?
2. When you create the Deployment Profile in JDeveloper using the Deployment Profile wizard, any classes your EJB depends on should get included in the deployment archive by the dependency analyzer. You can see the contents of what will be deployed by selecting the Preview button on the Sources page of the wizard.
If you want to explictly EXCLUDE a helper class because it has already been deployed with another bean, you can choose the Advanced button. Select one of the Library, archive, class pages on the Advanced dialog, and add the class to the Exclude list. Select OK, then check the Preview button again to make sure it was excluded.
If you are deploying a number of beans that user the same helper classes, the helper classes will get deployed with the first bean, and on subsequent deployments, the process will detect that the helper class has already been deployed and will check to see if it has changed since the last deployment. I believe it uses a timestamp comparison for this, but I'm not positive. If it detects the source and target are the same, it won't redeploy the class.
If you just want to update a helper class for the EJB, you can use the Java Stored Procedure deployment in the Deployment Profile Wizard, include the helper class in the deployment archive, and do not publish anything.
You can use the Database Browser in JDeveloper to see what deployed Java Classes, and EJBs are stored in your database. Double-click on the IIOP connection you used to deploy the EJBs (under the Connections node in the Navigator). This will display the Database Browser. Expand the appropriate nodes to view the deployed objects.
To see deployed Java Classes, double-click on a JDBC connection and expand the Schema node and then the Deployed Java Classes node.
Many operations are available from the context menus in the Database Browser, including Drop. Others you will have to perform from SQL*Plus or the command line. See the Oracle8i Java Developer's Guide for more information on SQL commands and command line syntax for altering Java objects in the database. This doc, and the EJB and CORBA Developer's Guide are available online from OTN on the Doc pages.
You can use dropjava to drop all classes that were deployed in a given deployment archive by specifying the name of the jar file used during deployment. Again, see the Java Developer's Guide for the syntax.<HR></BLOCKQUOTE>
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CMP Entity Beans Wrapper Classes Source Code

Is there any way to have JDev or OC4J 9.0.4 save the .java source file that creates the wrapper cmr ejb classes? It would be helpful when debugging in JDev for it to have the source to debug with. Or even to just see the generated java file from the abstract cmp beans.
Any one know?
Tkx,
Jim

Hi Jim,
If you haven't already seen it, perhaps this where to find the temperary files created during deployment (from this forum's archives) will help.
Good Luck,
Avi.

Bean VS class

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