I have read through a bunch of posts but I still have not resolved my problem. I am using the jconn2.jar for Sybase ASE 12.5. I have the Class.forName defined as "com.sybase.jdbc2.jdbc.SybDriver" The jconn2.jar is in the correct lib directory of JBoss but I get a ClassNotFoundException for com.sybase.jdbcx.SybDataSource. Who is calling this class out? I see that it is in the jconn2.jar but I don't call it out so I expect that the SybDriver class needs it. What am I missing in the configuration?