Stuffit .sit/.sitx file expansion?

I've come across a few posts touching on this topic in various places, but none with a definitive answer. I need to expand/decode input streams of mime type "application/x-stuffit" (.sit and .stix) files. Is there a way to do this natively in java?

I see that SmithMicro (maker of Stuffit) has an SDK available (which appears to be just a set of C libraries). Has anyone here integrated these with JNI before? Is this the only way to get at the stuffit-compressed content?