> Does Jaybird have any problem if the parameter of
> PrepareStatement.setObject() is a Character class?

It has no problems - you will get an exception (TypeConversionException)

> I can't find anything in the JDBC spec that says this is a problem,
> but since there is no setCharacter() or getCharacter() method I
> didn't know if other dodgy driver implementations might have a
> problem.

java.lang.Char has no corresponding mapping in JDBC data types. If you wish
to support this mapping, you have to invent your own mapping.

Roman