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> What happens if I call a Java method that returns an object of type > not convertible to a Scheme type? For example, All objects are Scheme types. The problem in your example is with #!null - which is not an object. (It is Java null.) Kawa is not fully null-safe. Specifically, global environments do not distinguish between a symbol bound to #!null and an unbound symbol. This is a bug. (However, it is not a bug wrt Scheme conformance, of course, since no portable Scheme code can generate #!null - I hope.) A work-around is to wrap the #!null in a list: #|kawa:10|# (define f (list (gf "Helvetica"))) #|kawa:11|# f (#!null) #|kawa:12|# (car f) #!null #|kawa:13|# --Per Bothner Cygnus Solutions firstname.lastname@example.org http://www.cygnus.com/~bothner