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Tomcat and DataSource

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I checked that there have been numerous questions regarding my problem on this forum. But I didnot find a complete answer on any of them.
I have set up a MS SQLServer JDBC driver datasource on my tomcat 5.0.28 and followed these steps:
1. copy the JDBC Driver's jar into $CATALINA_HOME/common/lib.

2. server.xml configuration
Configure the JNDI DataSource in Tomcat by adding a declaration for your resource to $CATALINA_HOME/conf/server.xml.

3. web.xml configuration
-config in WEB-INF/web.xml

But still get the error
org.apache.commons.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'

Any ideas why?

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