I've written a Web app that works fine under Tomcat
4.1.24. It uses an app-specific Context to set up a
JNDI data source that works fine. It uses the
org.apache.commons.dbcp.BasicDataSourceFactory and the
Oracle 9.2 JDBC type IV thin driver. The Oracle JDBC
driver JAR is in TOMCAT_HOME/common/lib; all other
JARs are in the WEB-INF/lib directory inside the
deployed WAR.

A vendor has shipped s'ware to me that has been tested
under Tomcat 4.0.6. The vendor won't guarantee proper
operation under 4.1.24, because it hasn't been tested
there.

I downloaded 4.0.6, installed it on my machine, put my
app WAR in TOMCAT_HOME/webapps, and put the <Context>
into the server.xml. The Oracle JDBC JARs are in
TOMCAT_HOME/common/lib. I checked the resources page
to make sure that my Context from 4.1.24 was okay for
4.0.6. There were no errors in the log file when I
started up the app. The XML parser accepted the
server.xml without a problem. I got the app log file
that I asked for, and I can see debug info from my
front controller servlet being written to it.

However, as soon as it tries to access the database I
get a "DataSource invalid - no suitable driver" error.

Everything that I gave to 4.0.6 works perfectly under
4.1.24. What common error causes this? I scanned the
Archive link from the mailing list page, but nothing
suitable appeared. Thanks - MOD



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