Need help using the SQL extension in a servlet.

[Advent Information Systems]

I have an HTTP servlet (under Tomcat under JDK 1.4.2) that uses XSLT 
to transform a request into the appropriate response.  That all works 
fine.

But, I now want to use the SQL extension, and I keep getting the "No 
suitable driver" exception.

Among other things, I've tried using JDK 1.3.1 instead; I've tried 
moving the driver to the JRE extensions directory; I've tried putting 
-Djdbc.drivers=com.sybase.jdbc2.jdbc.SybDriver in the Java command 
line; and none of these seem to make any difference.

Has ANYONE successfully used the SQL extension in a servlet?
Here's the setLogWriter output from java.sql.DriverManager:
DriverManager.initialize: jdbc.drivers = com.sybase.jdbc2.jdbc.SybDriver
DriverManager.Initialize: loading com.sybase.jdbc2.jdbc.SybDriver
JDBC DriverManager initialized
registerDriver: 
driver[className=com.sybase.jdbc2.jdbc.SybDriver,[EMAIL PROTECTED]
registerDriver: 
driver[className=com.sybase.jdbc2.jdbc.SybDriver,[EMAIL PROTECTED]
DriverManager.deregisterDriver: [EMAIL PROTECTED]
DriverManager.getConnection("jdbc:sybase:Tds:202.89.155.78:5000/Orca")
    skipping: 
driver[className=com.sybase.jdbc2.jdbc.SybDriver,[EMAIL PROTECTED]
getConnection: no suitable driver
java.sql.SQLException: No suitable driver
	at java.sql.DriverManager.getConnection(DriverManager.java:532)
	at java.sql.DriverManager.getConnection(DriverManager.java:140)
	at 
org.apache.xalan.lib.sql.DefaultConnectionPool.createConnection(DefaultConnectionPool.java:442)
	at 
org.apache.xalan.lib.sql.DefaultConnectionPool.getConnection(DefaultConnectionPool.java:336)
	at <my code in the servlet, doing a getConnection to test the 
connection pool>
BTW, I have no idea where the deregisterDriver call is coming from. 
Might that be the problem?

TIA for whatever help anyone can give me with this.  I'm basically 
dead in the water until this problem gets fixed.

-- Richard Grossman
   AIS Ltd.