Problem with JNDI and JSP in Tomcat

Question

Hi,
Basically, what I've done is to use the Tomcat administration web
application to create the DataSource, which looks like it populated the
server.xml (see below). I then try to access the testconn.jsp, and am
getting that "Name java:comp is not bound in this Context" error.
I was wondering if anyone could tell me what I'm doing wrong?
Thanks,
Feri
My Configuration:
- Tomcat 5.0.19
- MySQL 4.0.18-nt
- mysql-connector-java-3.0.15-ga-bin.jar
server.xml:
<GlobalNamingResources>
<!-- Test entry for demonstration purposes -->
<Environment name="simpleValue" type="java.lang.Integer" value="30"/>
<!-- Editable user database that can also be used by
UserDatabaseRealm to authenticate users -->
<Resource name="UserDatabase" auth="Container"
type="org.apache.catalina.UserDatabase"
description="User database that can be updated and saved">
</Resource>
<ResourceParams name="UserDatabase">
<parameter>
<name>factory</name>
<value>org.apache.catalina.users.MemoryUserDatabaseFactory</value>
</parameter>
<parameter>
<name>pathname</name>
<value>conf/tomcat-users.xml</value>
</parameter>
</ResourceParams>
<!--Feri test JNDI-->
     <Context crossContext="true" debug="5" docBase="injury" path="/injury" reloadable="true">
     <Logger className="org.apache.catalina.logger.FileLogger" prefix="localhost_injury_log." suffix=".txt" timestamp="true"/>
          <Resource name="jdbc/injury" auth="Container"
type="javax.sql.DataSource">
</Resource>
<ResourceParams name="jdbc/injury">
     <parameter>
          <name>factory</name>
          <value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
     </parameter>
<parameter>
<name>username</name>
<value>root</value>
</parameter>
<parameter>
<name>password</name>
<value>root</value>
</parameter>
     <parameter>
<name>driverClassName</name>
<value>com.mysql.jdbc.Driver</value>
</parameter>
     <parameter>
<name>url</name>
<value>jdbc:mysql://localhost:3306/injury</value>
</parameter>
     <parameter>
          <name>maxIdle</name>
          <value>30</value>
     </parameter>
     <parameter>
          <name>maxActive</name>
          <value>10</value>
     </parameter>
     <parameter>
          <name>maxWait</name>
          <value>10000</value>
     </parameter>
</ResourceParams>
     </Context>
<!--Feri test JNDI end-->
</GlobalNamingResources>
\webapps\injury\WEB-INF\web.xml:
<resource-ref>
<description>Resource reference to a factory for java.sql.Connection instances that may be used for talking to a particular database that is configured in the server.xml file.</description>
<res-ref-name>jdbc/injury</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
\webapps\injury\testconn.jsp
<%@ page import="java.sql.*" %>
<%@ page import="javax.sql.*" %>
<%@ taglib prefix="ct" uri="/injury" %>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1250">
<h1>Connection test</h1>
<ct:connection name="jdbc/injury">
<%
Statement stmt= conn.createStatement();
ResultSet rs;
rs = stmt.executeQuery("select * from user");
while (rs.next()){
%><%=rs.getString(1)%><%=rs.getInt(2) %><br><%
rs.close();
stmt.close();
%>
</ct:connection>
ConnectionTag.java
import java.io.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
import javax.naming.*;
import javax.sql.*;
import javax.sql.DataSource;
public class ConnectionTag extends TagSupport implements TryCatchFinally {
private Connection conn;
// JNDI name of the connection
private String name;
public void setName(String name)
     this.name = name;
public int doStartTag()
     throws JspException
     try {
     Context env = (Context) new InitialContext().lookup("java:comp/env");
     DataSource ds = (DataSource) env.lookup(name);
     if (ds != null)
          conn = ds.getConnection();
     } catch (Exception e) {
     throw new JspException(e);
     if (conn == null)
     throw new JspException("can't open connection " + name);
     pageContext.setAttribute("conn", conn);
     return EVAL_BODY_INCLUDE;
public void doCatch(Throwable t)
     throws Throwable
     throw t;
public void doFinally()
     try {
     Connection conn = this.conn;
     this.conn = null;
     pageContext.removeAttribute("conn");
     conn.close();
     } catch (Exception e) {
Tomcat 5.0\conf\Catalina\localhost\injury.xml
<?xml version='1.0' encoding='utf-8'?>
<Context displayName="Injury" docBase="E:\Tomcat 5.0\webapps\injury" path="/injury" className="org.apache.catalina.core.StandardContext"
cachingAllowed="true" charsetMapperClass="org.apache.catalina .util.CharsetMapper" cookies="true" crossContext="false" debug="0"
mapperClass="org.apache.catalina.core.StandardContextMapper" useNaming="true" wrapperClass="org.apache.catalina.core.StandardWrapper" >
<Resource auth="Container" description="Resource reference to a factory for java.sql.Connection instances that may be used for talking to a particular database that is configured in the server.xml file." name="jdbc/injury" type="javax.sql.DataSource"/>
<ResourceLink global="jdbc/injury" name="injury" type="javax.sql.DataSource"/>
</Context>

Answer 1

Hi,
First of all, you can find alot of information about this in the forum about jsp's.
I think a good thing to do is not to put your context tag directly into the server.xml file.
What you should do is create a context.xml file with the context-tag in it, and put it in the META-INF directory of your .war file. Upon deployment to tomcat5 this file will be extracted from the war, copied to the conf\enginename\hostname directory, and it will be renamed to contextName.xml.
I think you are developing directly into the webapps directory, and I believe you should avoid that and use the deployment feature of the manager web-app or you should use the deployertool from you ide or standalone ant.
anyway, for starters try to remove the context tag from the server.xml file as described above, and check out the jsp / jdbc forums for simular problems and answers.
good luck