Trying to call a data bean from jsp

Question

          I get the following error:
          C:\bea\user_projects\infologic1\.\myserver\.wlnotdelete\extract\myserver_BibleApp_BibleApp\jsp_servlet\__menu.java:146:
          cannot resolve symbol
          probably occurred due to an error in /menu.jsp line 27:
          Enumeration.categoryIds = categories.keys();
          code:
          menu.jsp
          <%@page import="java.util.*"%>
          <jsp:useBean id="DbBean" scope="application" class="showMeItNow.DbBean"/>
          <%
          String base = (String) application.getAttribute("base");
          %>
          <table width="150" cellpadding="5" height="75" cellspacing="0" border="0">
          <tr>
          <td>
          <form>
          <input type="hidden" name="action" value="search">
          <input type="text" name="keyword" size="10">
          <input type="submit" value="go">
          </form>
          </td>
          </tr>
          <tr>
          <td>category</td>
          </tr>
          <tr>
          <tr valign="top">
          <%
          Hashtable categories = DbBean.getCategories();
          Enumeration.categoryIds = categories.keys();
          while (categoryIds.hasMoreElements()) {
          Object categoryId = categoryIds.nextElement();
          out.println("<a href=" + base + "? action=browseCatalog&categoryId="
          + categoryId.toString() + ">" + categories.get(categoryId) + "</a><br>");
          %>
          web.xml
          <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
          "http://java.sun.com/dtd/web-app_2_3.dtd">
          <web-app>
               <servlet>
                    <servlet-name>ControllerServlet</servlet-name>
                    <servlet-class>ControllerServlet</servlet-class>
          <init-param>
               <param-name>base</param-name>
               <param-value>http://localhost:7001/BibleApp/</param-value>
          </init-param>
          <init-param>
               <param-name>imageURL</param-name>
               <param-value>http://localhost:7001/BibleApp/</param-value>
          </init-param>
          <init-param>
               <param-name>dbURL</param-name>
               <param-value>jdbc:weblogic:mssqlserver4:users@COMPAQSERVER</param-value>
          </init-param>
          <init-param>
               <param-name>usernameDbConn</param-name>
               <param-value>dinesh</param-value>
          </init-param>
          <init-param>
               <param-name>passwordDbConn</param-name>
               <param-value>passs</param-value>
          </init-param>
          </servlet>
          </web-app>
          DbBean.class
          package showMeItNow;
          import java.util.*;
          import java.sql.*;
          import showMeItNow.Poll;
          public class DbBean {
          public String dbUrl="";
          public String dbUserName="";
          public String dbPassword="";
          public void setDbUrl(String url) {
          dbUrl=url;
          public void setDbUserName(String userName) {
          dbUserName=userName;
          public void setDbPassword(String password) {
          dbPassword=password;
          public Hashtable getCategories() {
          Hashtable categories = new Hashtable();
          try
          Connection connection = DriverManager.getConnection(dbUrl, dbUserName,
          dbPassword);
          CallableStatement cstmt = connection.prepareCall("{? = call dbo.categoryListing()}");
          //register the stored procedure's output paramater!!!
          cstmt.registerOutParameter(1, java.sql.Types.VARCHAR);
          cstmt.registerOutParameter(2, java.sql.Types.VARCHAR);
          ResultSet rs = cstmt.executeQuery();
          while (rs.next()) {
          categories.put(rs.getString(1), rs.getString(2) );
          rs.close();
          cstmt.close();
          connection.close();
          catch (SQLException e) {  }
          return categories;
          

Answer 1

You might want to look at whether there is any data being fetched from
          the DB. Use some System.out.println()'s in the code where you fetch the
          data from the stored proc.
          Another way might be to comment out the database code, add some dummy
          values into the hastable and make sure that the page comes up as you
          expect.. and then go ahead with the database thingy..
          Nagesh
          dinesh wrote:
          > Thanks, the page is loading up. But, it is just blank. It is not displaying the
          > hastable data. Any ideas?
          >
          > thanks again,
          > Dinesh
          >
          > Nagesh Susarla <[email protected]> wrote:
          >
          >>>Enumeration.categoryIds = categories.keys();
          >>
          >>try replacing the dot '.' with a space and it should be all fine ..
          >>maybe a typo.
          >>
          >>Enumeration categoryIds = categories.keys();
          >>
          >>--
          >>Nagesh
          >>
          >>
          >>dinesh prasad wrote:
          >>
          >>>I get the following error:
          >>>
          >>>C:\bea\user_projects\infologic1\.\myserver\.wlnotdelete\extract\myserver_BibleApp_BibleApp\jsp_servlet\__menu.java:146:
          >>>cannot resolve symbol
          >>>probably occurred due to an error in /menu.jsp line 27:
          >>>Enumeration.categoryIds = categories.keys();
          >>>
          >>>
          >>>code:
          >>>
          >>>menu.jsp
          >>>----------
          >>><%@page import="java.util.*"%>
          >>><jsp:useBean id="DbBean" scope="application" class="showMeItNow.DbBean"/>
          >>>
          >>><%
          >>> String base = (String) application.getAttribute("base");
          >>> %>
          >>>
          >>>
          >>><table width="150" cellpadding="5" height="75" cellspacing="0" border="0">
          >>><tr>
          >>><td>
          >>><form>
          >>><input type="hidden" name="action" value="search">
          >>><input type="text" name="keyword" size="10">
          >>><input type="submit" value="go">
          >>></form>
          >>></td>
          >>></tr>
          >>><tr>
          >>><td>category</td>
          >>></tr>
          >>><tr>
          >>><tr valign="top">
          >>>
          >>> <%
          >>> Hashtable categories = DbBean.getCategories();
          >>> Enumeration.categoryIds = categories.keys();
          >>> while (categoryIds.hasMoreElements()) {
          >>> Object categoryId = categoryIds.nextElement();
          >>> out.println("<a href=" + base + "? action=browseCatalog&categoryId="
          >>>+ categoryId.toString() + ">" + categories.get(categoryId) + "</a><br>");
          >>>}
          >>>
          >>> %>
          >>>-------------------------------------------------------------------------------------
          >>>
          >>>web.xml
          >>><!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application
          >>
          >>2.3//EN"
          >>
          >>>"http://java.sun.com/dtd/web-app_2_3.dtd">
          >>>
          >>><web-app>
          >>>     <servlet>
          >>>          <servlet-name>ControllerServlet</servlet-name>
          >>>          <servlet-class>ControllerServlet</servlet-class>
          >>>     
          >>><init-param>
          >>>     <param-name>base</param-name>
          >>>     <param-value>http://localhost:7001/BibleApp/</param-value>
          >>></init-param>
          >>>
          >>><init-param>
          >>>     <param-name>imageURL</param-name>
          >>>     <param-value>http://localhost:7001/BibleApp/</param-value>
          >>></init-param>
          >>><init-param>
          >>>     <param-name>dbURL</param-name>
          >>>     <param-value>jdbc:weblogic:mssqlserver4:users@COMPAQSERVER</param-value>
          >>
          >>></init-param>
          >>><init-param>
          >>>     <param-name>usernameDbConn</param-name>
          >>>     <param-value>dinesh</param-value>
          >>></init-param>
          >>><init-param>
          >>>     <param-name>passwordDbConn</param-name>
          >>>     <param-value>passs</param-value>
          >>></init-param>
          >>> </servlet>
          >>></web-app>
          >>>     
          >>>          
          >>>-----------------------------------------------------------------------
          >>>DbBean.class
          >>>
          >>>package showMeItNow;
          >>>
          >>>import java.util.*;
          >>>import java.sql.*;
          >>>import showMeItNow.Poll;
          >>>
          >>>public class DbBean {
          >>> public String dbUrl="";
          >>> public String dbUserName="";
          >>> public String dbPassword="";
          >>>
          >>> public void setDbUrl(String url) {
          >>> dbUrl=url;
          >>> }
          >>>
          >>> public void setDbUserName(String userName) {
          >>> dbUserName=userName;
          >>> }
          >>>
          >>> public void setDbPassword(String password) {
          >>> dbPassword=password;
          >>> }
          >>>
          >>> public Hashtable getCategories() {
          >>> Hashtable categories = new Hashtable();
          >>> try
          >>> {
          >>> Connection connection = DriverManager.getConnection(dbUrl,
          >>
          >>dbUserName,
          >>
          >>>dbPassword);
          >>>
          >>> CallableStatement cstmt = connection.prepareCall("{?
          >>
          >>= call dbo.categoryListing()}");
          >>
          >>> //register the stored procedure's output paramater!!!
          >>> cstmt.registerOutParameter(1, java.sql.Types.VARCHAR);
          >>> cstmt.registerOutParameter(2, java.sql.Types.VARCHAR);
          >>> ResultSet rs = cstmt.executeQuery();
          >>> while (rs.next()) {
          >>> categories.put(rs.getString(1), rs.getString(2) );
          >>> }
          >>> rs.close();
          >>> cstmt.close();
          >>> connection.close();
          >>> }
          >>> catch (SQLException e) {  }
          >>> return categories;
          >>> }
          >>>
          >>>}
          >>>
          >>>
          >>>
          >>
          >