Configuration for JDBC support in Jakarta-Tomcat-4.0

I have used JSP pages which call packaganame.classname in the useBean directive. This works fine when I have simple programs, but when my class uses JDBC connectivity, this does not work. I get NullPointerException on the browser. I am currently using Jakarta-tomcat4.0 web server.
I have added the following entry in the server.xml file for JDBC
connectivity, but it still does not work ...
" <Realm className="org.apache.catalina.realm.JDBCRealm"
debug="99"
driverName="sun.jdbc.odbc.JdbcOdbcDriver"
connectionURL="jdbc:odbc:<DSNName>"
userTable="Parts" userNameCol="<user_name>" userCredCol="<password>"
/>"
Does this support JDBC, if so do I need to do additional configurations
The Database used is Access2000.
Your suggessions would be of great help.

Hi there,
Firstly, check if you have the JDBC driver on the machine that runs Tomcat. You need this to talk to your database.
Secondly, "NullPointerException" can be caused by the connection to the database is not opened yet, make sure your code to open the conn before doing a query to the your database.
Thirdly, from what you stated below it looks like JDBC-ODBC bridge driver instead of pure JDBC driver connectivity.
In conclusion, you should provide more information abt your configuration for us to help you.
$-art

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