Datasource Configuration problem with Tomcat-4.0.3

Question

Hi All !
When I trying to open connection to my DB2 database in tomcat -4.0.3,
I have put db2java.jar in /usr/local/jakartha-tomcat-4.03/common/lib directory
when I am trying to connect Database through my servlet getting expections
java.lang.NullPointerException: at DataSource ds = (DataSource)envContext.lookup("jdbc/SmsDBDS");
here is my dbconnection class
package com.ebizon.util.jdbc;
import java.sql.*;
import java.util.*;
import javax.naming.*;
import javax.sql.*;
public class DBUtil {
/* Ebizon DB Connection for Tomcat */
public static Connection getEbizDBConnection() throws NamingException, SQLException {
Connection conn = null;
try {
InitialContext initCtx = new InitialContext();
Context envContext = (Context)initContext.lookup("java:/comp/env");
DataSource ds = (DataSource)envContext.lookup("jdbc/SmsDBDS");
conn = ds.getConnection();
} catch (NamingException ne) {
throw ne;
} catch (SQLException se) {
throw se;
return conn;
And my resource definition in server.xml (/usr/local/jakartha-tomcat-4.0.3/conf/server.xml)
<Context path="/DBTest" docBase="DBTest"
debug="5" reloadable="true" crossContext="true">
<Logger className="org.apache.catalina.logger.FileLogger"
prefix="localhost_DBTest_log." suffix=".txt"
timestamp="true"/>
<Resource name="jdbc/SmsDBDS"
auth="Container"
type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/SmsDBDS">
<parameter>
<name>factory</name>
<value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
</parameter>
<parameter>
<name>maxActive</name>
<value>100</value>
</parameter>
<parameter>
<name>maxIdle</name>
<value>30</value>
</parameter>
<parameter>
<name>maxWait</name>
<value>10000</value>
</parameter>
<!-- DB2 dB username and password for dB connections -->
<parameter>
<name>username</name>
<value>smsdb</value>
</parameter>
<parameter>
<name>password</name>
<value>smsdb</value>
</parameter>
<!-- Class name for mm.mysql JDBC driver -->
<parameter>
<name>driverClassName</name>
<value>COM.ibm.db2.jdbc.app.DB2Driver</value>
</parameter>
<parameter>
<name>url</name>
<value>jdbc:db2:smsdb</value>
</parameter>
</ResourceParams>
</Context>
this is my Web Application descriptor /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/EmployeDB
</res-ref-name>
<res-type>
javax.sql.DataSource
</res-type>
<res-auth>
Container
</res-auth>
</resource-ref>
Please look at once above , Do i missing any thing?
Anyhelp is greatly appreciate
Many thanks in advance
With Regards
Madhu Reddy

Answer 1

I don't see any problem with your files, so unfortunately I can't help. Since this forum is about the J2EE SDK, people may not have that much experience with standalone Tomcat. You may want to try the Tomcat user mailing list for a question about Tomcat: http://jakarta.apache.org/site/mail2.html