Barry,
Thanks for your response. As you see in Chris' notes, it is safer to move
the declaration to local. So instead of
<%! DataSource ds; %>
<%
try {
Context initCtx = new InitialContext();
I tried changing it to
<%
DataSource ds = null;
try {
Context initCtx = new InitialContext();
And it worked OK.
Jason
On Wed, Feb 13, 2008 at 4:51 PM, Propes, Barry L <[EMAIL PROTECTED]>
wrote:
> What is this?
>
> <%! DataSource ds; %>
>
> Do you need that on your page? I never run such a reference on mine. I've
> also imported the following packages -
>
> <%@ page import="javax.naming.Context,javax.naming.InitialContext,
> javax.naming.NamingException,javax.sql.DataSource" %>
>
> My JSP config looks like:
> ----------------------------------------
> Context initCtx = new InitialContext();
> Context envCtx = (Context) initCtx.lookup("java:comp/env");
> // Look up our data source
> DataSource ds = (DataSource)
> envCtx.lookup("jdbc/myoracle");
> // Allocate and use a connection from the pool
> Connection connection = ds.getConnection();
>
>
> -----------------
> and do you have this "DBDevTrackConnDS" set up in your server.xml file --
> either in the context tag or your respective META-INF directory's .xml files
> ?
>
> -----Original Message-----
> From: Jason Ling [mailto:[EMAIL PROTECTED]
> Sent: Wednesday, February 13, 2008 3:40 PM
> To: [email protected]
> Subject: DataSource binding for JSP
>
>
> I have the following jsp file on tomcat 5.5.23. When the file is invoked,
> it only returns the header row of the table (First Name, Last Name, User
> Name, Password), but does not return the expected records from the Oracle
> data table. The entire jsp file is as follows:
>
> <%@ page session="false" %>
> <%@ page import="java.sql.*, javax.sql.*, javax.naming.*, java.io.*,
> java.util.*" %>
>
> <%! DataSource ds; %>
>
> <%
> try {
> Context initCtx = new InitialContext();
> Context envCtx = (Context) initCtx.lookup("java:comp/env");
> ds = (DataSource) envCtx.lookup("jdbc/DBDevTrackConnDS");
> } catch (NamingException e) {
> e.printStackTrace();
> }
> %>
>
> <HTML>
> <HEAD>
> <TITLE>Display All Users</TITLE>
> </HEAD>
> <BODY>
> <CENTER>
> <BR><H2>Displaying All Users</H2>
> <BR>
> <BR>
> <TABLE border="1" cellspacing="0">
> <TR>
> <TH>First Name</TH>
> <TH>Last Name</TH>
> <TH>User Name</TH>
> <TH>Password</TH>
> </TR>
>
> <%
> String sql = "SELECT FirstName, LastName, UserName, Password FROM
> tomcats";
> try {
> Connection con = ds.getConnection();
>
> Statement s = con.createStatement();
> ResultSet rs = s.executeQuery(sql);
>
> while (rs.next()) {
> out.println("<TR>");
> out.println("<TD>" + rs.getString(1) + "</TD>");
> out.println("<TD>" + rs.getString(2) + "</TD>");
> out.println("<TD>" + rs.getString(3) + "</TD>");
> out.println("<TD>" + rs.getString(4) + "</TD>");
> out.println("</TR>");
> }
> rs.close();
> s.close();
> con.close();
> }
> catch (SQLException e) {
> }
> catch (Exception e) {
> }
> %>
>
> </TABLE>
> </CENTER>
> </BODY>
> </HTML>
>
> Checking the log file, the stdout file has the following:
>
> javax.naming.NameNotFoundException: Name jdbc is not bound in this Context
> at org.apache.naming.NamingContext.lookup(NamingContext.java:770)
> at org.apache.naming.NamingContext.lookup(NamingContext.java:153)
> at org.apache.jsp.jsp.dblogin_jsp._jspService(dblogin_jsp.java:55)
> at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
> at org.apache.jasper.servlet.JspServletWrapper.service(
> JspServletWrapper.java:328)
> at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java
> :315)
> at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
> at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
> ApplicationFilterChain.java:269)
> at org.apache.catalina.core.ApplicationFilterChain.doFilter(
> ApplicationFilterChain.java:188)
> at org.apache.catalina.core.StandardWrapperValve.invoke(
> StandardWrapperValve.java:210)
> at org.apache.catalina.core.StandardContextValve.invoke(
> StandardContextValve.java:174)
> at org.apache.catalina.core.StandardHostValve.invoke(
> StandardHostValve.java:127)
> at org.apache.catalina.valves.ErrorReportValve.invoke(
> ErrorReportValve.java:117)
> at org.apache.catalina.core.StandardEngineValve.invoke(
> StandardEngineValve.java:108)
> at org.apache.catalina.connector.CoyoteAdapter.service(
> CoyoteAdapter.java:151)
> at org.apache.coyote.http11.Http11AprProcessor.process(
> Http11AprProcessor.java:834)
> at
> org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process
> (
> Http11AprProtocol.java:640)
> at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java
> :1286)
> at java.lang.Thread.run(Unknown Source)
>
> I have been using the same try{} blocks in my servlet files. The
> connection
> to the same database has always be successful and the data records are
> retrieved. I figure that the only difference between the servlets and the
> jsp is that the servlet has the binding information for the database in
> the
> appName/META-INF/context.xml file:
>
> <Context>
> <Resource name="jdbc/DBDevTrackConnDS"
> auth="Container"
> type="javax.sql.DataSource"
> username="testUser"
> password="testPW"
> driverClassName="oracle.jdbc.driver.OracleDriver"
> url="jdbc:oracle:thin:@sb.lehman.cuny.edu:1521:idm0"
> maxActive="8"
> maxIdle="4" />
> </Context>
>
> and the reference information in the appName/WEB-INF/web.xml file:
>
> <web-app>
> <resource-ref>
> <description>
> Resource refrence to a factory for java.sql.Connection instnaces
> that may be used for talking to a particular database that is
> configured in the server.xml file.
> </description>
> <res-ref-name>
> jdbc/DBDevTrackConnDS
> </res-ref-name>
> <res-type>
> javax.sql.DataSource
> </res-type>
> <res-auth>
> Container
> </res-auth>
> </resource-ref>
>
> What is wrong or missing with the jsp file? Apparently the jsp file is
> not
> aware of the context.xml file and the web.xml file. How do I convey the
> same binding and reference information to the jsp container and the jsp
> page?
>
> Many thanks for helping me out!
>
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