I am whipping up a new app and the whips have turned against me!

I am using a lot of new (to me) technology and have encountered the
following:

There was 1 error:
1) testConnection(gscc.objectsTest.DBTestInterbase)
java.lang.NoClassDefFoundError: sun/io/ByteToCharConverter
at interbase.interclient.Connection._$m9(Unknown Source)
at interbase.interclient.Connection.<init>(Unknown Source)
at interbase.interclient.Driver.connect(Unknown Source)
at java.sql.DriverManager.getConnection
(DriverManager.java:517)
at java.sql.DriverManager.getConnection
(DriverManager.java:177)
at gscc.objects.impl.DBImpl.connect(DBImpl.java:35)

This is ant invoking java running my app using junit and log4j and
interclient (and each of those whips has barbs on em). The problem
happens in my code when I invoke:

_dbCon = DriverManager.getConnection (_con, aUser, aPassword);

I am using jdk1.3.1 and InterServer-1.60

It appears as if my byte code is funny. This happened yesterday with
an older version of interServer so I think it is within my domain and
not the recent download of InterServer-1.60.

Any thoughts welcomed.

(If launching the Titanic were as painful, it would still be sitting,
safely, in Ireland.)

Bill