JDBC driver works in ccommand line, not in Tomcat5

Hi Guys,

I'm trying to get Tomcat 5 to  access psql.  I created a "test' database and put several drivers in common/lib.  I keep getting

 

org.postgresql.util.PSQLException: Something unusual has occured to cause the driver to fail. Please report this exception.

in my log  files.  This  same drive worked fine in a test  program I wrote in  the command line program.

 

Does aneone know what might be  happening?

 

Thanks.

Chris