When connecting to DB2 using the JDBC driver, an additional property gets added to the supplied java.util.Properties object.  The property is 'LANGUAGE=C'.  I don't think the DB2 JDBC driver is supposed to alter this parameter.

Hey, some good news about ACL5!  (About time, too.)  ACL5 allows CLOS objects to be patched!  I tried loading a FASL into an image that contained both DEFCLASS and DEFMETHOD, and it worked.