getArgumentFerry(SQLException se) Unpack a SQL exception, looking for an EmbedSQLException which carries
the Derby messageID and args which we will serialize across DRDA so
that the client can reconstitute a SQLException with appropriate text.
Unpack a SQL exception, looking for an EmbedSQLException which carries
the Derby messageID and args which we will serialize across DRDA so
that the client can reconstitute a SQLException with appropriate text.
If we are running JDBC3 or JDBC2, then we hope that the passed-in
exception is already an EmbedSQLException, which carries all the
information we need.