JNDI lookup problem -> javax.naming...

[Oren andJava]

hi people,

J2EE newbie's writing
I have a problem when I want to do a lookup
I've got this exception :
javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an
application resource file: java.naming.factory.initial

my configuration:
jsdk1.4 j2re1.4.2_05
eclipse 3.0.0 with plugins :quantumDB, LombozJ2EE,Tomcat Launcher
MySQL 4.0.20 as service
Tomcat 5.0.28
all these components are working smoothly

1. I have created a new LombozJ2EE project
2. I added to WEB-INF/lib/web.xml :
<resource-ref>
<res-ref-name>jdbc/sams</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<init-param driver-name="com.mysql.jdbc.Driver"/>
<init-param url="jdbc:mysql://localhost:3306/sams"/>
<res-auth>Container</res-auth>
</resource-ref>
3. I added in Tomcat administration tool a new data source so it will
update <CATALINA_HOME>/conf/server.xml with this new data source
JNDI Name:jdbc/sams
Data Source URL: jdbc:mysql://localhost:3306/sams
JDBC Driver Class: com.mysql.jdbc.Driver
User Name: my username
Password: mypassword
4. I added in src/ two java classes :
- CreateAgency.java for creating the sams's database, it works fine with
driver = "com.mysql.jdbc.Driver";
protocol = "jdbc:mysql://localhost/sams";

- AgencyTable.java to extract the tables with
DataSource dataSource;
InitialContext ic = new InitialContext();
Context ctx = (Context) ic.lookup("java:comp/env");
dataSource = (DataSource)ic.lookup("jdbc/Sams");


5. TOMCAT IS RUNNING, MySQL TOO
I deployed the Webmodule (directories are created in<CATALINA_HOME>/webapps)

I CAN'T HAVE LOOKUP, GOT THE EXCEPTION INSTEAD

if someone could help me

thx

[siva kumar]

in the client project

u have add the the follwing lines in

MANIFEST.MF

Manifest-Version: 1.0
Main-Class: ClientClassName
Class-Path: yourapp.jar


cheers

[Oren andJava]

hi bala

the MANIFEST.MF is not updated automatically whe n deployeing web module ?

how do I make "yourapp.jar" : just making a *.jar of all my workspace? and where to put it (<CATALINA_HOME)/webapps/projectname/) ?
and what should be my "Main-Class: ClientClassName" ? my app has a test.jsp that is calling DBTest.class ....

thx