JDBC in tomcat 4 not working

hi
how i can set in tomcat 4 JDBC ?
i have applet->servlet->database
it works in tomcat 3 but not in tomcat 4
what i need wrote in servel.xml and does i need put my jdbc driver in it ???
thanks

Just a guess -- Make sure the classpath to jdbc driver is correct. In Tomcat 4, you may need to set the jdbc classpath in catalina.sh.

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http://help.sap.com/saphelp_nw04/helpdata/en/7e/5df96381ec72468a00815dd80f8b63/content.htm >>>
<i>Adapter Work Method
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(C) Copyright 1985-2001 Microsoft Corp.
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