Would it be possible to add a setLengths(Vector3f v) and/or a setLengths(float x, float y, float z) method to GeomBox? The methods could simply call Ode.dGeomBoxSetLengths(getId(), x, y, z).
Edit:
Similar setters for the other Geom classes would also be useful!
sure, got a patch 
?
Might be a good idea also to document a warning that any geometry that was generated before the change will no longer correctly represent the underlying Geom
Will.
So how do I submit a patch? 
I’ve never done it!
The best way is to use IssueZilla from the odejava project page.
Either submit diff patches or complete changed files (if the latter, make sure they are the most recent you were editing).
Will.