There's no version of Sweet Home 3D bundled with Java under Mac OS X yet (the Download page says: bundled with Java if necessary).
Sweet Home 3D can still work under Mac OS X 10.7 with Java 6 (as I do every day), but miserably, the recent changes Apple made in 2012-006 update seem to cause some issues to a few users (see also this thread).
I recently found a way to make it work with Java 7 / Java 3D 1.6 (not with a perfect look but still it works), so I'll try to release a beta version based on these tools in the coming days.
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Emmanuel Puybaret, Sweet Home 3D creator
