Tomcat - MySQL - Cannot create resource instance

Question

I keep getting an error when trying to lookup my JNDI name. I know that this name is bound to a Context because I can list the bindings
Context initCtx = new InitialContext();
NamingEnumeration enum = initCtx.listBindings("java:comp/env/jdbc");
while (enum.hasMoreElements()) {
System.out.println(enum.nextElement().toString());
And sure enough the name of my database I added through the console appears. However, I keep getting this error:
javax.naming.NamingException: Cannot create resource instance
on this second line of code
Context ctx = new InitialContext();
DataSource ds = (DataSource)ctx.lookup("java:comp/env/jdbc/ArgonautDB");
My MySQL Connector jar file is in $CATALINA_HOME/common/lib and I believe my server.xml settings are correct because I added this Data Source to the context through the console and the web.xml file should be simple...nevertheless I still get this error.
Any suggestions on where I else I can turn. Pulling my precious few last hairs out here....

Answer 1

Thank you very much. That did the trick. Actually what did the trick was to reinstall tomcat with the standard installation, NOT the LE installation which doesn't include the dbcp jar files needed for connecting to a database - but you were right about missing those.
I was dissapointed in Tomcat's documentation of this issue. I would have thought that something that has to have caused other developers problems like this would have been documented somewhere more pronounced (if at all) on Tomcat's site.
For those other newbies out there who don't want to pull out your hair...here is a summary of the steps I took to remedy this problem.
1) Install the latest version of Tomcat. Do NOT install the LE version, it does not include the neccessary library files to connect to a database (commons-dbcp.jar and commons-pool.jar).
2) Download the latest mysql connector library from http://www.mysql.com/downloads/mysqlcc.html. Once you have extracted the tar file, there will be some directories, a README file, a couple other text files and a jar file named mysql-connector-java-VERSION-stable-bin.jar. Move the mysql-connector-java-VERSION-stable-bin.jar file to $CATALINA_HOME/common/lib.
3) Follow the instructions on http://jakarta.apache.org/tomcat/tomcat-4.1-doc/jndi-datasource-examples-howto.html
to create a test database, a test jsp file and a test class to access the database.