Java class bean can not access to DB in JSP file

Hi, I wrote a java class bean in order to access to MySql database ,and this bean is used in a JSP file,so that the bean can query from DB and then display the queried information on the JSP file,but it can not work correctly,the following is the source code and error message popup by the system,
does anybody has experience in solving thus question,Please reply ,Thank you for your help.
%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page import = "java.sql.*" %>
<jsp:useBean id="conn" scope="page" class="news.conn"/>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>1</title>
<style>

</style>
</head>
<body>
<table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="AutoNumber1">
<tr>
<td width="100%">
<img border="0" src="images/ruanjian.jpg" width="770" height="154"></td>
</tr>
<tr>
<td width="100%">@</td>
</tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="AutoNumber2">
<tr>
<td width="13%">@</td>
<td width="87%">
<img border="0" src="images/mid-rdxw2.gif" width="101" height="18"><p>
<%
          ResultSet rs,rsNest;
String strSql=null;
strSql = "select * from news where TYPE=1";
          rs = conn.executeQuery(strSql);
          while (rs.next()){
%>
<span class="s"> <a href="newsContent.jsp?newsId=<%=rs.getInt(id")%">"><%=rs.getString("Title")%></a><br>
<%
%>
<p>
<img border="0" src="images/mid-hyxw2.gif" width="94" height="19"></p>
<%
strSql="select * from news where TYPE=2";
          rs = conn.executeQuery(strSql);
          while (rs.next()){
%>
<span class="s"> <a href="newsContent.jsp?newsId=<%=rs.getInt("id")%>"><%=rs.getString("Title")%></a><br>
<%
%>
<p>@</td>
</tr>
</table>
<p align="center">Study Online</p>
<p align="center">@</p>
</body>
</html>
Error message:
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Exception in JSP: /newsMain.jsp:47
44: strSql = "select * from news where TYPE=1";
45:           rs = conn.executeQuery(strSql);
46:
47:           while (rs.next()){
48:
49: %>
50:
Stacktrace:
     org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:451)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
root cause
java.lang.NullPointerException
     org.apache.jsp.newsMain_jsp._jspService(newsMain_jsp.java:98)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.27 l</a>

nogoodatcoding wrote:
Tolls wrote:
Is that Jasper Exception telling us where the problem is in the jsp, though?
If it is, then "rs" is null in the call rs.next()...which means conn.executeQuery() is returning null. Which means that whatever class conn is (news.conn?) has a problem maybe?That's possible. Though, it may just be the case that the 'conn' object itself is null! That line is the first place where it's being used and there are no checks that I can see...we'll have to wait for the OP to investigate and reply I guess.That's what I originally thought, then I noticed it was saying line 47, which is the rs.next() line. Assuming Jasper is correct in its choice of line, then it's the rs that's null. Which means the conn is doing strange things.
Edit: Now that I think about it, going by the previous thread the OP posted, I'm wondering whether news.conn class is their attempt to move the JDBC stuff out of the JSP page, and it's grabbing the "real" connection (java.sql.Connection) and getting the result set and returning it...or getting something wrong and returning null.
Edited by: Tolls on 11-Jun-2009 12:24

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from the homepage, i am getting the following exception
PortalPersistenceManager: portal 'portal/stockportal' not found
<Feb 20, 2002 12:33:19 PM EST> <Error> <HTTP><[WebAppServletContext(1467076,stockportal,/stockportal)]
Servlet failed with S
ervletException
javax.servlet.ServletException: Received a null Portal object fromthe
PortalManager.
atcom.bea.portal.appflow.servlets.internal.PortalWebflowServlet.setupPortalReq
uest(PortalWebflowServlet.java:194)
atcom.bea.portal.appflow.servlets.internal.PortalWebflowServlet.doGet(PortalWe
bflowServlet.java:99)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
atweblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
:265)
atweblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
:200)
atweblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImp
l.java:241)
atweblogic.servlet.jsp.PageContextImpl.forward(PageContextImpl.java:112)
at jsp_servlet.__index._jspService(__index.java:92)
at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)
atweblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
:265)
atweblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
:200)
atweblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletCo
ntext.java:2495)
atweblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java
:2204)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
even i can not access the admin tools.....i get the follwing errorwhen i
try
to access the portalTools/index.jsp
<Feb 20, 2002 12:38:18 PM EST> <Warning> <Webflow> <Webflow could notresolve
a destination given: appname [tools], namespace
[admin_main], origin [begin], event [defaultEvent] with request id[3121877];
Attempting to load Configuration-error-page.>
<Feb 20, 2002 12:38:18 PM EST> <Error> <Webflow> <Error while parsinguri
/portalTools/application,
path null, query string n
amespace=admin_main - Webflow XML does not exist, is not loaded properly,or you
do not have a configuration-error-page defin
ed.
Exception[com.bea.p13n.appflow.exception.ConfigurationException: The
configuration-error-page>> node was not found in the webfl>> ow xml file. for webapp [tools, namespace [admin_main]. While tryingto
display
CONFIGURATION ERROR: [Exception[com.bea.p13n
appflow.exception.ConfigurationException: Bad Namespace - namespace[admin_main]
is not available for webflow execution. Mak
e sure the [admin_main.wf] file is deployed in webapp [tools].]],]
atcom.bea.p13n.appflow.webflow.internal.WebflowExecutorImpl.processConfigurati
onError(WebflowExecutorImpl.java:786)
atcom.bea.p13n.appflow.webflow.internal.WebflowExecutorImpl.processWebflowRequ
est(WebflowExecutorImpl.java:484)
atcom.bea.p13n.appflow.webflow.internal.WebflowExecutorImpl.processWebflowRequ
est(WebflowExecutorImpl.java:419)
atcom.bea.p13n.appflow.webflow.servlets.internal.WebflowServlet.doGet(WebflowS
ervlet.java:132)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
atweblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
:265)
atweblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
:200)
atweblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImp
l.java:241)
atweblogic.servlet.jsp.PageContextImpl.forward(PageContextImpl.java:112)
at jsp_servlet.__index._jspService(__index.java:92)
at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)
atweblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
:265)
atweblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
:200)
atweblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletCo
ntext.java:2495)
atweblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java
:2204)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
>
Am i missing any step here???
can anybody help me????
thanks
Vijay

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Sorry for my late reply but I want to thank you for your help.
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hope it can help, but should be great know why.
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글 수정: user10649412

When I plug in my Ipod touch to my computer a warning appears "The program cant start because MSVCR80.dll is missing." I can not access my Itunes library. Also, an "error 7 Windows error 126" appears as well. Any ideas?

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